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.
This circuit has a very fast switching action from an input signal. It can be applied to almost any...
This circuit drives 10 LEDs in sequence at a speed that depends on the setting of P1. For 9 or 12 V...
The amplifiers of the LM3900 can also be used as voltage comparators in several projects. The...