This circuit uses a 7-segment display to indicate the logic level of a test circuit. The power supply is made with 5 V that can come from the analyzed circuit itself.
This circuit is from the 1972 RCA Linear Integrated Circuits Manual, but it can be made based on...
This circuit was found in documentation on FETs from the 1980s. The circuit receives an audio...
This circuit was found in a Radio Electronics from 1970. The coupler with LDR is from that time,...