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.
Found in 90s Popular Electronics, this circuit fires a load through a MOSFET from an audio signal...
Found in Radio Electronics from the 90s, this circuit uses components from that time. However, it...
This automatic volume control for audio signals was found in American documentation from the 90s....