This bargraph circuit is from an ancient American documentation. It indicates the charge state of a set of 4 batteries from 9.6 to 5.2 V.
This circuit has been found in an old American documentation, but can be easily implemented with common...
June 2017 - Mouser Electronics has in stock the new HumpRO frequency hopper transceivers from Linx...
This astable multivibrator using two transistor controls two small 50 mA lamps. The lamps can be...