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  • Pink noise generator
     
  • A Schottky-based Saw-to-Tri converter
     
  • Saw to triangle converter
     
  • Improved saw to triangle converter
     
  • Voltage controllable LFO
     
  • White noise generator
     
  • Low Frequency Sinewave Generators
     
  • Horror movies sound effects
     
  • Sound amplifier
     
  • Temperature sensitive oscillator
     
  • Twin-T Audio Sine Wave Oscillator
     
  • 1.5V Audio Amplifier
     
  • Low Power Op-Amp - Audio Amp (Intercom)
     
  • 555 Tone Generator (8 Ohm Speaker)
     
  • 3 Transistor Audio Amp (50 milliwatt)
     
  • Low Frequency Sinewave Generator
     
  • Automatic Charger for Battery Operated Hi-Fi Preamps
     
  • Audio level indicator
     
  • Room noise detector
     
  • Amplifier timer
     
  • Bell ring generator
     
  • Amplified ear
     
  • Precision audio millivoltmeter
     
  • Six-channel Mixer and Amplifier
     
  • Audio Signal Source
     
  • Analog VU meter
     
  • Voltage controlled amplifier
     
  • Audio graphic equaliser
     
  • Intercom preamp
     
  • FET audio mixer
     
  • Microphone mixer
     
  • Tone control
     
  • Digital volume control
     
  • Sound level meter
     
  • CMOS IC audio oscillator
     
  • Ultrasound detector
     
  • Electronic siren
     
  • Two-tone siren
     
  • Underwater microphone
     
  • Code practice oscillator
     
  • Noise generator
     
  • Electronic whistle
     
  • Three band Active Tone Control
     
  • Automatic gain control (AGC) circuits
     
  • Audio frequency meter
     
  • Bull Horn
     
  • Sound Mixer/Amplifier
     
  • Very loud beeper (PDF)
     
  • Digital noise generator (PDF)
     
  • Tone display system
     
  • Tube amplifier
     
  • Condenser microphone hookup
     
  • Phase shifter
     
  • Paradoxical Sound Syntheizer
     
  • Various tube crossover circuits
     
  • Bias circuits
     
  • Audio line isolator
     
  • Dynamic microphone to electret microphone input
     
  • Line level signal to microphone input adapter
     
  • Simple two line output combiner
     
  • Electret microphone powering circuits
     
  • Use amplifier phono input as line level input
     
  • Speaker signals to line level inputs
     
  • Spring reverb unit
     
  • Sine wave generator
     
  • Simple amplifier
     
  • 3-Band equalizer
     
  • 6-Input mixer
     
  • Doorphone intercom
     
  • Stereo line driver
     
  • Audio notch filer
     
  • Peak reading audio level meter
     
  • Tone control
     
  • Speaker Microphone Circuit
     
  • Electronic canary
     
  • Electronic siren
     
  • Microphone phantom power supply
     
  • NHT subwoofer amp
     
  • Voltage Controlled Mixer w/Modulator
     
  • Dual Voltage Controlled Oscillator w/Modulator
     
  • Dual Voltage Controlled Filter w/Modulator
     
  • Stereo Ducker
     
  • MS Stereo Decoder
     
  • MS Stereo Microphone
     
  • RIAA Equalized Stereo Phono Preamp
     
  • Tube active crossover
     
  • Improved PL tone decoder
     
  • Magnetic cartridge amplifier
     
  • LM358 preamp
     
  • Sound detector
     
  • Tone detector
     
  • Tone generator
     
  • Warbler
     
  • Fender Champ Replica
     
  • Keyboard scanned 8-tone generator
     
  • Audio test station
     
  • Audio tone VU meter
     
  • Pink noise generator
     
  • Voltage Controlled Panner
     
  • Low Noise Microphone Preamplifier
     
  • Bridging Adapter For Power Amplifiers
     
  • Simple Surround Sound Decoder
     
  • Simplest Ever Amplifier Bridging
     
  • Stereo Width Controllers
     
  • Power Amplifier Clipping Indicator
     
  • Phono Preamps For All
     
  • Digital Delay Unit For Surround Sound
     
  • Parametric And Sub-Woofer Equaliser
     
  • High Quality Sound Mixer
     
  • Loudspeaker Protection and Muting
     
  • Direct Injection Box for Recording & PA Systems
     
  • Minimalist Discrete Hi-Fi Preamp
     
  • Signal Detecting Auto Power-On Unit
     
  • Load Sensing Automatic Switch
     
  • Amplifier thermal protection
     
  • Active Sub-Woofer and Controller
     
  • Balanced Line Driver & Receiver
     
  • VU And PPM Audio Metering
     
  • Variable Amplifier Impedance
     
  • Linkwitz Cosine Burst Generator
     
  • Low Noise Balanced Microphone Preamp
     
  • Fast Audio Peak Limiter
     
  • Subwoofer Equaliser
     
  • 110 dB beeper - 74C14
     
  • Audio output level meter
     
  • Surround Sound Decoder Mk2
     
  • Stereo compressor
     
  • Audio mixer
     
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