The operational amplifier for this tone control found in a 1977 Signetics manual may be the 741. The power supply must be symmetrical and the signal cables short. The bass gain is 20 dB.
This circuit functions as a thermostat triggering a relay when the boil control temperature...
The circuit presented is quite simple, employing tone modulation of the signal. To receive the...
El circuito de la figura es sugerido por National Semiconductor y puede servir de base para una...