Kumpulan Rangkaian Terapan Elektronika Audio

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