Electronic circuit schematics by category

Category	No.	Description
Alarms	98	Alarms and security related electronic circuit diagrams / circuit schematics
Amplifiers	84	Audio power amplifier circuit diagrams / circuit schematics
Arduino	54	Arduino based circuit diagrams and general Arduino projects
Audio	111	Misc audio circuit diagrams / circuit schematics (also see Music, Amplifiers and Preamp circuits)
Automotive	71	Automotive, car and motorcycle electronic circuit diagrams / circuit schematics
Control	119	Motor and general control electronic circuit diagrams / circuit schematics
Data Acquisition	44	Data acquisition (DAQ) and data logging circuit diagrams / circuit schematics
Filter	45	Electronic filter circuit diagrams / circuit schematics
Games	76	Games and fun stuff (electronic circuit diagrams / projects)
IR	69	Infrared based electronic circuit diagrams / circuit schematics
Laser	43	LASER related power supplies and data transmission circuit diagrams / circuit schematics
LED	99	LED related electronic circuit diagrams / circuit schematics
Lighting	51	Lighting and light controller electronic circuit diagrams / circuit schematics
Medical	32	Medical and health related electronic circuit diagrams / circuit schematics
Metal	37	Metal detector circuit diagrams and projects
Microcontroller	133	Microcontroller based electronic circuit diagrams / circuit schematics (also see Programmers)
Misc	225	Miscellaneous electronic circuit diagrams / circuit schematics
Models	91	Models, remote control toys, robotics related electronic circuit diagrams / circuit schematics
Music	84	Music related electronic circuit diagrams / circuit schematics (also see Audio)
PC	116	PC (personal computer) related electronic circuit diagrams / circuit schematics
PDA	20	Smartphone / PDA / MP3 music player interface circuit diagrams / circuit schematics
Photo	42	Photography related electronic circuits and electronic projects
Power	164	Power supply and power control circuit diagrams / circuit schematics
Preamp	43	Audio preamp circuit diagrams / circuit schematics
Programmers	21	Circuit diagrams and construction details for microcontroller programmers
RF	187	Radio-frequency RF circuit diagrams (also see RF Amplifier and Transmitter circuit diagrams)
RF_Amplifier	32	RF (radio frequency) amplifier circuit schematics (also see RF and Transmitter circuit diagrams)
Solar	39	Solar-power electronic circuits and electronic projects
Telephone	74	Telephone and intercom related electronic circuits and electronic projects
Test	194	Test equipment circuit diagrams and electronic projects
Timing	79	Timing and oscillator circuit diagrams / circuit schematics
Transmitters	94	Transmitter circuit schematics includding bugging device circuits (also see RF circuit diagrams)
Tube	42	Vacuum tube / valve, VFD and nixie tube based circuits and projects
Video	69	Video related circuit schematics / circuit diagrams including video transmitter circuits