This 4 1/2 digit digital voltmeter circuit was published in the April 1993 Electronics Now magazine. The circuit uses the integrated component of the time and has 5 voltage ranges.
This timer circuit was found in a 1980s American documentation. Transistors and SCR support modern...
Found in a 1960s documentation, this circuit uses an operational amplifier from the time and a...
The displayed relay operates with an audio signal applied to the input. The transistors can be...