4-band microammeter (CB8210E)

Found in a 90s Radio Electronics this circuit requires precision resistors in the dividing network. The font must be symmetrical.

| Clique na imagem para ampliar |

Integrated Intercom (CB18688E)
This circuit is based on the HA1311 integrated circuit, common at the time the article was...
Synchronized automatic switch (CB9260E)
This control circuit up to 1 kW was found in a 1967 RCA documentation. The components are from...
Power operational (CB8782E)
Found in a 90s Radio Electrconics, this circuit is an operational one with a power stage using two...