Bicycle speedometer (CB7382E)

This circuit appears in other versions on this site. obtained from other publications. This is from American documentation from the 90s.

| Clique na imagem para ampliar |

DC Voltmeter with CA3140 (CB21718E)
We found this circuit in an internet documentation. The circuit uses a 1 mA instrument, and the...
Tachometer using the 555 (CB414E)
This circuit can be used to measure the frequency of a low frequency square signal. The signal can be...
Electronic Thermometer (CB18201E)
This circuit is from 1985 documentation. The integrated circuit used is not very common today, but...