SCR crowbar (CB8481E)

Found in a 90s American documentation, this circuit trips when there is an overvoltage at its output. The SCR can be any general purpose.

| Clique na imagem para ampliar |

Crystal controlled oscillator (CB9655E)
This 5.1 MHz oscillator was found in a 1980s American documentation. The used operational...
NOR Gate Using NAND (CB199E)
A NOR gate can be improvised using one NAND gate of a 4011 as shown here. The diodes are...
Pulsating Buzzer (CB24716E)
Found in the September 1982 issue of Radio Electronics magazine, this circuit triggers a relay...