TTL insulated shield (CB8073E)

This circuit was obtained in a Popular Electronics of the 90s. The circuit is compatible with microcontrollers being powered by 5 V.

| Clique na imagem para ampliar |

Relative impedance meter (CB7487E)
Found in a 1960 Sylvania manual, this circuit can be implemented with a modern equivalent...
Logarithmic Converter (CB19486E)
This configuration, already presented in other points of this section and website, is of a...
2 Meter Crystal Oscillator (CB4051E)
We found this precise crystal oscillator for the 144 MHz band, depending on the crystal used. The...