CommLinx Solutions Pty Ltd - GPS Tracking Systems A.B.N. 92 099 086 307 Technopark Block 7 Unit 2 Innovation Drive, Dowsing Point Tasmania Australia 7010

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GPS tracking system The new GPRS Cube GPS tracking system is ideal for GPS vehicle tracking or any application where a small battery powered GPS tracking system is required. Based on the GPRS packet data network costs are much lower than GSM SMS or GMS data based GPS tracking systems. Being fully self-contained it is also ideal for recovery of stolen assets that don't have their own power source such as machinery, shipping containers and building supplies. Note that all these links are external and CommLinx Solutions can provide no support on the circuits or offer any guarantees to their accuracy. Also note that some of the circuits are illegal to operate in most countries, please check your local regulatory bodies if concerned. Other circuits are dangerous to construct and should not be attempted by the inexperienced. Total schematics: 1901 Last updated: 14-August-2004 Alarms and security related schematics Proximity alarm Electronic lock Electronic door codelock (PIC16F84) Moisture alarm Fridge door alarm Ultrasonic remote control & alarm system Wire loop alarm Digital entry lock Proximity switch Toxic Gas Detector Door knob alarm (PDF) Water seepage alarm (PDF) Micro-power over temperature alarm (PDF) Personal silent alarm system Active IR motion detector A Basic RF Transmitter for PIR Sensors PIR motion detector Simple alarm system Automatic door opener using PIC12C508 Home security project 5 Zone alarm circuit Miniature loop alarm Novel Buzzer Gate alarm circuit Modular Burglar Alarm Motorcycle alarm Enhanced 5 Digit Alarm Keypad Enhanced 4 Digit Alarm Keypad RF Alarm Single Zone Alarm Water Activated Alarm Water level alarm Perimeter monitor Digital combination lock Alarm control keypad Almost Ultrasonic Motion Sensor Touch activated alarm system Combination Lock (PIC16F84) Low power RFID transponder Audio power amplifier schematics Two transistor audio amplifier Personal stereo audio amp Headphone amplifier 1.5W Audio amplifier Low-level audio amp 10W amplifier 80W amplifier LM383 12V Amplifier 100W Amplifier 18W Audio amplifier 25W MOSFET amplifier Headphone amplifier Portable headphone amplifier 2W amplifier 4W amplifier 8 watt audio amp 20W Amplifier 50W Amplifier 100W Audio amplifier 100W RMS Amplifier 2-Channel Power Amplifier Push-Pull Class A Amp using type 5687 dual triodes Push-Pull Class A 2A3 Stereo Amp Single Ended Class A2 SV811-10 Stereo Amp Audio amplifier output relay delay Spatial Distortion Reduction Headphone Amp HeadBanger Headphone Amp 2W Amplifier TDA2030 8 Watt amplifier Headphone distribution amp Headphone monitor amp 50W audio power amplifier Bi-Directional 2.4 GHz One Watt Amplifier Bi-Directional 900Mhz One Watt Amplifier 20 Watt GaAaFET Power on 2.3 GHz 1 Watt 2.3 GHz RF Amplifier Using a MRF2001 2.3 GHz Power Amplifiers 2304 and 3456 MHz Power Amplifiers High quality exponential VCA 16 Watt amplifier 8 Watt amplifier Power amp schematic (PDF) 20 Watt Class-A Power Amplifier El-Cheapo - A Really Simple Power Amplifier Single Chip 50 Watt / 8 Ohm Power Amplifier Hi-Fi Headphone Amplifier 100W Guitar Amplifier Death of Zen (DoZ) - A New Class-A Power Amp Soft-Start Circuit For Power Amps Thermo-Fan To Keep Your Amp Cool Audio Amp Output Power Limiter 55W (Originally 75W) Power Amplifier 300W Subwoofer Power Amplifier 20 Watt / Channel Stereo Power Amplifier Mini bench amplifier (LM386) 12 Watt Valve Guitar Amp Audio preamp circuits Microphone amplifier RIAA phono amplifier Low impedance microphone amplifier Dynamic microphone preamplifier Phono preamp Masthead preamp Preamplifier for microphone or guitar use Simple