This circuit was found in a 73 magazine for radio amateurs of the 90s. The circuit uses two types of indicators, the diodes are for general use. The power supply is 5 V.
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...