Audio

Audio amplifiers, preamplifiers, volume control and more...

Video & TV

Electronic devices for TV and video

Power

Power Supplies, Ni -Cd Batteries Charger, Voltage Inverter and others..

RF

FM and AM radio, FM Transmitter, Powerful AM transmitter and other RF circuits

Digital

Card programmers, adapters and other circuits with microcontrollers

Computer

PC based Frequency Meter, The Simplified I/O Interface, VGA to TV Scart...

Telephone

Telephone amplifier, Smart Phone light, Conversation Recorder, Simple Phone Tap...

Measurement

Digital Voltmeter, Capacitance Meter, IR Remote Control Tester, Transistor Tester...

Security

Fire Alarm, Metal Detector, Police Siren, UltraSonic Radar, Door Alarm...

Lights & LED

Lights & LED circuits

Oscillators

Voltage Controlled Oscillators, Waveform Generators and others oscillators and generators

Op Amplifiers

Operational amplifier circuits and applications.

Other

Schemstics that not included in other categories