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 was found in the January 1989 issue of Radio Electronics magazine. The circuit sends...
This simple audio generator with the 741 was found in a 90sTexas Instruments. The circuit...
In fact, this 1994 circuit uses a scale of LEDs to indicate the pulse rate applied to its input....