The circuit transistors, found in a 1974 documentation, may be the BC548. The circuit is used in quadriphonic systems to combine signals.
This circuit uses an operational that is not currently common. We found it in an old American...
This circuit uses two transistors to obtain low frequency sinusoidal signals. We found it in a...
This amplifier can be powered with voltages between 2 and 5 V with power up to 100 mW. The minimum...