SKEMA AMPLIFIER * The Emperor's New Amplifier * CMoy Pocket Amplifier * Superamp * Power amplifier 60W Class A * Power Amplifier 50W * Power amplifier 65W with HEXFET * Headphone Amplifier * Trainwreck Express Guitar Amplifier * Headphone Amplifier * 10W Mini Audio Amplifier * 10W Audio Amplifier with Bass-boost * Amplified Ear * 10 Watt Amplifier * 20 dB Amplifier and High current balanced line driver. * 80W Operational Amplifier * 8 watt Audio Amplifier * 2 x 220W RMS Audio Amplifier * 3 - 5 Watt Class-A Audio Amplifier * 2 Watt Audio Amplifier * 50 Watt Amplifier * 4-WATT AF AMPLIFER * Amplifier 2x30W with STK465 * 20 Watt / Channel Stereo Power Amplifier * 20 Watt Power Amplifier * A Really Simple Power Amplifier * Single Chip 50 Watt / 8 Ohm Power Amplifier * 1,500W / 4 Ohms Power Amplifier * Subwoofer Amp * GainClone Amplifier * Class-D Audio Power Amplifier * Opamp Based Power Amplifier * 25W Class-A Hi-Fi Power Amplifier * 8 Watt Amplifier * 60W Bass Amplifier * 70W Class AB Hi-Fi Amplifier * 60W Guitar Amplifier *
60-100W Hi-Fi Power Amplifier * Simple Current Feedback Power Amplifier * 300W Subwoofer Power Amplifier (Updated) * 60 Watt Into 8 Ohms Power Amplifier * Low distortion 30W audio amplifier * 60W Power Amplifier * Improved 3 Transistor Audio Amp (80 milliwatt) * Bridged Amplifier 15W/4Ω * Guitar Amplifier * Power Amplifier 45W with HEXFET * Tube power amplifier 5W with EL84 * Motorola Hi-Fi power amplifier * Pocket headphone amplifier * 8 Watt Amplifier * Headphone Amplifier * Quadraphonic Amplifier
* Portable headphone amplifier
* 25 Watt MosFet Audio Amplifier
* 2N3055 Power Amplifier
* 18W Audio Amplifier
* 60w Mosfet Audio Amplifier
* 10W Mini Audio Amplifier
* Leslie 122 Rotor and Reverb Amplifier
* Ampeg M-12-A Amplifier
* Low impedance microphone amplifier
* Portable Headphone Amplifier
* 100W RMS Amplifier
* 300W Subwoofer Power Amplifier
* Trainwreck Express Guitar Amplifier
* Headphone Amplifier
* ZUPER POWER AMPLIFIER
* Headphone amplifier with TDA2004
* 45 Watt Single Chip Amplifier
* Power amplifier 60W/8Ω
* 10-W Class A Amplifier
* 100 to 150 Watt Amp
* 100W Audio Amplifier
* 100W Guitar Amplifier
* 100W RMS Amplifier
* 200W audio amplifier
* 250 Watt Amplifier
* 2-TRANSISTOR AUDIO AMPLIFIER
* 25 Watt MosFet Amplifier
* 22 Watt Audio Amplifier
* 20W Class-A Amplifier
* 22 Watt Audio Amplifier
* 16 watt amplifier
* 110 mW Amplifier Schematic
* 15 Watt Amplifier
* 16 Watt Bridge Amplifier Schematic
* 18W Audio Amplifier
* 15 Watt Tube Amplifier
* Mini-box 2W Amplifier
* 2 Watt Audio Amplifier
* 2 Watt Amplifier Schematic
* 10-Bit Bridge Sensing Circuit Using the PIC16C6XX and MCP601
* Bridging enhances filter close-in selectivity
* Bridging Adapter For Power Amplifiers
* Bridge Sensing with the MCP6S2X PGAs
* 80W Operational Amplifier
* LM12 Simple Power Amplifier
* 100W Guitar Amplifier
* 100W Guitar Amplifier 2
* Mini 10W Amplifier
* 1W Amplifier
* 10 Watt Audio Amplifier
* 100W Audio Amplifier
