Hearing aid amplifier (T1580E)

This circuit is from a 1947 Radio Electronics. The 4-tube circuit is battery powered and uses a crystal phone.

| Clique na imagem para ampliar |

Lamp Flasher LM3909N (CB4556E)
a This circuit was obtained from a 1978 Practical Wireless. It causes a low-power 1.5V lamp to...
Nerve LED (CB17379E)
This game consists of a variation of the Nerve-Test with the difference that errors are indicated...
Transformerless Power Sup (MSB001E)
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...