The purpose of this circuit is to measure the intensity of audio signals. We found it in the September 1990 issue of Radio Electronics magazine. The circuit works as a S meter.
The voltage reference integrated circuit used in this 1980s unit is hard to find today. The power...
We found this configuration in a technical documentation from 1974. It can test both TTL logic...
This amplifier was obtained from the CA3140 datasheet, an operational amplifier with JFET at the...