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This is the circuit diagram of 5VDC single polarity to 12VDC dual polarity converter based on IC LM2595-12 from National Semiconductor. This circuit will convert 5V DC single voltage (+) become 12V DC dual polarity output (+), GND, (-).

Many electronic devices need a ±12V power supply. Typical examples include analog circuits or RS-232 driver power supplies. The ±12V typically needs to be generated from a 5V system bus. The solutions normally used involve a multiple secondary transformer or multiple switching regulators. These solutions can be complicated, may require custom transformer design and may have poor efficiency and poor regulation. The 5VDC single polarity to 12VDC dual polarity converter circuit shown in above image is simple, uses only one switching regulator IC, uses a small number of components, and provides good regulation at a high efficiency. Additionally, all the components used in this circuit are off the shelf components.

The converter circuit in above image uses an LM2595-12 (buck SIMPLE SWITCHER™) based switching regulator to generate both the +12V and the -12V outputs from 5V input. The LM2595 is configured as an inverting buck-boost converter to obtain the negative output. The positive output is generated using an additional winding in the off-the-self inductor (CTX250-4 from Coiltronics) used in this circuit. Only one additional diode (D3) and a capacitor (C3) are needed to generate the positive output.

This circuit come from Application Note #1118 by National Semiconductor about Simple Regulator Provides ±12V from 5V Source using LM2595-12.
Download the application note AN-1118:

AN-1118 - 5V to 12V DC Converter 51.89 KB

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This is a small 12W audio amplifier over a load of 8 Ω, that combining the NE5534 integrated with a pair of V-MOSFET transistor output stage technology as we get excellent sound performance. MOSFET 2SK135 / 2SJ50 from Hitachi is used in this circuit. Input sensitivity of the circuit is 3V RMS maximum, the distortion factor is 0.002% at 1 kHz, and the frequency response is 15 Hz to 100 kHz. (-3dB).

This circuit requires a symmetrical (dual polarity) power supply with voltage output +/- 25V and the current output should be 2A maximum.

12W Audio Amplifier Components List:

R1 = 33 kΩ	C1 = 1nF 63V	D1 = 1N967B zener 18V 0.5W
R2 = 6.8 kΩ	C2 = 47 µF 40V	D2 = 1N967B zener 18V 0.5W
R3 = 22 kΩ	C3 = 100 nF 63V	D3 = 1N4148
R4 = 100 kΩ	C4 = 100 nF 63V	D4 = 1N4148
R5 = 1 kΩ	C5 = 47 µF 40V	Q1 = 2SK135 MOSFET
R6 = 330 Ω	C6 = 4.7 pF ceramic	Q2 = 2SJ50 MOSFET
R7 = 1 kΩ	C7 = 100 µF 40V	IC1 = NE5534
R8 = 10 kΩ	C8 = 100 µF 40V
R9 = 0.47 Ω 2W
R10 = 0.47 Ω 2W
R11 = 10 kΩ

Power Supply Specification:
Voltage: Symmetrical 25V
Current : 1A – 2A Max

MOSFET 2SK135 and 2SJ50 Datasheet Downloads:

SK133, SK134, SK135 Datasheet 192.12 KB

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2SJ48, 2SJ49, 2SJ50 Datasheet 193.15 KB

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This is the circuit connection of home telephone call recorder that uses very few components. In order to understand its working, we must first have the basic knowledge of standard telephone wiring and a stereo plug. In some countries, landline telephones primarily use RJ11 wiring, which has two wires—tip and ring. While tip is the positive wire, ring is the negative one. And together they complete the telephone circuit. In a telephone line, voltage between tip and ring is around 48V DC when handset is on the cradle (idle line). In order to ring the phone for an incoming call, a 20Hz AC current of around 90V is superimposed over the DC voltage already present in the idle line.

The negative wire from the phone line goes to IN1, while the positive wire goes to IN2. Further, the negative wire from OUT1 and the positive wire from OUT2 are connected to the phone. All the resistors used are 0.25W carbon film resistors and all the capacitors used are rated for 250V or more. The negative terminal of “To AUX IN” is connected to pin 1 of the stereo jack while the positive terminal is connected to pins 2 and 3 of the stereo jack. This stereo jack, in turn, is connected to the AUX IN / Audio Input of any recording device, such as computer, audio cassette player, CD player, DVD player, etc. In this case, we will use a computer desktop / notebook to make a call record.

