Schmitt Trigger (CB21849E)

We found this circuit in the 1974 Ferranti transistor manual. Transistors are from the time, being general purpose types.

| Clique na imagem para ampliar |

Expanded-range voltmeter with LM3914 (CB25453E)
This circuit with different colored indicator LEDs has an expanded scale. We found it in the March...
Sampling and Holding LS776 (CB15197E)
This circuit is from the 1982 SGS linear integrated circuit manual. The LS776 is not common today,...
Headlight Off Alarm (CB6326E)
We found this circuit in a 1968 Electronics World. It fires a buzzer if the ignition key is turned on...