Test circuit with bridge (CB22530E)

This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from Radio Electronics June 1952.

Crystal Pierce Oscillator with Bipolar Transistor (CB13120E)
The original frequency of the Pierce Oscillator with bipolar transistor is given by the crystal, which...
Automatic Hand Dryer (CB17658E)
Of course, the design indicates a specific application for a touch switch. Thus, analyzing the...
Low frequency converter (CB9336E)
This circuit converts signals from the 350 to 500 kHz band to the 4.36 to 4.5 MHz band, enabling...