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 oscillator generates C1-dependent rectangular 100 kHz signals. The circuit requires symmetric...
This 5 V power supply for TTL circuits was found in an article that taught how to assemble a test...
This circuit with 4 diodes was found in the July 1984 Radio Electronics magazine. The voltage of...