With this circuit it is possible to use a frequency meter as a tachometer. The circuit was found in American documentation from the 90s. The phototransistor can be of any type.
The purpose of the diode in this oscillator circuit is to limit the amplitude of the output...
The integrated circuit used in this oscillator is no longer common in our market, as the...
Found in Maxim's documentation, this high frequency circuit uses period components. The graph...