This circuit allows you to simulate an analog telephone line for the repair and testing of devices. The circuit is from 1994 and all the components used are common.
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...