Light Sensing Circuits

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Sound Card Interface with Tone Keyer
Input-buffered-mixer
0-24VDC Digital PIC Power Supply circuit diagram
dancing lights circuit diagram
Infrared detector circuit using PID20
Metal detector using radio frequency
Notes on the Wenzel low power AM transmitter schematic
160 METER VFO
A functional block diagram of the MC1428
Three-point oscillator inductor



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