CircuitsArchive is a Web-based free content project to list Electronic Circuits (schematics, projects, boards, PCBs).
An electronic circuit is an electrical circuit that also contains active electronic devices such as microprocessors, transistors or vacuum tubes.
The archive is organized into the following categories:- Audio
- Batteries
- Filters
- First Order High-Pass
- First Order Low-Pass
- Notes on Filters
- Second Order Band-Pass
- Filter Akerberg-Mossberg (AM) Second Order Bandpass inverting
- Filter Berka-Herpy (BH) Second Order Bandpass non-inverting
- Filter Deliyannis Second Order Bandpass I inverting
- Filter Deliyannis Second Order Bandpass II inverting
- Filter Fliege Second Order Bandpass non-inverting
- Filter KHN (Inverting Input) Second Order Bandpass non-inverting
- Filter KHN (Non-Inverting Input) Second Order Bandpass inverting
- Filter Mikhael-Bhattacharyya (MB) Second Order Bandpass non-inverting
- Filter Multiple Feedback (MFB) Second Order Bandpass I inverting
- Filter Multiple Feedback (MFB) Second Order Bandpass II inverting
- Filter Sallen-Key (SK) Second Order Bandpass non-inverting
- Filter Tow-Thomas (TT) Second Order Bandpass inverting
- Filter Twin-T Second Order Bandpass inverting
- Second Order High-Pass
- Filter Akerberg-Mossberg (AM) Second Order Highpass inverting
- Filter Berka-Herpy (BH) Second Order Highpass non-inverting
- Filter Fliege Second Order Highpass non-inverting
- Filter KHN (Inverting Input) Second Order Highpass inverting
- Filter KHN (Non-Inverting Input) Second Order Highpass non-inverting
- Filter Mikhael-Bhattacharyya (MB) Second Order Highpass non-inverting
- Filter Multiple Feedback (MFB) Second Order Highpass inverting
- Filter Sallen-Key (SK) Second Order Highpass I non-inverting
- Filter Sallen-Key (SK) Second Order Highpass II non-inverting
- Filter Twin-T Second Order Highpass non-inverting
- Second Order Low-Pass
- Filter Akerberg-Mossberg (AM) Second Order Lowpass inverting
- Filter Bach Second Order Lowpass non-inverting
- Filter Berka-Herpy (BH) Second Order Lowpass non-inverting
- Filter Fliege Second Order Lowpass non-inverting
- Filter KHN (Inverting Input) Second Order Lowpass inverting
- Filter KHN (Non-Inverting Input) Second Order Lowpass non-inverting
- Filter Mikhael-Bhattacharyya (MB) Second Order Lowpass non-inverting
- Filter Multiple Feedback (MFB) Second Order Lowpass I inverting
- Filter Multiple Feedback (MFB) Second Order Lowpass II inverting
- Filter Sallen-Key (SK) Second Order Lowpass I non-inverting
- Filter Sallen-Key (SK) Second Order Lowpass II non-inverting
- Filter Tow-Thomas (TT) Second Order Lowpass non-inverting
- Filter Twin-T Second Order Lowpass non-inverting
- Second Order Notch
- Filter Akerberg-Mossberg (AM) Second Order Notch inverting
- Filter Berka-Herpy (BH) Second Order Notch non-inverting
- Filter Fliege Second Order Notch non-inverting
- Filter KHN (Inverting Input) Second Order Notch non-inverting
- Filter KHN (Non-Inverting Input) Second Order Notch inverting
- Filter Mikhael-Bhattacharyya (MB) Second Order Notch non-inverting
- Filter Sallen-Key (SK) Second Order Notch non-inverting
- Filter Twin-T Second Order Notch I non-inverting
- Filter Twin-T Second Order Notch II non-inverting
- Geiger Counters
- Ham Radio
- High Voltage
- Infrared
- Decoding IR Remote Controls
- HP48SX IR DECODER
- Infra Red Remote Transponder
- Infrared Remote Control
- Infrared Remote Control Tester
- Infrared Remote Controller
- Infrared Transmitter / Detector
- IR Opto Detector
- IR Remote Extender
- IR slotted switch sensor
- IR Type Data Link
- Irda Adapter
- Irda Serial Receiver
- Minimizing SUNs noise in IR reception
- PC IR Remote Control
- Serial-driven IR remote controller
- LED
- Meters
- Motors
- Oscillators
- PC Power Supply
- PIC
- Repair
- SmartCard
- Solar
- Telephone
- Detecting a telephone RING 1
- Detecting a telephone RING 2
- Detecting a telephone RING 3
- Detecting a telephone RING 4
- Digital/Standard Phone Line Tester
- Hands-Free Telephone
- Hold function for Telephone
- Isolated Telephone Interface
- Music-On-Hold Box
- Phone in use indicator 1
- Phone in use indicator 2
- Phone in use indicator 3
- Phone in use indicator 4
- Phone in use indicator 5
- Phone in use indicator 6
- Phone in use indicator 7
- Phone Line to Audio
- Phone rang indicator light
- Phone Recorder
- Phone to audio interface (SSI202 input)
- Telephone Controlled Night Light
- Telephone Line Monitor (Plans)
- Telephone Power
- Telephone Tap
- Use old phones as an intercom
- Wireless Telephone Eavesdropper
- Various
