Rectangular and triangular generator (CB21333E)

This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the frequency determined by R1, R2 and C1.

| Clique na imagem para ampliar |

LDR and SCR Alarm (CB16415E)
The high sensitivity of this type of SCR recommended in our assemblies allows it to be triggered by low...
Crowbar for power supplies (CB8482E)
Found in a 90s documentation, this circuit triggers the SCR when there is an overvoltage in order...
Scheduled Triggered Timer (CB4338E)
This circuit was found in a 1989 documentation and was intended to be part of a presence...