This oscillator version is from an RCA documentation from the 1970s. Transistors support modern equivalents and the power can be supplied in a voltage range of 5 to 12 V. For Q2 we suggest the BD136.
This circuit uses a sensitive reed relay to control external loads. The time delay is given by the...
The circuit in the figure uses hall sensors to obtain the current measurement through the magnetic...
This circuit of a 73 American magazine from the 1990s can generate multiple frequency signals from the...