When a call comes in, around 90V AC current at 20Hz is superimposed over the DC voltage already present in the idle line. This current is converted into DC by the diodes and fed to resistor R1, which reduces its magnitude and feeds it to LED1. The current is further reduced in magnitude by the resistor R2 and fed to the right and left channels of the stereo jack, which are connected to the AUX IN / Audio In port of a computer, in most of notebook devices, it is same between Audio Input / Mic Input.

Any audio recording software can be used to record the home telephone call, i.e AVS Audio Editor, Audacity Audio Recorder, or Audio Recorder for Free. When a call comes in, one needs to launch the audio recording software and start recording.

For phone recording, simply connect the stereo jack to the “audio input” or “mic input” port of the PC/Notebook. Install the audio recorder software on your PC/Notebook. Run the software and check the setting to ensure that the input is correct. Now you are ready to record any call. As soon as a call comes in, press the record button on the software and then pick up the telephone receiver and answer the call. Press the stop button once the call ends and then save the file in a desired location. Each software may has different setting, you can read the manual of each software about how to record an audio.

You may change the value of resistor R2 if you want to change the output volume. You can use a variable resistor in series with R2 to vary the volume of the output the home telephone call recorder circuit. The recorded audio clip can be edited using different options in the Audio Recorder software.

You can built the circuit on a general-purpose PCB and enclose it in a small box. Use an RJ11 connector and stereo jack for connecting the telephone set and computer desktop/laptop (for call recording). Telephone cords can be used to connect to the phone line and the home telephone call recorder circuit. Use of a shielded cable is recommended to reduce disturbances in the recording so it we will get good audio performance from the recording. These disturbances can also be reduced by increasing the value of R2 to about 15K.

This circuit was tested, come from EFY mag, Dec 2009. Download the PDF version:

Home Telephone Call Recorder Circuit Project 246.37 KB

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This is the electronic bicycle directional lights circuit that use inexpensive components and is a good substitute to many commercially available versions in the marketplace. This circuit works in an extremely different manner and is convenient to operate.

The bicycle direction indicators circuit works off a 9V PP3 (alkaline-type) battery and is basically a set of two independent free-running oscillators (astable multivibrators) built around four low-power transistors and a few passive components. Both the square-wave oscillators (one built around T1 and T2 and the other built around T3 and T4) drive four red LEDs (LED1 and LED2, and LED5 and LED6, respectively), which blink to indicate the direction of turn. Additional steady-glow LEDs (LED3 and LED4) are incorporated to indicate the working status.

How the Bicycle Directional Signal Lights Works

When switch S1 is flipped to “on” position, DC supply from the battery is extended to the oscillator circuit formed by transistors T1 and T2. Now the left-side oscillator starts oscillating and the visual indicators at the front left (FL) and rear left (RL) start blinking at a rate determined by timing capacitors C1 and C2. Resistors R2 and R3 limit the operating current of LEDs (LED1 and LED2). At the same time, the green LED (LED3) starts glowing to indicate the present direction status.

Similar action happens in the next oscillator circuit built around transistors T3 and T4 when switch S2 is flipped to “on” position. Indicators at the front right (FR) and rear right (RR) start blinking, and at the same time the green LED (LED4) glows to indicate the direction status.

Switch S3 is used for emergency indication. When it is flipped to “on” position, both the oscillators get power supply through diodes D1 and D2. As a result, LED1 through LED6 start working simultaneously. In this condition, all the LEDs blink, except LED3 and LED4, which glow steadily.

Bicycle Directional Lights Assembly

After assembling the circuit on a general purpose PCB, enclose it in a suitable cabinet as shown the following image and mount on the handle bar of the bicycle, preferably at the mechanical centre point.

Connect switch S1 at the left-hand side, S2 at the right-hand side and emergency switch S3 in the middle of the master unit. Now place this master unit at the top of the handle bar and do the essential interconnections using flexible wires. Connect the front indicators (LED1 and LED5) to the left and right side of the handle and similarly rear indicators (LED2 and LED6) can be mounted in the carrier frame of the bicycle.

For the direction indicator, you can use the direction symbol and place it at the centre of the handle, look at above image for reference.