* 100W Guitar Amplifier Schematic
* 15 Watt Amplifier
* 18W Audio Amplifier
* 2 Watt Audio Amplifier
* 2x20 Watt Stereo Power Amplifier
* 22 Watt Audio Amplifier
* 20W Class-A Amplifier
* 22 Watt Stereo Amplifier
* 25 Watt MosFet Audio Amplifier
* 2 channels preamp mixer
* 300W Subwoofer Power Amplifier
* 50 Watt Amplifier
* 60W Guitar Amplifier
* 8 Watt Amplifier
* 200 Watt audio amplifier
* Telephone Headset Amplifier
* AF power amplifier
* AF power amplifier II
* 3 Transistor Headphone Amplifier
* 10 Watt Guitar Amplifier
* Portable Headphones Amplifier
* Class-A 100W Amplifier
* Stereo Headphone Amplifier
* Two Transistors Audio Amplifier
* Stereo Amplifier
* Quadraphonic Amplifier
* Class-A Power Amp
* 50 Watt Power Amplifier
* magnetic pickup amplifier
* OpAmp LM741 circuits
* 100W Class-A//AB Amplifier
* Amp with Tone Controls & Soft Switching
* Headphone Amplifier
* Headphone Amplifier
* MosFet Audio Amplifier
* 2W Amplifier
* 14 Watt Audio Amplifier
* 68-Watt Amplifier with LM3886
* PracticeMan - guitar amplifier
* Headphone Amplifier
* Amplifier Bridging
* Hi-Fi Headphone Amplifier
* Class-A Power Amp
* Biasing Op-Amps into Class A
* Amplifier based on LM4780
* 20W TPA3001D1EVM class-D audio amplifier
* True digital audio amplifier (TDAA) system
* Simple amplifier with LM386
* TDA1554 / 22W Stereo Amplifier
* Loudspeaker as a Microphone
* 20 Watt Audio Amplifier
* 10 Watt Power Amplifier (TDA2030)
* LM390 Bass Amplifier
* Mini Audio Amplifier
* 100 watt power amplifier
* 60W Power Amplifier with 2N3055
* 200W audio power amplifier
* 2x 2,500W RMS stereo amplifier
* 25W Mosfet audio amplifier
* 2x30W audio amplifier (STK465)
* 60W Bass Amplifier and Preamp
* 50 Watt Amplifier ICL8063
* 80W power amplifier MJ3001 and MJ2501
SKEMA STEREO : * Stereo Synthesizer
* Stereo VU Meter
* EM Field Probe with Meter
* 2W Amplifier
* Panner Waveform Generator
* FM stereo multiplex generator
* Micro Power FM Broadcasting
* Stereo FM Transmitter
* HI-FI Stereo Encoder / Multiplexer
* 200mW FM transmitter
* Colour (Sound) Organ
* Bass -Treble Tone Control
* CD-ROM Drive as Digital-audio CD-Player
* TDA1554 / 22W Stereo Amplifier
* Surround Sound Decoder
* TDA1524 Stereo Tone Control
* low pass filter subwoofer
* 2x 2,500W RMS stereo amplifier
* 2x30W audio amplifier (STK465)
* PC Spectrum Analyzer
* 2x20 Watt Stereo Power Amplifier
* 22 Watt Stereo Amplifier
* 25 Watt MosFet Audio Amplifier
* 50 Watt Amplifier
* dish microphone
* Portable Mic Preamplifier
* Simple microphone preamplifier
* Simple microphone pream
* Voltage Controlled Panner
* 2 lines FET Audio Mixer
* Stereo Audio signal Isolator
* Audio stereo Panner
* Panner Waveform Generator
* Stereo Headphone Amplifier
* 2x10 LED VU Stereo Meter
* 4 lines Stereo Mixer
* Stereo Amplifier
* Color Organ
* EM Field Meter
* Simple Surround Processor
* Simple Surround Sound Decoder
* Cut Phone Line Detector
* Control 32 DAC channels via a parallel port
* 25 Watt MosFet Amplifier
* Mini-box 2W Amplifier
