This circuit was found in a 73 magazine for radio amateurs from the 90s. The circuit uses high voltage transistors and the relay is high voltage as well.
This amplifier was found in a 1969 Mullard documentation. The circuit uses transistors that have as...
This circuit was developed to test suspect 4001 and 4011 integrated circuits. The circuit is from...
This traditional detector configuration is from an old publication where the MC1555 is the...