Melody generator (CB9207E)

Found in an Elektor from the 90s, this circuit is based on components that are still common today. Power is supplied with only two batteries.

| Clique na imagem para ampliar |

Single Cell Barometer (CB4913E)
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...
VCR Amplifier (CB25269E)
This circuit for VCR recording heads was found in the February 1990 issue of Radio Electronics magazine....
Speed Control LM13080 (CB4859E)
The integrated circuit used in this project is not common today. It was found in a 2000...