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Miscellaneous - list of circuit diagrams

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Laser Communication System circuit diagram
This is a simple Laser communication system. It can transmit and receive signal from any audio device.

author: Marin Lukas - Croatia
visits: 66
Decimal to BCD Convertor circuit diagram
This circuit will provide an output in Binary Coded Decimal from any of the input switches. The input switches may be expanded to 16 switches, providing a Hexadecimal to BCD conversion

author: Ron J
visits: 61
Insect Repellant circuit diagram
the circuit consists of a phase locked loop (CMOS 4047) wired as a 22KHz oscillator

author: Graham Maynard and Andy Collinson
visits: 57
Doorbell for the Deaf circuit diagram
This circuit provides a delayed visual indication when a door bell switch is pressed

author: Andy Collinson
visits: 53
Audio Indicator circuit diagram
This circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence of an audio waveform. It can also be directly connected across loudspeaker terminals used as a peak indicator

author: Andy Collinson
visits: 50
Combinational Conjuring Trick circuit diagram
The simple circuit emulates a similar conjuring trick which sells for hundreds of Pounds. The trick seems to do the almost-impossible from an electronic point of view, let alone from the point of view of common sense

author: Rev. Thomas Scarborough
visits: 50
Monitor Splitter circuit diagram
A Simple Splitter Driving Two (or even more) PC Monitors

author: Miroslav Adzic
visits: 46
Speaker Microphone Circuit circuit diagram
This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone

author:
visits: 41
Pot Plant Power circuit diagram
Another Circuit by Rev.Thomas Scarborough

author: Rev.Thomas Scarborough
visits: 40
Ultrasonic Dog Whistle circuit diagram
Circuit with a variable pitch and a relatively loud 82 dB miniature piezo beeper. The circuit is very simple and can be easily assembled in half an hour

author: Tomaz Lazar - Ljubljana, Slovenia
visits: 38
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