This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
This 4-competitor TTL speed game was obtained in a 1980s documentation, but can still be easily...
This powerful sound emitter used in defense to intimidate people was found in a 90s Popular...
This circuit triggers an alarm when the mains power is cut off. The circuit was found in the July...