VMono VU meter (CB8229E)

Found in 90s Radio Electronics, this audio indicator makes use of an integrated circuit that is uncommon today.

| Clique na imagem para ampliar |

Darlington Touch Switch (CB7191E)
This circuit is from 1968 General Electric documentation. It can certainly be adapted for any...
Capacitor Tester (CB4391E)
This tester from a 1960 magazine is only for capacitors with insulation voltages above 200 V (110...
Unijunction Telegraphy Oscillator (CB12283E)
Found in a 1991 publication this circuit can be assembled with more modern components. We can use...