* Bridging Adapter For Power Amplifiers
* 12 Volt 20 Amp Solar Charge Controller
* Micro Power FM Circuits
* Class A2 SV811-10 Stereo Amp
* Push-Pull Class A 2A3 Stereo Amp
* Audio Auto Shutoff
* 12 to 120 Volt Inverter
* NTE789 Stereo Multiplex Decoder
* Stereo Decoder Circuit
* Stereo Decoder for FM Tuner
* TDA1591 PLL stereo decoder
* Mobile MP3 Player PC
* Voltage Controlled Panner
* LED VU Stereo Meter
* Stereo preamp
* Stereo Mixer Schematic
* Stereo Tube Amplifier
* 100W RMS Amplifier
* Stereo Equalizer and Balance
* The Big-E Stereo Parabolic Microphone
* Boundary-layer dish microphone
* Digital Volume Control
* FET Audio Mixer
* Simple Surround Processor
* Stereo Audio Isolator
* Stereo Channel Selector
* Three-Level Audio Power Indicator
* IR Remote Control Jammer
* Three-Level Audio Power Indicator
* VU Stereo Meter
* CD-ROM Drive as Digital-audio CD-Player
* Inverter
* Video Switch
* 8x Stereo audio/video distribution router
* Stereo Preamplifier with Bass-boost
* Bass-treble tone control circuit
* Simple microphone preamplifier
* Bass-treble tone control circuit
* Battery-Powered Stereo Balance Control Features Low Distortion
* Stereo Width Controllers
* Micro Power FM Broadcasting Circuits
* Hear Amateurs on your FM Radio!
* REGENERATIVE RECEIVER
* Inverter
* 12 Volt DC to 120 Volt AC Inverter
* 25 Watt MosFet Audio Amplifier
* 5 band graphic equalizer using a single IC/chip
* Simple microphone preamplifier
* Portable Microphone Preamplifier
* FET Audio Mixer
* Stereo Mixer
* Audio Mixer - Transistorized
* Stereo Width Controller
* 6-Band Graphic Equalizer
* Portable Microphone Preamplifier
* Simple Stereo Electret Microphone Preamplifier
* Modular Preamplifier with IC Class A
* 5 band graphic equalizer using a single IC/chip
* 2Channel Microphone Stereo Mixer
* 50 Watt Amplifier
* 20 Watt / Channel Stereo Power Amplifier
* Class-D Audio Power Amplifier
* Headphone Amplifier
* Stereo Tube Amplifier
* Portable headphone amplifier
* Portable Microphone Preamplifier
* Stereo Preamplifier with Bass-boost
* Stereo Preamplifier with Bass-boost
* Stereo Preamplifier with adjustment tone
* A Buffered Headphone Driver
SKEMA PRE-AMP * Simple Phono Preamplifier
* Soundblaster Preamp
* Audio Booster
* Electret Microphone Preamplifier
* Audio splitter
* Loudspeaker as a Microphone
* low pass filter subwoofer
* Phono Preamps For All
* Sound Blaster Microphone Preamplifier
* Simple High Quality Preamp For Hi-Fi
* Hi-Fi Phono Preamp (RIAA Equalisation)
* Phono Preamp
* Vinyl Pre-Amplifier
* Simple High Quality Preamp For Hi-Fi
* Low Voltage Preamplifier
* Audio Pre-Amplifier
* Simple microphone preamplifier
* Phono Preamplifier
* Audio preamplifier circuits
* Preamplifier
* Single ic preamp
* Stereo preamp
* Microphone pre-amp
* One transistor Audio Preamp
* All transistor microphone pre-amplifier
* Hi quality Phono Preamplifier
* Audio Line preamp Driver
* Stereo Preamplifier with adjustment tone
* Moving Coil Head Pre-preamplifier
* A Buffered Headphone Driver