microphone preamplifier Tube microphone preamp Simple Stereo Electret Microphone Preamplifier Simple Stereo Electret Microphone Preamplifier Phono Preamp Simple microphone preamplifier ECM Mic preamp Hi Fi preamp Balanced microphone preamp Audio preamp Electret mic amplifier Audio preamplifier Vacuum Tube Microphone Preamp FET Preamp Cable Audio preamp Automative, car and motorcycle schematics Electronic auto stethoscope Turn signal alarm Motorcycle turn-signal system Cigarette lighter 9V adaptor Analog Tachometer for Gasoline Engines Headlight On reminder with Light Adaptive Windscreen Wiper Control Car clock Car message display Car interval wiper Safety indicator light Speed limit alert Grand Cherokee Off-Highway Lights Engine control unit schematics Portable CD Player Adapter For Car Car battery charger Wireless Auto Tachometer Alternator Signal Detector Automotive alarm system Road ice alarm Automotive Anti-Lock Brake Control Driver Headlight reminder Breath Alcohol Tester controlling a car ignition system Simple car battery charger Parking sonar Fuel injector pulse width monitor BMW R Series Motorcycle Regulator Schematic 80188XL Engine Tachometer Integrate Fuel Pump Wire Security Cut Off with a Turbo Timer Simple Car Preamplifier and Artificial Earth FCD (Fuel Cut Defencer) Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port 5301 wideband fuel mixture display Wide Band Fuel Mixture Display 3rd brake light 12V to 9V car coverter Car Nicad charger Combination lock for car liftgate BMW motorcycle side stand protection mod Data acquisition and data logging schematics Air flow detector Air flow detector Strain gauge sensor Digital Water Wave/Tide/Level Meter (PIC16F876) Self made data-logger V2.5 (second edition) Magnetometer Analog input section based on AD9220 uModem 4+4/8 channel A/D board ADXL202 accelerometer to CV output Light direction sensor 12-Bit ADC interface Digital thermometer Universal flight controllers / datalogger Rain detector Home Brew Compass Sensor Using 555 Timer as an A/D converter ADC0804LCN 8-bit A/D converter Web-based thermometer project Low Flow-Rate Thermal Flowmeter Geiger counter Differential Capacitance Measurement for Tilt Meter Honey Bee counter (PDF) Capacitance type liquid level measurement (PDF) Thermostat node schematic Digital PC Oscilloscope Ultrasonic Range & Imager Precision Digital Altimeter Digital compass schematic Temperature datalogger Serial Port A/D-converter Centronics port D/A converters and low-pass filter LCD Thermometer Acceleration monitor using Analog Devices ADXL202 Optical sensor using PIC12C508 Wireless Liquid Level Sensing for Restaurant Applications Accelerometer Schematic Pressure Sensor-Based Altimeter Circuit Ultrasonic range finder circuit 1-wire barometer Water-level sensor Addressable ADC Electronic altimeter using PIC16F877 Wireless weater station Filter schematics Galaxy Noise Filter Low-pass active filter Filter Circuit for the Earthworm Seismic Data Acquisition System Active 2nd Order Filters RC Notch Filter (Twin T) Multiple Feedback Bandpass Filter CW filters Self-tune filter SSB AF filter Helical Resonator Notch Filter 3KHz low-pass filter plus audio amp (PDF) Active bandpass filters Bandpass filters Butterworth filters Narrow band audio bandpass filter Inversal notch and bandpass filter DC Accurate, Active RC Lowpass Filter Chebyshev Bandpass Filter Bandpass filters Chebyshev / Butterworth filters Biquad Active Bandpass Filter Schematic "A" Weighting Filter For Audio Measurements Multiple Feedback Bandpass Filter Digital signal processor (DSP) for radio communications 29.85 MHZ bandpass filter schematic 29.85 MHZ notch filter schematic LC filter design Games and fun stuff (schematics) Mechanically scanned video game system Visor cradle serial interface Electronic coin