This circuit makes use of an unusual Analog Devices component today. The circuit is from a 90's documentation. The amplifier has 80 dB gain.
Found in a November 1977 Radio Electronics magazine, this digital circuit was described in an...
This circuit is from a manual of linear integrated circuits of the 80s. The operational is of the...
The tone generated by this bell changes when we press and release the switch. The circuit is from...