* Three Tube PHONO (RIAA) Preamplifiers with ECC83
* Low Voltage Preamplifier
* Stereo Preamplifier with Bass-boost
* Audio Line High-End Preamplifier with ICs
* Low Noise Microphone Preamplifier
* Modular Class A Buffer preamplifier
* Phono Preamplifier
* ECM Mic Preamplifier
* ECM Mic Preamplifier
* Phono Preamplifier
* Modular Audio Preamplifier
* Simple microphone preamplifier
* Single IC Audio Preamplifier
* Intercom preamp - Universal high quality preamp
* Sound Blaster Microphone Preamplifier
* Phono Preamp
* MASTHEAD PREAMP
* High-End Audio Modular Preamplifier
* Phono RIAA Preamplifier
* Portable Microphone Preamplifier
* A Precision Preamplifier-Power Amplifier System
* Simple Stereo Electret Microphone Preamplifier
* Modular Preamplifier with IC Class A
* Audio Preamplifier with Digital Volume
* Minimalist Discrete Hi-Fi Preamp
* Phono RIAA Preamplifier
* Symmetrical Audio Class A preamplifier
* Hi-Fi Preamplifier
* RIAA Phono Preamp
* Hi-Fi Preamplifier
* Audio Line Driver
* Portable Microphone Preamplifier
* Stereo Preamplifier with Bass-boost
* Stereo Preamplifier with Bass-boost
* Dynamic Microphone Preamp
* Phono Preamplifier
* Tube Line Preamplifier Project
SKEMA TONE BALANCE * Digital Volume Control
* Digital Volume Control with DS1669
* Bass-treble, Volume, balance and Loudness control
* 2nd Order Opamp Filters
* Low-Sensitivity, Lowpass Filter Design
* Low Pass Filter
* DC accurate low-pass filter
* Galaxy Noise Filter Schematic
* Subwoofer Low pass filter
* Audio stereo Panner
* Panner Waveform Generator
* Active SubWoofer
* Feedback Bandpass Filter
* Audio Tone Control
* Auto Loudness Control
* 60-Hz, High-Q notch filter
* Active Tone Control
* 12dB / Octave Linkwitz Riley Crossover
* Filter For Audio Measurements
* Bass -Treble Tone Control
* TDA1524 Stereo Tone Control
* Tone Control Schematic
* low pass filter subwoofer
* Equal-element filter improves passband performance
* Single Op-Amp Bandpass Filter
* Highpass filters use modified equal-element design
* Parametric And Sub-Woofer Equaliser
* Battery-Powered Stereo Balance Control Features Low Distortion
* Stereo Width Controllers
* Active Filters: High Pass
* 3KHz LOW PASS FILTER & AUDIO AMP
* Cascade bandpass filters for higher Q
* Bandpass Filter
* Band-pass filters
* Tone Control Circuit
* AUDIO AMP 3KHz FILTER
* 3KHz LOW PASS FILTER PLUS AUDIO AMP
* Closing the loop deepens notches
* Tiny 1MHz Lowpass Filter Uses No Inductors
* LowPass Filter
* ELECTRIC FIELD DISTURBANCE MONITOR
* High Q Notch Filter
* Stereo Width Controller
* Active Sub-Woofer and Controller
* Hum filter
* 20 Hz audio bandpass filter
* Adjustable high-frequency notch filter
* Adjustable filter provides lowpass response
* Tone Control
* Bass-treble tone control circuit
* Lowpass filter uses only two values
* Audio Notch Meter
* LOW PASS ACTIVE FILTERS
* Schematic of Low-Pass Active Filter
* "Brick-wall" lowpass audio filter needs no tuning
* Active filter has wideband tuning range
