Found in na 1969 Electronics World, this circuit makes use of transistors of the time. Equivalent transistors can be used. The diodes can be 1N4004.
This circuit generates pulses from 0.5 Hz to 500 kHz, adjusted by potentiometer P2. The transistor can...
Suggested by a 1966 publication, this circuit applies a 60 Hz signal to a transistor to test its...
This preamplifier for the 6 or 2-meter range was obtained from an American documentation from the...