Amplifiers Schematics
- 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
Stereo Schematics
- 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
Preamplifiers Schematics
- 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
Tone Balance Schematics
- 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
Equalizers Schematics
- 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
Microphone Schematics
- 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
Mixers Schematics
- 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
Vacuum Tubes Schematics
- 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 Schematics
- 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 Schematics
- 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 Schematics
- 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
Intercom Schematics
- 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
