The speed indication of this circuit is made on an analog instrument. The circuit is used to count pulses (rpm) and was found in April 1976 Radio Electronics magazine.
Found in an American documentation, this circuit shows how an interface should be made for...
One touch of the push button S1 and the circuit LEDs shown in the figure start to flash rapidly. The...
In the figure we have an RF amplifier for tunnel diode. The frequency range will depend on the...