Pocket Tube Radio (T1621E)

This sensitive 4-tube, battery-powered receiver was found in a 1949 Radio Electronics. The circuitry was wired in crystal earphones.

| Clique na imagem para ampliar |

PUT with 2 Transistors (CB4216E)
The circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
800 Hz Band Pass Filter 741 (CB13712E)
This filter was found in a publication for radio amateurs in 1977. The components can be changed for...
Carrier Operated Relay (CB21756E)
Found in a 1977 publication this circuit is relayed from a signal carrier in a receiver....