Variable siren for alarm (CB9086E)

Found in a 1980’s documentation, this circuit must have its signal applied to an amplifier stage. The unijunction transistors can be 2N2646.

| Clique na imagem para ampliar |

One Transistor MW Receiver (CB943E)
This circuit uses one of the first commercial transistors, availble in 1958, year of the...
Nixie or Neon Driver (CB6693E)
This circuit was found in 1966 General Electric documentation. The circuit uses components from the era...
Constant Current Source for LEDs (CB915E)
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...