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Popular Posts

Simple NiCd Battery Charger

A simple NiCd charger can be built using ‘junk box’ components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter c...
Cash Box Guard

Most thefts happen after midnight when people enter the second phase of sleep called 'paradoxical sleep.' Here is a smart security c...
Simple AM Transmitter

There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. Ther...
Cat And Dog Repellent

The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and c...
SDR Soundcard Tester

The key to using a soundcard successfully in digital signal processing or digital radio applications lies principally in the characteristics...
Car Temperature Gauge

The Car Temperature Gauge is basically the same circuit as March's project with some minor changes to the input circuit. This circuit wi...
Video Amplifier

The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can ...
Touch-Select Audio Source

Often you need to connect output from more than one source (preamplifier) such as tape recorder/player and CD (compact disc) player to audio...
555 DC/DC Converter

It is all too often necessary to augment the power supply of an existing electronic circuit because exactly the voltage that you need is mi...
Generation of 1-Sec Pulses Spaced 5-Sec Apart

This circuit using a dual-timer NE556 can produce 1Hz pulses spaced 5 seconds apart, either manually or automatically. IC NE556 comprises tw...

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Big Hits

Simple NiCd Battery Charger

A simple NiCd charger can be built using ‘junk box’ components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter c...
Cash Box Guard

Most thefts happen after midnight when people enter the second phase of sleep called 'paradoxical sleep.' Here is a smart security c...
Simple AM Transmitter

There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. Ther...
Cat And Dog Repellent

The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and c...
SDR Soundcard Tester

The key to using a soundcard successfully in digital signal processing or digital radio applications lies principally in the characteristics...
Car Temperature Gauge

The Car Temperature Gauge is basically the same circuit as March's project with some minor changes to the input circuit. This circuit wi...
Video Amplifier

The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can ...
Touch-Select Audio Source

Often you need to connect output from more than one source (preamplifier) such as tape recorder/player and CD (compact disc) player to audio...
555 DC/DC Converter

It is all too often necessary to augment the power supply of an existing electronic circuit because exactly the voltage that you need is mi...
Generation of 1-Sec Pulses Spaced 5-Sec Apart

This circuit using a dual-timer NE556 can produce 1Hz pulses spaced 5 seconds apart, either manually or automatically. IC NE556 comprises tw...

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