Quick Adder (CB20155E)

This is a factory circuit from an 80's manual. The circuit can be implemented with modern operationals and the power supply must be symmetrical.

| Clique na imagem para ampliar |

Light Operated Relay (CB19968E)
This circuit is from an American manual from 1975. The transistors are types of the time, but...
Temperature to Frequency Converter (CB1433E )
We obtained this circuit in a 1977 technical documentation. The basic component is an integrated...
Audible warning (CB9204E)
This circuit that generates a special sound was found in a Popular Electronics from the 90s. The...