Reverse polarity protection relay (CB8905E)

This circuit was found in a 90s EDN. It activates a protection relay in case of reversing the polarity of the supply of a load.

| Clique na imagem para ampliar |

Tremolo circuit (CB9374E)
Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the...
High Fidelity Amplifier (CB954E)
I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor...
CMOS Flip-Flop with the 4027 (CB11462E)
This is the basic configuration of a CMOS 4027 integrated circuit as a flip-flop. The circuit can...