Power Grid Monitor (CB21154E)

We found this circuit in a Popular Electronics from the 90s. Its purpose is to monitor a power line. The circuit uses optical couplers of the time.

| Clique na imagem para ampliar |

CMOS 4001 and 4011 Test (CB19073E)
This circuit was developed to test suspect 4001 and 4011 integrated circuits. The circuit is from...
5 V x 100 mA power supply (CB1158E)
The power source shown for powering for small TTL circuits was found on a Radio Electronics...
Solar Cell Switched Regulator (CB1187E)
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit...