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
