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Cell Phone Shield with Charger
This is the cell phone shield circuit which can be used as mobile charger. Give protection to your cell phone from unexpected use or theft working with this easy circuit. It is able to produce a loud...
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Musical Bell with Touch Switch
Here the circuit diagram of musical bell with touch switch and timer. This circuit is designed around CMOS IC CD4011 which work as the delay timer and IC UM66 which is well-known musical sound...
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1 – 9V Variable Desktop Power Supply
Here the variable desktop power supply which will convert a high input voltage (12V) from the SMPS / PSU of a desktop computer into small output voltage (1.25 to 9 volts). This converter will be very...
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Door Bell with Flashing LEDs
This is the door bell circuit with flashing LEDs to make the circuit more attractive. IC1 (NE555) is applied right here as being a clock generator. It is actually set up as an astable multivibrator...
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Solidstate Automatic Power-Off on Mains Failing
The following schematic diagram is the circuit of solidstate automatic power-off on mains failing. A really good number of circuits which shut down the power to the load on mains failure have...
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Shortwave (SW) Transmitter with IC BEL1895
Here the SW transmitter circuit based on IC BEL1895. This particular transmitter circuit works in shortwave HF band (6 MHz to 15 MHz), and can be applied for shortrange communication and for...
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Notebook Anti Theft Protector
Here the notebook anti theft protector circuit to secure your important netbook / notebook from stealing. Basically, this is a mini security alarm generator. Fixed inside the notebook case, it will...
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Simple Traffic Light Controller
Here the simple traffic light controller which is could be used to educate kids rudiments of traffic light guidelines. The circuit utilizes easily available electronic parts. It generally consists of...
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A Hierachical Priority Encoder
The above diagram is a hierachical priority encoder circuit. Described on wikipedia, priority encoder is a electronic circuit or algorithm that compresses multiple binary inputs into a smaller number...
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Stereo Digital Volume Control
Here is the circuit diagram of stereo digital volume control. This circuit could possibly be applied for upgrading your manual volume management within a stereo amplifier circuit. In this particular...
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Simple Electronic Muscular Stimulator
Here’s a circuit which stimulates nerves of the part of your body exactly where electrodes are generally attached. It is useful to help remedy headache along with muscular discomfort and bring back...
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Water Level Indicator using 7 Segment LED
Here the water-level indicator which use a 7-segment display, to show the water level (low, half and full) in the tank. Moreover, a buzzer is utilized to warn you of water overflowing from the tank....
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Variable / Adjustable DC Power Supply 1.2V – 25V using LM338K
This is variable DC power supply circuit, or we can call it adjustable DC power supply which give us a 1.2V-25V output voltage. The power supply schematic above is taken from the datasheet of...
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Light Fence with LDR
This is the light fence schematic diagram uses LDR as the light sensing. The fundamental issue with the greater part of standard light sensors is that they require exact arrangement of light bar to...
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Simple Sensitive Tester for Infrared (IR) Remote Control
This kind of circuit is a helpful device for testing of infrared (IR) based remote control transmitters utilized for TVs and VCRs and so forth. The IR motions from a remote control transmitter are...
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Simple Mat Alarm Switch
This easy to built circuit produces a warning beep when somebody crosses a secure area in your home or place of work. The transfer, hidden beneath the ground mat, causes the alarm whilst the...
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Infrared (IR) Cordless Headphone
This is the schematic diagram of Infrared (IR) cordless headphone. Maybe it also can be called “wireless headphone”, but it use infrared as sound signal carrier. It use a pair of circuit diagrams that...
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Stage Center Reverb Guitar Effect
This is the simple spring reverb guitar effect circuit that can be built low cost and just requires a minimal amount of electronic parts and of course need minimum space for the circuit it self. The...
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Electronic Appliance Protector
This is a easy built and very low-cost circuit purposed to protect your electronic appliances / devices, such as Personal Computer, TV, recording devices, refrigerator, and other devices during sudden...
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2KM Long Range FM Radio Transmitter
This long-range FM radio transmitter has an additional RF power amplifier stage, after the oscillator stage. The extra RF power amplifier used to strenght up the power output to become 200-250...
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