Buffer 4049 (CB26316E)

The purpose of this circuit found in a 1990s Popular Electronics is to increase the current capability of CMOS stages.

12V x 1A power supply (CB21851E)
This stabilized power supply was found in the 1974 Ferranti transistor manual. The power...
Bridge Amplifier with LM390 C (CB25308E)
This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio...
Optical Audio Link Receiver (CB13886E)
We found this circuit in a Radio Shack documentation from 1977. The circuit serves for a link of...