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 |

Voltage Monitor (CB11028E)
This circuit was obtained from a Hands-On Electronics, an American magazine from January 1987. The...
3-Transistor Commercial Transistor Radio (CB18381E)
This receiver for listening to the TR-23 phone was manufactured in Japan in the 1960s. The circuit is...
Operational 100 Hz (CB14069E)
This astable multivibrator with an operational one at the time was found in the National...