Light/Laser Circuits

Radio Rf Receiver Fm Transmitter Amplifier Schematics

CANCK108 - FM Transmitter w/ Line & Mic Input Schematics wiring diagram circuits schema ...

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Crystal radio

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Posted in Audio power amplfier, Audio preamp circuits, Electronics And Projects, Filter schematics, Frequency, Infrared based schematics, Light/Laser Circuits, Radio Control Application, Remote Control, Sound/Radio Circuits, Transmitter/Receiver | 10 Comments »

Touch Activated Light

The circuits below light a 20 watt lamp when the contacts are touched and the skin resistance is about 2 Megs or less. The circuit on the left uses a power MOSFET which turns on when the voltage between the source and gate is around 6 volts. The gate of the MOSFET draws no current so the voltage on the gate will be half the supply voltage or 6 volts when the resistance across the touch contacts is equal to the fixed resistance (2 Megs) between the source and gate.

touch switch

The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end of the supply. Since the base of a bipolar transistor draws current and the current gain is usually less than 200, three transistors are needed to raise the microamp current level through the touch contacts to a couple amps needed by the light. For additional current, the lamp could be replaced with a 12 volt relay and diode across the coil.