tosser Electronic craps game First response monitor VCR ping pong game Video ping pong game MBC5/CPLD for the GameBoy GameBoy Camera Parallel Port Interface Mobile robot (PDF) PSX controler to PC MIDI converter Dreamcast PC serial adapter GameBoy Cart Programmer Memory game 32 Kb x 8 emulator for the GameBoy Project: NES to Atari 2600 controller interface Battery Meter for Pinball Machines SRX1 (Stephane's Robotic eXperiment 1) Pine Racecar Victory Judge Interfacing Sony control stick to Empeg Electronic Nicad glow plug driver April Fools LEDs Pinewood Derby logic Quiz Master GameBoy Schematic GameBoy LCD schematic GameBoy Power & Cartridge schematic GameBoy ROM+RAM+MBC1 Cart Schematic GameBoy MBC1 circuit equivalent Super GameBoy schematic Quiz show indicator Dreamcast interface Bingo!!! (on your tv) Slot car TV cronograph Furby reverse-engineered circuit Sanyo 20EZ monitor Arcade Game (300k ZIP) Burger Time Arcade Game (500k ZIP) Dig Dug Arcade Game (800k ZIP) Frogger Arcade Game (500k ZIP) Galaga Arcade Game (542k ZIP) Gyrus Arcade Game (800k ZIP) Junior Pacman Arcade Game (400k) Ladybug Arcade Game (335k ZIP) Mappy Arcade Game (470k ZIP) Moon Cresta Arcade Game (300k ZIP) Mr.Do Arcade Game (554k ZIP) PacLand Arcade Game (316k ZIP) Pengo Arcade Game (313k ZIP) Q*Bert Arcade Game (600k ZIP) Qix Arcade Game (476k ZIP) Scramble Arcade Game (600k ZIP) Time Pilot'84 Arcade Game (870k ZIP) Xevious Arcade Game (450k ZIP) Magic Wand Conjuring Trick Quiz game circuit E.S.P. Conjuring Trick Video game system using PIC18F252 (direct video generation) Video game system using SX28 (direct video generation) DIT shutterglasses controller Tic-tac-toe game using PIC16F628 Archery timer PIC micro Tetris game Magic lamp, IR remote control jammer and other fun circuits (PDF) Lego Mindstorms Double Rotation Sensor Infrared based schematics IR detector Infrared body heat detector Stereo IR audio receiver General purpose IR receiver Wireless IR headphone transmitter Wireless IR headphone receiver Infrared remote control shutter release system Infrared transmitter for locomotives Infrared gate for door Infrared circuits for remote control Serial port controller infrared transmitter (PIC16F628) IR Receiver (Amplitude Modulated IR) IR Transmitter for Audio (Amplitude Modulated IR) Digibox interface IR remote control Long Range Infrared Remote iRDA to TTL interface 40KHz light receiver (PDF) 40KHz TV-VCR repeater (PDF) Micro based PIR to IR remote converter IR-related ASCII Schematics V1.00 Infrared remote transponder Build an Infrared night scope Decoding IR Remote Controls IR detector PC IR Remote Control Hardware PC IR Remote Control An Ambient-Light-Ignoring Infrared Active Motion Detector Infrared Transmitter and Receiver schematic diagrams Pyroelectric Infrared Sensor Minimal Infrared transmitter for PC Simple IR transmitter circuit Simple infra-red detector AVR (AT90S2313) serial port infrared receiver Infra Red Switch IR remote control extender IR Remote Control Extender Circuit (Mark 2) IR Remote Control Extender Circuit (Mark 3) IR Link IR remote control tester 40khz IR Tester 555 timer 40khz IR Oscillator IR detector / emitter Fire-Stick infrared remote control Simple infrared remote control Infrared / Ultrasonic beacon Implementing Infrared Object Detection IR detector for robotics Computerized Infrared Remote Laser related power supplies and data transmission Light beam receiver for laser pistols 12V supply for He-Ne laser Laser diode transmitter Laser power supply Laser transmitter/receiver Laser harp Laser Telephone Receiver Circuit Fiber Optic Voice Communications Efficient Laser Supply 20MHz VCSEL 3mW laser test circuit (PDF) 10MHz to 20MHz laser light detector (PDF) Micro-power 40KHz burst laser diode driver (PDF) 40KHz laser burst detector (PDF) Modulated