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This is the glow plug control module unit to raise the air temperature inside the engine cylinder for quick and reliable starting, to extend the battery life and reduce the diesel consumption. In diesel engines, the air in the cylinders is not hot enough to ignite the fuel under cold conditions. Therefore every cylinder of these engines is fitted with an electric heater known as “glow plug”. A control module circuit is important to optimise the functioning of glow plugs.

How the Glow Plug Control Module Works

It utilizes a simple timer circuit built around MOSFET T1 for reliability and simplicity. Momentary pushing of switch S2 charges capacitor C1 rapidly via resistor R1. When the voltage on capacitor C1 exceeds the threshold voltage of the gate (G) of MOSFET T1, it starts charging reservoir capacitor C2 and simultaneously energises relay RL1. MOSFET T1 remains conducting as long as the voltage on C1 is greater than the threshold voltage of the MOSFET gate.

The “on” time period depends on the value of capacitor C1 and resistor R2, which govern the discharge current of capacitor C2. The component values given here will produce “on” time of around 25 seconds. In effect, when you press switch S2 momentarily, the relay energises for about 25 seconds and the glow plug gets the power supply through its contact.

The red LED (LED1) indicates that the heating process of glow plugs is “on”. When the “on” time is over, the green LED (LED2) turns on for a while, followed by a short beep from the buzzer, which indicates that the engine is ready for starting. Glow plugs draw a heavy current, hence high-current-rating contacts of an automotive relay are needed.

Build the glow plug control module unit on any general purpose PCB and mount it in a suitable case/box. Connect the glow plug wire to the relay contact. The 12V battery source that already available with the vehicle can be used to power the circuit. Connect the piezobuzzer and LED1 and LED2 through an external connection and place it at a convenient location for the driver to work.

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This is the circuit design of the protector for electronic appliance with three-phase power supply. Many of electronic appliances need three-phase AC supply to work. If there is any failure of any of the phases, then it will make the appliance prone to erratic functioning and may even lead to failure. Hence it is of paramount importance to monitor the availability of the three-phase supply and switch off the electronic appliance if found any failure on one or two phases. The power to the appliance should resume with the availability of all phases of the supply with certain time delay in order to avoid surges and momentary fluctuations.

The electronic appliance protector needs three-phase AC power, three 12V relays and a timer IC NE555 along with 230V coil contactor having four poles to switch on and switch off the appliance.

How the protector circuit works

Relays RL1 and RL2 act as a sensing devices for phases Y (Yellow) and B (Blue), respectively. These relays are connected such that each acts as an enabling device for the subsequent relay. Therefore the combination of the relays forms a logical AND gate connected serially.

The availability of phase R (Red) energises relay RL1 and its normally opened (N/O) contacts close to connect phase Y to the input of transformer X2. The availability of phase Y energises relay RL2 and its N/O contacts close to connect phase B to the input of transformer X3, thus applying a triggering input to timer IC NE555 (IC1).

Therefore the delay timer built around NE555 triggers only when all the phases (R, Y and B) are available. It provides a delay of approximately four seconds, which energises relay RL3 and its N/O contact closes to connect the line to the energising coil of four-pole contactor relay RL4. Contactor RL4 closes to ensure the availability of the three-phase power supply to the appliance.

The rating of contactor RL4 can be selected according to the full-load current rating of the appliances. Here the contact current rating of the four-pole contactor is up to 32A. The availability of phases R, Y and B is monitored by appropriate LEDs connected across the secondary windings of transformers X1, X2 and X3, respectively. Hence this circuit does not require a separate indicator lamp for monitoring the availability of the three phases. When phase R is available, LED1 glows. When phase Y is available, LED2 glows. When phase B is available, LED3 glows.

The main advantage of this protector circuit is that it protects three-phase appliances from failure of any of the mounted on the backside of cabinet. Connect the appliance through external wires.

WARNING: The circuit contains mains high voltage. Make sure the AC mains is disconnected during assembly of the circuit and double check everything before connecting your circuit to the AC mains.

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Here the circuit design of vibration sensor alarm. Initially, when power switch S1 is flipped to “on” position, power indicator LED1 lights up immediately. IC LM555 (IC1), wired as a simple latch circuit with control input, is powered and R-C components R4 and C5 connected at its reset pin 4 force the latch to standby mode (with inactive low output). The circuit is driven into sleep mode.

