Preamplifier for voltmeter (CB21950E)

This circuit for electronic voltmeter was found in a publication by Gernsback from 1960. The transistor used is germanium of the time.

TTL Oscillator (CB5996E)
We show an oscillator that produces rectangular TTL signals based on inverters. Inverters can also be...
Bistable LM139 CB14240E (CB14240E)
The configuration shown in the figure makes use of two comparators of the four available on the...
TDA2002 Amplifier (CB420E)
When powered by a 14 V supply this circuit source 5,2 W to a 4 ohm load. For a 2 ohm load this...