Another of the many tachometer circuits we have on our site. This one is from the September 1976 Radio Elecronics magazine. The circuit is connected to the platinum contacts of a car or to a sensor.
This preamp with a transistor for turntables with crystal capsules was found in a Japanese...
This variable frequency oscillator generates signals that have a recurrence frequency determined by...
This circuit with neon lamp and unijunction was found in the September 1970 Radio Electronics...