This circuit is from the 1983 Intersil Databook. The circuit has an A / D converter for display of 4 and a half digits being powered by a voltage of 9 V.
Found in Maxim's documentation, this high frequency circuit uses period components. The graph...
We found this circuit in an 80's Radio Shack publication. The circuit uses a company buzzer, but...
This interesting FET-tester circuit was obtained from an old American documentation. The bipolar...