PH meter (CB20731E)

This circuit was obtained in an old American documentation. The integrated circuit used is uncommon today. Modern equivalents can be searched.

| Clique na imagem para ampliar |

Relativity Converter (CB24751E)
This circuit is suitable for applications in medical, research and industrial equipment. The...
Class B 15 W Output Stage (CB984E)
This circuit, found in a publication of the year 1968, uses a transformer to drive two power...
Precision Timer (CB15099E)
This 100-second timer was found in a 2000 Poptronics. The magazine no longer exists, but the...