This circuit was found in a documentation from 1948. There are 5 valves with push-pull output. The source uses a transformer, and the indicated application is with turntables.
This circuit allows the measurement of resistance in the megohms range using an indicator LED and...
The purpose of this circuit is to enable the car or motorcycle starting system only for a certain...
With this circuit it is possible to receive signals in the 2 m (150 MHz) range on a pocket AM...