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 |

Controlled gain amplifier TBA400 (CB21886E)
This circuit was obtained from the 1976 Siemens Integrated Circuits Manual. It is the circuit for...
Two-Transistor Oscillator (MSB019E)
The circuit is a multivibrator version using two NPN general purpose transistor. This circuit can...
Electronic Thermometer (CB19604E)
The sensor of this circuit is a thermistor of the same value as the adjustment circuit formed by...