9 to 25V x 100 mA regulator (CB8825E)

This small voltage regulator was found in a 1969 EEE. More powerful transistors can be used to obtain a higher output current.

| Clique na imagem para ampliar |

Solar intercom (CB20503E)
This circuit can be used in demonstrations or science fairs. The circuit uses headphones and can...
FM modulator with 555 (CB12102E)
In this circuit we show how to modulate the pulses produced by a 555 in frequency. The circuit can be...
Frequency modulator (CB4106E)
In the figure we show how to use a varicap to modulate a signal in frequency. The circuit can be...