We found this circuit in a 2002 documentation. This die shows numbers 1 to 6 on a common anode display when the switches S1 and S2 are pressed. The circuit can be powered by voltages from 5 to 12 V.
We found this circuit in Radio Electronics magazine from April 1960. It works for both NPN and PNP...
This is an audio amplifier typical of an old tape recorder. The circuit is from a Radio...
This circuit uses a selector switch to select resistors for timings given in seconds. Capacitor C1 can be...