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.
In fact, this circuit can generate 50 Hz or 60 Hz signals depending on the power supply. The input...
Found in Motorola documentation from the 1970s, this circuit makes use of period components. The lamp is...
Found in an American documentation, this circuit may employ general purpose transistors and the...