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.
Equivalent transistors can be used in this high impedance and low capacitance circuit. The circuit is...
This circuit uses a modulated signal from a PLL 567 to operate safely with an infrared emitter. The...
In the figure we have a battery charging circuit for currents up to about 5 A. In series with the...