Infrared tone transmitter (CB20977E)

This simple very low power circuit can be used in a battery powered infrared tone trigger. We found it in an American documentation from the 90s.

| Clique na imagem para ampliar |

Touch Switch (CB13983E)
This circuit, very traditional, was found in a practical Elettronica of 1977. The source cannot be of...
BTL Amplifier TDA2020 (CB4358E)
This integrated amplifier was found in a non-existent British magazine from 1975. The used...
Precision Current Source (CB21052E)
Found in National Semiconductor documentation from the 1990s, this circuit employs basic...