400 mW amplifier (CB9056E)

Found in a 1970s documentation, this circuit has a flat response from 15 Hz to 130 kHz. Modern equivalent transistors can be used.

15 V Symmetrical Power Supply from 5 V with the 555 I (CB1480E )
This circuit, found in a 1978 publication, converts 5 V into a symmetrical 15 V output under low...
Low distortion oscillator (CB9200E)
This Wien bridge oscillator was found in a 90's EDN. The components are from that time and the...
VLF Converter (CB7326E)
Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz...