This simple audio generator with the 741 was found in a 90sTexas Instruments. The circuit generates sinusoidal signals from 15 Hz to 150 kHz in 4 bands, as shown in the diagram.
I found this circuit in a 1978 publication. The circuit can be assembled with a BD136 transistor to...
This sensitive 4-transistor signal follower can be used in both audio and RF circuits. P1 is a...
This is a commercial circuit from the year 1958. Transistors are germanium types and transformers...