We found this circuit in a 1977 factory documentation. The operational amplifiers can be 741 and the symmetrical power supply. Capacitors can be changed for operation at other frequencies.
This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968...
Found in a 1980s documentation, this circuit uses transistors from that time. Modern equivalents can be...
The SH-205R receiver was sold in the 1960s in Japan. It used two germanium transistors and had a...