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.
The circuit presented uses an integrated circuit Sanyo, not very common in our day. This amplifier provides...
This 80's circuit uses a light-sensitive SCR or LASCR and a one-sided silicon switch SUS, uncommon...
This circuit is from an old documentation making use of a 3,579,645 MHz analog color television...