laser diode tester (PDF) Ar/Kr Ion Laser Power Supply Laser diode power supply circuits RS-232 Laser Transceiver HeNe laser power supply OPT201 Laser receiver OPT301 Laser receiver Laser transmitter schematics Diode Laser Power Supplies Laser bug circuit RS-232 Laser Transceiver Experimental laser data link Ar/Kr Ion Laser Power Supply Design Simple laser communicator LED related schematics Big 7-segment LED display board with SPI interface LED Flasher LED pulser with audible output IR Illuminator Flashing Christmas LED display ICL7660 LED flasher LM3909 replacement using discrete components Color fade LEDs shimmer randomly as though on fire LED power supplies for AA cells 1.5 Volt LED Flashers AC Line Powered LEDs Astable Multivibrator 9 Second Digital Readout Timer 9 Second LED Relay Timer 16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits 10 Stage LED Sequencer 28 LED Clock Timer Fading Red Eyes Two Transistor LED Flasher 16 Stage Bi-Directional LED Sequencer Expandable 16 Stage LED Sequencer LED Photo Sensor Circuit LED chaser 7 Segment LED Counter 7 by 10 LED Moving Sign ( 27C512 EPROM) Sequencial LED Flasher with Reversable Direction Tri Color LED Controller with Serial Interface 1.5V LED flasher B (PDF) Low current LED flasher (PDF) 1.5V LED flasher A (PDF) Flashing LED advertising badge (PDF) Flashing LED advertising badge (PDF) Pulsed LED test circuit (PDF) Low battery voltage flasher (PDF) Adjustable flashing LED PWM white LED drivers Heart of LEDs Christmas Star Christmas tree LED Counter PIC16F84 LED chaser PIC16F84 LED signboard PIC16F84 LED signboard 2 White LED circuits Assorted LED circuits LED Mood Light LED Audio VU Meter Robot Beacon rotating light using PIC12C508 LM3909 LED flasher Animated LED signboard (PIC16C84) Picxie 2 - 8x8 Animated LED Signboard Lighting schematics Garden light switch DMX lighting and special effects Microcontroller Multichannel Light Dimmer Digital timer light switch Hand clap lamp control Radio controlled light switch Disco style Strobe Light Varying Brightness AC Lamp 12 Volt Lamp Dimmer 120VAC Lamp Chaser Using Solid State Relays Flashing Neons (NE-51 / NE-2) Sequencing Neons (NE-51 / NE-2) Touch Activated Lamp 220V Flashing lights Coutesy lamp Bedside lamp timer TRIAC light dimmer 12VDC Fluorescent Lamp Driver Strobe light Adjustable Strobe Light RHINO8 EL Sequencer Light Sequenced Candelabra Light timer 5W Fluorescent light intensity modulator (PDF) 1W Fluorescent lamp night light (PDF) Low-voltage light dimmer Light chaser 4-channel dimmer rack PIC16F873 light controller Disco light controller Neon desklamp Electronic night light Neon lamp dimmer LED Mood Light LX-800 Lighting system Xenon Strobe Light Lamp flasher/dimmer Medical and health related schematics Snore alarm electronic device Heartbeat transducer ECG Amplifier EKG/EEG circuit Radiation Dosage-Rate Meter Heartbeat monitor Cranial Electrotherapy Stimulator Automated crib lights Jogging timer Tan timer Muscular Bio-stimulator Pedometer Simple lie detector EEG preamp, anti alias filter and isolation circuit Self Contained Electromyograph (EMG) Cardiac monitor Galvanic Skin Response (GSR) Schematic Brain-Wave Machine Lie detector Simple lie detector ECG project page The ESP SIM (Sound Impairment Monitor) Respiration system Microcontroller based schematics PIC based packet radio encoder (PDF) RS485-Version of the SAB80C535-Microcontrollerboard PC IR receiver based on PIC16F84 Record and play fast 1-bit sound on a PIC micro AT89C2051/4051scanning 7-segment display and keypad AT89C2051/4051 Driving dot LED AT89C2051/4051stepper motor interface AT89C2051/4051connecting dumb terminal Motorola 68K SBC (single board computer) 8051 SBC (single board computer) Simple RS232C Level Converter using Transistors Motorola 68HC11 evaluation board C-52 