Designed for the audio track, this circuit was found in a Popular Electronics from the 90's. Other operational can be used and R7 can be 470 k. The frequency is 1 kHz.
This circuit was found in the May 1983 issue of Radio Electronics magazine. The SSM7046 integrated...
This circuit for high power xenon lamps was found in the November 1974 issue of Radio Electronics...
PIC18F “K40” Features Intelligent ADC with Filtering and Signal Analysis Capabilities Ideal for...