This additional bell circuit was found in the February 1994 Electronics Now magazine. The transistors are common, and the circuit is for analog lines.
This circuit with output powers of 2 to 3 W depending on the power supply was found in the...
This JFET amplifier was found in documentation from 1958. The circuit has voltage gain of 4 and 10...
This circuit was obtained from an American publication of the 80's. The integrated circuit is of the...