Contains huge collection of free circuit for students or Professionals and the circuit links are well categorized to different sub groups.
Power - Converter, Inverter, Rectifier, Regulator, Power Supply, and Battery Charger
Control - Controller1, Controller2
Instrumentation - Alarm, Analog to Digital and Digital to Analog Converter, Sensors and Instrument
Radio Circuits - FM Transmitter Receiver and AM Transmitter Receiver
Video Circuits - Video Amplifier, Video Transmitter, video converter and video miscellaneous
Signal - Function generator and Active and passive filter
Audio Circuit Diagram - High power audio amplifier, Audio tone control and mixer, Door bell circuit diagram, DTMF tone generator, Siren tone generator, Two way intercom, Audio level indicator and Audio preamplifier
Telephone circuit - Telephone ringer, Telephone audio, Telephone indicator and display and Telephone miscellaneous.