Using one unijunction transistor and two bipolar transistors, this circuit generates a signal from 25 Hz to 3 kHz. The circuit is from Electronics Now magazine, January 0, 1994.
A flash of light on one sensor or the touch of your fingers on the other type of sensor will turn...
In the figure below we have a simple way to perform a function test for a solar cell. The circuit is...
This circuit is used in short wave receivers that do not have the BFO (Beat Frequency Oscillator) for...