This tester was found in a 90’s Popular Electronics. The integrated circuit is CMOS 4011. The indication is made through LED.
The IC used in this project is not common these days, but if you have one you can build a high...
May 19, 2015 - Mouser Electronics, Inc., the global authorized distributor with the newest...
This circuit is from the Analog Devices component datasheet. In it we have the way to obtain a low...