This optical coupler for short distances is powered by 12 V which is the voltage of the lamp and the relay. The circuit can also use emitting LEDs and the phototransistor can be of any type.
This zero crossing detector is of the 1993 Motorola Linear Interface ICs. The source is...
This microtransmitter operates at a frequency between 3.5 MHz and 10 MHz determined by the...
The maximum frequency of this oscillator depends on the operational. For common types, the limit is...