* Lowpass filter has improved step response
* Multiple Feedback Bandpass Filter
* Bass-treble tone control circuit
* RC Notch Filter (Twin T)
* Guitar Tone Control
* DPPs program key parameters of bandpass filter
* Baxendall Tone Control
SKEMA EQUALIZER : * Graphic Equalizer
* 10 Band Graphic Equalizer
* 3 Band Equalizer
* 6-Band Graphic Equalizer
* Stereo Equalizer and Balance
* Parametric and Graphic EQ's
* Spectrum Analyzer and Equalizer
* Subwoofer Equaliser
* 3 Band graphic equalizer
* Parametric SubWoofer Equaliser
* Reverse RIAA Equaliser
* Subwoofer Equaliser
* 10 Band Audio Equalizer
* RIAA Phono Equaliser
* 10 Band Audio Equalizer
* 5 band graphic equalizer using a single IC/chip
* Better Volume (and Balance) Controls
* Digital-Controlled Graphic Equalizer
* 5 Band Graphic Equalizer
* Parametric MID Frequence EQ
* 10 Band Graphic Equalizer
* Audio Graphic Equaliser
* A Pocket Equalizer For Headphone Listening
* 6-Band Graphic Equalizer
* 3 Band graphic equalizer
* (Expandable) Graphic Equaliser
* Ibanez Graphic Equalizer
* Electro Harmonix Graphic Equalizer
* 6-Band Equalizer
* Graphic Equaliser 527
* Graphic Equaliser 533
* Graphic Equaliser 545
* Graphic Equaliser 537
* 5 band graphic equalizer using a single IC/chip
SKEMA MICROPHONE * 2Channel Microphone Stereo Mixer
* Op-Amp Microphone Preamp
* Portable Microphone Preamplifier
* Dynamic Microphone Preamp
* Computer Microphone preamp
* Portable Microphone Preamplifier
* Computer Microphone Schematic
* Condenser Microphone amp
* Dynamic Microphone Preamplifier
* Dual microphones separate voice from noise
* Dynamic Microphone driver circuit
* Electret Condenser Mic Preamplifier
* dish microphone
* Balanced Microphone Preamp
* Bionic Ear
* Speaker Microphone Circuit
* Sony C-37A Condenser Microphone
* Portable Mic Preamplifier
* Audio Perimeter Monitor
* Microphone uses phantom power
* The Simplest FM Mic
* Microphone pre-amp
* Low impedance microphone amplifier
* Microphone Voice-Over Circuit
* Underwater microphone
* 24 Watt Audio Amplifier
* Speaker Microphone
* Mike Pads
* Balanced Microphone Preamp
* electret mike amp
* simple mic preamp
* 100 - 108 Mhz Wireless Microphone
* Line level to microphone input adapter
* Condenser mic audio pre-amplifier
* Microphone Clap Switch
* Electret Microphone Preamplifier
* Loudspeaker as a Microphone
* Simple microphone preamplifier
* Mic Phantom Supply
* Low Noise Microphone Preamp
* Interfacing Pro Microphones to Computer
* Low impedance microphone amp
* FM Wireless Mic
* Spy-Mic with FETs
* TTL Mic-spy
* Shortwave Mic
* Mic Circuit Test Oscillator
* Simple Microphone Mixer
* Microphone Polarity Tester
* MINIATURE FM SPY MIC
* POP free mic on/off circuit
* Simple microphone pream
* Mini Microphone preamplifier
* MIC SPLITTERS
* Powering microphones
* Dynamic to electret microphone circuit
* Preamplified Wireless Mic
SKEMA MIXER * 4 input Portable Mixer
* 1 Transistor Audio Mixer
* two line output combiner
* Headphone driving for soundcards