As soon as vibration is detected, MOSFET T1 is fired by the positive-going pulse output from the vibration sensing mechanism built around piezo-ceramic wafer and associated components. As a result, control input pins 2 and 6 of IC1 latch are grounded. Output pin 3 of IC1 now goes high. The positive supply from output pin 3 of IC1 is extended to three-tone siren generator UM3561 (IC2) through R5, D1 and R6. Components R6 and ZD1 stabilise the input power supply of IC2 to around 3.3V. Output signals from IC2 are amplified by Darlington-pair transistors T2 and T3 to produce alert tone (police siren sound) via loudspeaker LS1.

Reset switch S1 can be used to switch off the alarm sound by resetting the latch circuit. For safety, use key-lock type switches for S1 and S2. A relay can also be connected at the output socket (SOC1) of the circuit to energise high power beacons, emergency sirens and fence electrification units.

The smart vibration sensor alarm circuit powered with a 9V DC power supply. A compact PP3-/6F22-type alkaline battery can be used to power the circuit.

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Here is the DIY electronic cardlock security system that can be used as a lock to turn on dan turn off important electronic/electrical appliances. When card is inserted, depending upon the position of punched hole on the card, a particular appliance would be switched on. The card should be rectangular in shape with only one punched hole on it. Unused/broken card (ie expired credit card, student card etc) can be used for this circuit.

How The Cardlock Security System Works

The electronic cardlock security system circuit uses eight photo-transistors (T1 through T8) to sense the light. When there is no card in the lock, light from incandescent lamp L1 (40-watt, 230V) falls on all the photo- transistor detectors. Transistor T8 is used as enable detector for IC1 (74LS244). When light is incident on it, it conducts and its collector voltage goes low. This makes transistor T16 to cut-off, and its collector voltage goes high. This logic high on its collector terminal will inhibit IC1 as long as light is present on phototransistor T8.

IC1 will get enabled only when the card is completely inserted inside the lock mechanism. This arrangement ensures that only the selected appliance is switched on and prevents false operation of the system.

You can make these cards using a black, opaque plastic sheet. A small rectangular notch is made on this card to indicate proper direction for insertion of the card. If an attempt is made to insert the card wrongly, it will not go completely inside the mechanism and the system will not be enabled.

When card for any appliance (say appliance 1) is completely inserted in the mechanism, the light will fall only on photo-transistor T1. So only T1 will be on and other photo-transistors will be in off state. When transistor T1 is on, its collector voltage falls, making transistor T9 to cut-off. As a result, collector voltage of transistor T9 as also pin 2 of IC1 go logic high. This causes pin 18 (output Q1) also to go high, switching LED1 on. Simultaneously, output Q1 is connected to pin 1 of IC2 (ULN2003) for driving the relay corresponding to appliance 1. Similarly, if card for appliance 2 is inserted, only output pin 16 (Q2) of IC1 will go highmaking LED2 on while at the same time energising relay for appliance 2 via ULN2003. The same is true for other cases/appliances also.

The time during which card is present inside the mechanism, the system generates musical tone. This is achieved with the help of diodes D1 through D7 which provide a wired-OR connection at their common-cathode junction. When any of the outputs of IC1 is logic high, the commoncathode junction of diodes D1 through D7 also goes logic high, enabling IC3 (UM66) to generate a musical tone.

In this electronic cardlock security system circuit IC1 (74LS244) is used as buffer with Schmitt trigger. All outputs (Q1 through Q7) of this IC are connected to IC2 (ULN2003) which is used as relay driver. IC2 consists of seven high current relay drivers having integral diodes. External free-wheeling diodes are therefore not required.

When an input of this IC is made logic high, the corresponding output will go logic low and relay connected to that pin gets energised. This switches on a specific appliance and the corresponding LED.

Once a specific card is inserted to switch on a specific relay, that relay gets latched through its second pair of contacts. Thus even when the card is removed, the specific appliance remains on. The same holds true for all other relays/appliances as well. The only way to deenergise a latched relay after removal of the corresponding card is to switch off the corresponding switch (S1 through S7) which would cut-off the supply to the desired relay.

The +5V and +12V supplies can be obtained with conventional arrangement using a step-down transformer followed by rectifier, filter and regulator (using 7805 and 7812 etc), you may find the circuit design on power supply category.

