Audible Voltmeter (CB21395E)

This circuit was found in an American publication from 1969. Transistors are from the time and can be replaced by modern equivalents.

| Clique na imagem para ampliar |

800 Hz Pulsed Tone Generator (CB25519E)
This circuit is recommended for alarm systems since it has a good output stage. The circuit is...
Gain 150 000 amplifier (CB6636E
) Suggested by Philips in a 1968 documentation this circuit has very high 10 ohm on-load voltage...
7 W amplifier (CB8946E)
No information is given about the transformers in this circuit suggested by Motorola in a 1968...