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 was found in a 1965 Radio Shack documentation. The transistors are from that time....
This circuit was obtained in a Motorola documentation from 1968. The circuit uses a power...
This receiver can be used to receive signals from the previous circuit transmitter. The circuit is...