This circuit was found in a 1970s General Electric documentation. This circuit already used an emitting LED. The circuit operates at frequencies from 50 Hz to 50 kHz with short pulses
This is an amplifier stage with a typical germanium transistor from the 60's to the 70's. The...
Also suitable for use as a noisy alarm, this Morse Code or telegraph practice oscillator was found...
This circuit was found in ancient American documentation. Diodes are general-purpose types. |...