* 2 CD-ROM drives to one soundcard
* Isolator transformer for audio lines
* Stereo Audio signal Isolator
* Hi Fi mini mixer
* 3 input audio Mixer
* 4 lines Stereo Mixer
* Audio Line Driver
* 2 lines FET Audio Mixer
* Speaker signals to line inputs
* line mixer
* Audio Modular MIXER with 6 and up input Channel
* 6 Input Mixer
* Mini Mixer Project
* Simple Line Mixer and Patchbay
* Portable Mixer
* Elevon Mixer for Transmitters
* 6 Input Mixer
* Voice-Over Circuit
* Six-channel Mixer and Amplifier
* High Quality Audio Mixer
* FET Audio Mixer
* Microphone Mixer
* Stereo Mixer
* 3 Line Mixer
* Simple line mixer
* Voiceover Schematic
* Audio Mixer - Transistorized
* Stereo Mixer Schematic
* 3 Line Mixer
* 2 Line Mixer
SKEMA VACUM TUBE : * ZUPER POWER AMPLIFIER
* Vacuum Tube Preamp
* 15 Watt Valve Amp
* Tube Amplifier Schematic
* Class A Amp with 5687 dual triodes
* Phono tube Preamp
* Class A2 SV811-10 Stereo Amp
* Vacuum Tube Theremin Schematic
* 845 20W A1 class monotriode amplifier
* A class and push-pull
* Tube Headphone Amplifier
* 60 Watt Tube Power Amplifier
* 2x45 Watt Tube Amplifier
* Push - Pull 24 Watt A Class Amplifier
* Push-Pull Class A 2A3 Stereo Amp
* 15 Watt Tube Amplifier
* CLASSIC MINIMALIST AMPLIFIER
* Pushpull Amp
* Tube dual opamp
* The Emperor's New Amplifier
* 500KW Transmitter Schematic
* Transmitter FM 45W with valve
* 3 - 5 Watt Class-A Audio Amplifier
* Tube power amplifier 5W with EL84
* Headphone tube amplifier
* Tube - Mosfet Opamp
* Tube Line Preamplifier Project
* CAR TUBE PRE AMPLIFIER
* Stereo Tube Amplifier
* 600 VOLTS POWER SUPPLY FOR QRO
* Phono Preamp
* Three Tube PHONO (RIAA) Preamplifiers with ECC83
* HF BANDS QRP LINEAR AMPLIFIER
* 2 VALVE TRANSMITTER
* Single Valve Transmitter
* OBTAINING 250vDC & 6.3vAC FOR VALVES
* Stereo Tube Amplifier
* 2a3 Tube Amplifier
* Vox AC 50/4 Amplifier
BUZZER SCHEMATIC : * warbler siren
* Two-tones Siren with IC 4093
* Proximity Alarm
* Door Chime Schematic
* Siren Generator Schematic
* Doorbell for the Deaf
* Electronic Doorbell with Counter
* Frost Alarm
* warbling sound alarm
* Doorbell Chime
* door-chime repeater
* Over Voltage Beeper
* simple electronic buzzer
* Novel Buzzer
* Controller provides multiple alarm-driver formats
* Birdie Doorbell Ringer
* Cuckoo-song Generator
* DING-DONG BELL
* Two tone generation
* 555 Tone Generator
* Novel Buzzer
* Ultrasonic dog whistle with 555
* Siren
* Timed Beeper
* Whistle Responder
* You've got mail
* VERY LOUD BEEPER CIRCUIT
* MACHINE POWER LOSS BEEPER
* Pushbutton Activated Beeper
* POWER REMINDER BEEPER
* Piezoelectric Triggered Switch
* Piezoelectric Vibration Sensor Activates Switch
* BASEMENT DOORBELL BEEPER
* LOUD PIEZO ALARM BEEPER
* Check Engine Beeper
* Beeper
* Bells ring Generator
* simple electronic buzzer
* Siren Driver Circuits
* Audio Millivoltmeter
* Battery Low Voltage Beeper
* BASEMENT DOORBELL BEEPER
* Bull Horn Schematic
MUSICAL SCHEMATIC : * Multi-Melody Generator with Instrumental Effect
