We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The transistors were common at the time and the transformer was from a transistor radio output.
This circuit is a high voltage source for a gas LASER. We found it in a documentation from the...
This intercom with wires up to 30 meters separation between the stations is from the Linear...
This circuit is from an old American publication from 1977. Transistor Q1 can be a TIP42 and Q2 a...