Circuits Collection

Infra Red Telephone Sound Smartcard PIC Power Supply Filters

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Infra Red

• Infra Red Remote Transponder
• Cheap 40KHz clock
• A very STABLE 40khz generator
• Minimizing SUN's noise in IR reception
• Build an Infrared night scope
• Decoding IR Remote Controls
• IR 'slotted switch' sensor
• Serial-driven IR remote controller
• IR Opto Detector
• HP48SX IR DECODER
• PC IR Remote Control
• Infrared Transmitter / Detector
• Infrared Remote Control
• IR Type Data Link
• IR Remote Extender
• Infrared Remote Controller
• Infrared Remote Control Tester

Telephone

• Telephone in-use light
• Phone in-use Light
• Phone in-use indicator
• Phone in-use indicator
• Phone in-use indicator
• Phone in-use indicator
• 'phone rang' indicator light
• Detecting a telephone RING
• Detecting a telephone RING
• Detecting a telephone RING
• Detecting a telephone RING
• Phone Off-Hook Indicator
• Phone to audio interface (SSI202 input)
• Phone Line to Audio
• Telephone Line Monitor (Plans)
• Use old phones as an intercom
• Telephone Power?
• Hold function for Telephone
• Digital/Standard Phone Line Tester
• Telephone Tap
• Telephone Controlled Night Light
• Phone Recorder
• Music-On-Hold Box
• Hands-Free Telephone
• Wireless Telephone Eavesdropper

Sound

• Optoinsulated MIDI cable

Smartcard

• Smartcard PC Emulator
• Smartcard Programmer (read - write)

PIC Programmers

• PICALL and P16PRO PICs programmers

Power Supply

• 200W ATX PC Power Supply

Filters

• Filters Notes and n-order filters

• First Order Lowpass I non-inverting
• First Order Lowpass II non-inverting
• First Order Lowpass III inverting

• Sallen-Key (SK) Second order Lowpass I non-inverting
• Sallen-Key (SK) Second order Lowpass II non-inverting
• Multiple Feedback (MFB) Second Order Lowpass I inverting
• Multiple Feedback (MFB) Second Order Lowpass II inverting
• Fliege Second Order Lowpass non-inverting
• Bach Second Order Lowpass non-inverting
• Twin-T Second Order Lowpass non-inverting
• KHN (Non-Inverting Input) Second Order Lowpass non-inverting
• KHN (Inverting Input) Second Order Lowpass inverting
• Tow-Thomas (TT) Second Order Lowpass non-inverting
• Mikhael-Bhattacharyya (MB) Second Order Lowpass non-inverting
• Berka-Herpy (BH) Second Order Lowpass non-inverting
• Akerberg-Mossberg (AM) Second Order Lowpass inverting

• First Order Highpass I non-inverting
• First Order Highpass II non-inverting
• First Order Highpass III inverting
• First Order Highpass IV inverting

• Sallen-Key (SK) Second Order Highpass I non-inverting
• Sallen-Key (SK) Second Order Highpass II non-inverting
• Multiple Feedback (MFB) Second Order Highpass inverting
• Fliege Second Order Highpass non-inverting
• Twin-T Second Order Highpass non-inverting
• KHN (Non-Inverting Input) Second Order Highpass non-inverting
• KHN (Inverting Input) Second Order Highpass inverting
• Mikhael-Bhattacharyya (MB) Second Order Highpass non-inverting
• Berka-Herpy (BH) Second Order Highpass non-inverting
• Akerberg-Mossberg (AM) Second Order Highpass inverting

• Deliyannis Second Order Bandpass I inverting
• Deliyannis Second Order Bandpass II inverting
• Sallen-Key (SK) Second Order Bandpass non-inverting
• Multiple Feedback (MFB) Second Order Bandpass I inverting
• Multiple Feedback (MFB) Second Order Bandpass II inverting
• Fliege Second Order Bandpass non-inverting
• Twin-T Second Order Bandpass inverting
• KHN (Non-Inverting Input) Second Order Bandpass inverting
• KHN (Inverting Input) Second Order Bandpass non-inverting
• Tow-Thomas (TT) Second Order Bandpass inverting
• Mikhael-Bhattacharyya (MB) Second Order Bandpass non-inverting
• Berka-Herpy (BH) Second Order Bandpass non-inverting
• Akerberg-Mossberg (AM) Second Order Bandpass inverting

• Sallen-Key (SK) Second Order Notch non-inverting
• Fliege Second Order Notch non-inverting
• Twin-T Second Order Notch I non-inverting
• Twin-T Second Order Notch II non-inverting
• KHN (Non-Inverting Input) Second Order Notch inverting
• KHN (Inverting Input) Second Order Notch non-inverting
• Mikhael-Bhattacharyya (MB) Second Order Notch non-inverting
• Berka-Herpy (BH) Second Order Notch non-inverting
• Akerberg-Mossberg (AM) Second Order Notch inverting

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