Privacy policy and cookies - INCBTech uses cookies and similar technologies to help deliver the best experience on our site. Our cookies are necessary for the operation of the website, monitoring site performance and to deliver relevant content. You can visit our Privacy Centre to learn more about your online settings.

Search

Polarity Indicator (CB219E)

This circuit uses the 741 Operational Amplifier to drive two LEDs. The LEDs indicate the signal of the input voltage, The circuit is very sensitive and can be used with voltage sources between 9 and 15 V. R4 depends on the power supply voltage. For a 12 V supply we recommend a 1 k ohm resistor.