* CD-ROM Drive as Digital-audio CD-Player
* Simple Electronic Metronome
* Surround Sound Decoder
* Vocal Zapper
* compressor Effects circuit
* Instrumental visual feedback
* Guitar Reverb
* Guitar Reverb Pedal
* Stereo Synthesizer
* Metronome with CA741
* Sound Effects Generator
* Sound Effects Generator 2
* Tone Generator with 555
* Precision Metronome/Pitch
* Panner Waveform Generator
* Guitar Reverb Effect
* CW Sidetone Generator
* Guitar Reverb II
* Phase Shifter circuit
* Analog Synthesizer Module
* Direct Injection Box for Recording & PA
* 8 Note Tune Player
* RHINO8 EL Sequencer
* Guitar Tremolo Unit
* Metronome Circuit
* Instrumental Graphic Equaliser
* Mini Metronome
* Melody generator for greeting cards
* MIDI Controller Footpedal
* Guitar "wah-wah" Effect
* Guitar tone Control
* Guitar Reverb Effect
* Mini-Synth Guitar Trigger
* Bass Guitar Compressor
* Wave Multiplier for music synthesizers
* Mobile MP3 Player PC
* MUSICAL BELL
* Spring Reverb Unit
* Musical touch bell
* Hot Springs Reverb
* Precision Metronome
* one transistor theremin
* Voltage Controlled Panner
* Guitar Vibrato circuit
* Audio Voltage divider
* Electronic metronome
* Fuzz-box circuit
* WAH & FUZZ Guitar circuits
* 60W Guitar Amplifier with tone control
* 100W/4 Ohm Guitar Amplifier
* Bass 10W audio Amplifier
* Electric Guitar Hookup
* Atmel 2323 Digital Guitar Tuner
* 300W Subwoofer Amplifier
* Guitar Reverb Pedal project
* Guitar Effect Bypass Circuit
* Serial MIDI Interface
* timer remembers your rhythm
* spring reverb plans
* MIDI Drum Machine
* Portable Guitar Amplifier
* Car PC MP3 Player
* Guitar Amplifier
ULTRASONIC : * Ultrasonic Pest Repeller circuit
* All transistor microphone pre-amplifier
* Tone Generator with 555
* Ultrasonic dog whistle with 555
* Ultrasonic Pest Repeller
* Practical UltraSonic Radar
* UltraSonic Switch
* "Good old" parking sonar
* remote control and Intruder detector
* Ultrasonic Switch
* Electronical Cricket
* Almost Ultrasonic Motion Sensor
* UltraSonic Radar
* Almost Ultrasonic Motion Sensor
* Basic IR Detector/Emitter
* Ultrasonics: remote control and Intruder detector
* 40khz IR tester
* UltraSonic Radar
* Sampling peak detector has shutdown feature
* Ultrasonic Range Meter
* Devantech SRF04 Interface to BrainStem GP 1.0
* ULTRASONIC EXAMPLE
* Ultrasonic Range & Imager
* Ultrasonic Range Meter
* Ultrasonic range finder
* UltraSonic Radar
* ultrasonic switch
INTERKOM : * High Quality audio Intercom
* Doorphone Intercom schematic
* Full-duplex Intercom project
* Transistorised Intercom
* 2-Way Intercom
* 4-Way Intercom
* old phones as intercom circuit
* old phones as an intercom with ring tone
* Practical Intercom Circuit
* 2-Line Intercom Telephone Changeover Circuit
* The Link Telephone Intercom
* Party line intercom circuit
* Intercom preamp
* 10 channels Intercom circuit
* Headset type Intercom
* Two line intercom
* Doorphone Intercom
* Intercom
* IR headphone transmitter CD4046
* Infrared Head Phones
Mon Dec 07, 2009 5:47 am gwendy