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This 6V and 12V car battery charger circuit can be automatically charged, quickly and correctly, 6V and 12V batteries. Circuit design is divided into two series of modules that are: power supply module and the main charger module containing the regulator modules and direct current amplifier module.

How the 6V and 12V Car Battery Charger Works

A key factor in the success of the operation of the circuit is the use of good quality transformer [T1]  with very good insulation and resistance to short circuits. The Q1 through divider R1-2, of TR1 and R4, functions as a regulated current source. The current through R9 drives power transistors Q5-6, where amplified approximately x2000 times. In an unloaded car battery voltage is about 6V to 8V. With these conditions, the charge current is about 1.2A [regulated by TR1]. When the battery is charging slowly, gradually increases the voltage at its ends. 7V to enter into the D1 conducts. As the battery voltage increases, the voltage decreases at the ends of R3 Q1 made the most conductive. This continues until the current reaches about 6A. Then by means of the voltage drop across R10, is made conductive to Q4. The excess current to the base of Q5 to ground, keeping the load current constant. When the battery is fully charged [14.4V] activated in parallel to the circuit battery, consisting of R6, D8, D2 to D6. At the same time illuminates the D8 indicating that the battery has been fully charged. Simultaneously Q2 is conducting because the voltage drop on R6. The Q3 is conductive and grounded part of the stream at the base of Q5. When the voltage across the battery reaches approximately 15V current at the base of Q5 is very small, so to stop charging the battery. Diodes D5-6 protect the circuit from accidentally installing the battery or short circuits of long duration. The diode D4 protects the circuit from wrong positioning of the battery terminals. Then D9 Led lights showing connection error [ERROR]. Closing switch S2 short the diode D2 [6.8V], now we can charge 6V battery.

6V and 12V Car Battery Charger Component List

6V and 12V Car Battery Charger  Adjustment

The initial charge current should be adjusted via the TR1 to 1.2A. The adjustment can be done with a 6V battery. Connect in series with the battery a current [maximum 10A]. If there is 6V battery is short-circuited through the ammeter the charger terminals and adjust the TR1 current to 1.2A. When setting the switch S2 should be in the position of 12V, i.e. open. Particular attention should be paid to the accuracy of the diodes D2 and D3 because they protect the battery from overcharging. If the differential voltage is 100mV to go to consider them as acceptable. If you encounter difficulties in the current setting and the TR1 is not enough, you can change the value of the resistor R4, to measure charge current 1.2A. The two parallel resistors constituting R10, should be placed at a distance from the printed and Q5-6, because heated. The bridge B1 and Q5-6 be mounted on heatsink having insulated electrically from this with suitable mica silicone. The bridge B1 and the board in which the circuit is mounted must be connected with short and thick cables, especially where the current is large. lines are also printed on must have the appropriate width [in the project are shown in thicker line]. The construction should be done in a nice metal box, suitable dimensions so there is good ventilation. The construction requires the expertise.

WORK WITH BATTERIES REQUIRE HIGH ATTENTION IN HANDLING BECAUSE THERE IS ALWAYS A RISK OF EXPLOSION.

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Here is the simple and low cost mosquito repellent circuit design. The circuit serves to keep the mosquitoes out of the room or the location where the device is installed. According to certain publications, the frequency emitted by the male mosquitoes is said to be around 20–25 kHz, and so within the realm of ultrasound. But according to others, it is in the region of 5–7 kHz instead; frequencies that a human ear, even an elderly one, can still hear very well. Rather than spending lots of money buying such a device, which moreover generally have a fixed frequency, we’re suggesting building one yourself , especially since the circuit proposed is very simple and cheap to build.

Mosquito Repellent Works

The low cost mosquito repellent circuit uses just a single IC, a CMOS type 4047. This very multi-purpose IC can be wired in very many operating modes, including that of the multivibrator or astable used here. The operating frequency is set by the external components C1, R1, and P1. The latter makes it possible to slightly adjust the frequency, given the uncertainty that exists over the most efective value. To best reproduce the high frequencies produced by the generator, the output transducer used is a simple tweeter, but it must be a piezo one. Such a tweeter behaves in fact much like a capacitor, and so doesn’t overload the CMOS IC outputs that are incapable of supplying a substantial current.

