This circuit is from an 80's Electronic Engineering. The base is a common operating and 4 single integrated voltage comparators. The circuit directly drives 4 indicator LEDs.
This circuit is from a Poptronics, American magazine of August 2000. The circuit can be assembled with...
This is the normal configuration for the TDA2003 integrated circuit, an amplifier that can provide 10...
This stabilized source can supply currents up to 700 mA and the output voltage is close to 15 V. a...