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Miscellaneous electronic circuits

Miscellaneous electronics circuits

7 Segment LED Counter

This simple counter can be used to count pulses... [read]

Doorbell for the Deaf

This circuit provides a delayed visual indication when a door bell switch is pressed. Very helpful for deaf people.... [read]

High Quality Intercom

A very high quality intercom, which may also be used for room monitoring... [read]

High Voltage Stun Gun

High Voltage Stun Gun. It's not a toy!... [read]

Insect Repellant

22kHz oscillator which produces sound that should repel insect. It has adjustable frequency. Its built around one CMOS 4047 circuit. ... [read]

IR Remote Control Jammer

Don't like your little brother's TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone? This circuit does all that... [read]

Keys Finder

Imagine that is morning , you barely anticipate the bus for work and you can't find your keys. If you suffer from this situation frequently, this circuit is... [read]

Magic Wand Conjuring Trick

This is circuit diagram of an interesting toy. It lights up if You move "magic wand" over it in the precisely right way that only you know!... [read]

Magnetic Gun

This little gun can propel a small slug about 1.5 meters high, or 2.5 meters horizontally. It produces magnetic field using four coils and 4017b and NE555... [read]

Muscular Bio-Stimulator

This is a small, portable set, designed for those aiming at look improvement. The Bio-Stimulator provides muscles' stimulation and invigoration but, mainly,... [read]

Muscular Bio-Stimulator

This is a small, portable set, designed for those aiming at look improvement. The Bio-Stimulator provides muscles' stimulation and invigoration but, mainly,... [read]

Nocturnal Animals Whisker

This circuit proved very useful in keeping away from a terrace or a porch some bats and other nocturnal animals. You can use it for similar or different purposes.... [read]

Sleeping-Aid

Many people experienced sleeping well in natural surroundings, into a tent or a wooden hut. This fact is due not only to the healthy atmosphere but also from... [read]

Sound Effects Generator

This circuit uses a UM3561 IC to produce four different sound effects... [read]

Ultrasonic Dog Whistle

One more circuit with famous NE555 timer circuit. This one produces ultrasound which can be heard by many animals. It's built to be "loud".... [read]

Voltage follower with 1G ohm input resistance

This circuit uses an LM11 to form a voltage follower with 1G ohm input resistance built using standard resistor values.... [read]

Whistle Responder

This device beeps intermittently for approx. two seconds when a person in a range of about 10 meters emits a whistle.... [read]

Whistle Responder

Beeps when hears your whistle. A gadget suitable for key-holders, games etc. ... [read]