To obtain an output signal of sufficient amplitude while being powered from a single 9 V battery. The tweeter is connected between the 4047’s Q and Q outputs. With this condition, it possible to apply complementary (antiphase) signals to the tweeter so it ‘sees’ an alternating voltage of double the supply voltage. In purely theoretical terms, this quadruples the output power available. In practice, it’s better to regard it as tripling it, but the beneft achieved by doing it this way is nonetheless very real. All that remains is for you to place the project in the middle of the patio table or beside your lounger in order to get a taste of the calm of a summer’s evening without mosquitoes bothering you acoustically or worse, biting. At any rate, that’s what we wish for you.

Source: eeweb

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This is the simple and low cost pulse width modulation – PWM DC motor controller using a MOSFET. This kind connection for DC motor control is to prevent heat and minimize the power consumption. It controls the motor speed by driving the motor with short pulses. These pulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor turns, and vice versa.

PWM DC Motor Controller Component List

• R1 1 Meg 1/4W Resistor
• R2 100K Potensiometer
• C1 0.1uF 25V Ceramic Disc Capacitor
• C2 0.01uF 25V Ceramic Disc Capacitor
• Q1 IRF511 MOSFET or IRF620
• U1 4011 CMOS NAND Gate
• S1 DPDT Switch
• M1 Motor (See circuit notes)
• MISC Case, Board, Heatsink, Knob For R2, Socket For U1

PWM DC Motor Controller Circuit Notes

• R2 potensiometer to vary the speed of the oscillator and therefore the speed of M1.
• M1 can be any DC motor that operates from 6V and does not draw more than the maximum current of Q1. The voltage can be increased by connecting the higher voltage to the switch instead of the 6V that powers the oscillator. Be sure not to exceed the power rating of Q1 if you do this.
• Mount a heatsink on Q1 MOSFET.
• Q1 in the parts list can handle a maximum of 5A. Use the IRF620 for 6A, if you need any higher.

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This sine wave to square wave converter circuit is expected to provide good square waves changing a sine wave delivered from an existing generator. Its primary feature consists in the fact that no power-source is required: in this manner it can be simply connected between a sine wave generator and the device under test.

The input sine wave sustains a voltage doubler formed by C1, C2, D1 & D2 that powers the IC. IC1A amplifies the input sine wave, other inverters included in IC1 squaring the signal and delivering an output square wave of equal mark/space ratio and good rise and fall times through the entire 20Hz-20KHz range.

Sine Wave to Square Wave Converter Circuit Notes:

• Minimum sine wave input amplitude needed for good performance: 750mV RMS.
• Best performances are obtained with an input sine wave amplitude from 1V RMS onwards.
• Output square wave amplitude is proportional to input amplitude.
• Output square wave amplitude with 1V RMS input: 3V peak to peak, with R2 set at max.
• Minimum output square wave amplitude: 2V peak to peak, with R2 set at max.
• Substituting the two silicon diodes with germanium types (e.g. AA118, AA119), the minimum input threshold can be lowered.

This sine wave to square wave converter come from redcircuits.com

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After we present a circuit of electronic mosquito repellent, this time will be continued with a circuit of electronics that are not less interesting, that is electronic rat repellent circuit.

Actually the working principles of electronic mosquito repellent and mice repellent are exactly same, using echolocation disliked by both the animal. As we know, both types of animals are very distracting while in our house.

This electronic rat repellent circuit is very simple since it only uses a few different types of components. So for you who is currently studying, studying electronics, can try to practice makes this circuit because it is considered easier for beginners.

Just the information that the necessary components to built this circuit are very less, approximately less than 10 components. So it could be ascertained that the estimation of the price needed to make this series less than 5 bucks. Very suitable for beginners who want to practice making an electronic circuit.

The required components are the basic components such as resistors, capacitors, transistors, IC 555, and output in the form of the speaker. So this is the speaker who can issue echolocation with a sweep of 50 Hz. The voice is the voice of the hated rats, so mice won’t dare draw near.

You do not need to worry because these sounds will not disturb your sleep. This sound will be loud in the ears of mice, but not for the human ear.

Electronic Rat Repellent Component List

• R1: resistor 1K8
• R2: resistor 1K
• R3: resistor 5K6
• R4: resistor 480R
• C1: capacitor 2,2nF
• C2: capacitor 0,022uF/6V
• IC: timer 555Q: SC1162
• Speaker: 4 ohm

Hopefully the electronic circuits is beneficial to all readers, please share via social media.

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