Telephone Ringer Amplifier (CB25751E)

For analog lines, this circuit was found in the August 1994 issue of Electronics Now magazine. The transistors are common general-purpose types.

| Clique na imagem para ampliar |

Sustain For Guitar (CB4459E)
This guitar sustain circuit uses only two transistors and can be powered by a 9V battery. The...
Walk Talkie for 1 km (CB3826E)
This circuit using components that are still common in our market was found in a 1987...
Light to Frequency Converter (CB5101E)
The integrated circuit used in this 80's application is not common today, but the design serves as...