EVB Robot Controller Mains clock controller using AT89C2051 AT89C2051/4051 Easy-Downloader AT89C51/52/55 Easy-Downloader PIC16F84 programmer PIC16F84 miniature real-time controller Isolated RS232 for PIC16F84 PIC16F84 debugging terminal MiniLOGGER V1.0 Analog datalogger based on T89C51RD2 Atmel 89C Series Flash Microcontroller Programmer Atmel 89C2051 prototype board AT89C2051 real-time controller PIC12C508 Night-light saver AT89C2051 Night light saver Atmel 8051 Flash Based-Microcontroller Programmer AT89C2051 Digital thermometer and clock 4-Channel Timer using Atmel 89C4051 and MAX7219 display driver PIC16F84 CW decoder (PDF) 12C508 Smart Lock 80C31 stepper motor controller Build a PIC controlled DDS VFO, 0 to 6 MHz PIC controlled DDS VFO, 0 to 6 MHz Basic Stamp Lightning Activity Monitor Parallel AVR programmer PIC16F84 line following robot PIC16C505 IR / wireless remote control Automatic door opener with PIC12C508 RS485-like multi-drop bus with half duplex serial protocol WWWpic2 - A web server in a PIC PIC16F84 web server 50 MHz frequency counter, voltage meter & SWR/PWR indicator Microcontroller board using the Atmel AVR AT90S8535 Programmer PIC16F84,12C50x and EEPROM 24Cxx RDS Encoder - digital part PIC programmer for serial port Fully functional PS/2 mouse based on the PIC16F84 PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720) Freign vocabulary recollector Illuminate holiday destinations on a world map Embedded system to send e-mails (small TCP/IP stack) Speaking clock using PIC & ISD device Speaking doorbell using PIC & ISD device Whistle detector using 8-pin PIC PIXpand PIC16F877 to IDE interface 68HC11 stepper motor control 90S2313 AVR Robot Board POCSAG encoder/decoder Network Time Protocol AVR Clock DS1820 Temperature Sensor Readout Unit Rotating Sprocket Wheel Generator (PIC16F84) Talking PIC - based on SP0256 Serial to parallel converter using the AT89C2051 AT89C2051 serial COMs to LED driver PIC16F877 Programmer And Development System DS1820 Arbiter V2.00 Schematic Microchip PIC ICSP implementation 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU LCD Serial Terminal Propellor clock (PIC16F84) Optical sensor using PIC12C508 Interfacing S-7800A to PIC16F877 A Scenix (and PIC) Programmer MMC to PIC16F876 circuit diagram 8088 maximum mode SBC EZ80 single board computer schematic (Z80) 8051 Development System Circuit Board Voice recording and message retrieval system Interfacing a GPS to an LCD using a Microcontroller Long-period watchdog timer PIC16F84 Range Finder Project Generate video signals in real-time using a PIC16F84 PIC ICD PIC Project #1 - RS232 to I2C Interface Galvanic decoupling of I2C bus Programmer PIC16F84,12C50x and EEPROM 24Cxx Dual PIC16C84 prototype board Graphic LCD interface FSK modem with PIC16C84 Talking YODA project (PIC16C84) PIC16F84/PIC16F87x-In-System-Programmer Microcontroller interface for 5KW microwave oven Using an I2C Serial EEPROM with a Basic Stamp 2 PIC16F84 Based Morse Code Reader AVR-Based Serial Port IR Receiver Interfacing piezo elements to a microcontroller Victoria TAFE programmer (based on AT89C2051) JDM programmer PIC micro programmer Speech recognition using HM2007 PIC microcontroller servo motor interface PIC micro multiple servo motor interface PIC16F84 countdown timer PIC16F873 ultrasonic range meter PIC16F873 Digital clock PIC16F873 remote display PIC16F84 stepper motor controller Way small web server PICADC - a free, PIC based "intelligent" A/D converter 8051 development system circuit board 8088 maximum mode single board computer (SBC) Basic 89C2051 / 89C4051 circuit diagram Debugging dump terminal for 89C2051 designs Easy debugging terminal Galvanic decoupling of I2C bus Circuits interfacing piezo elements to a microcontroller Driving a TRIAC using a PIC12C508 Isolated RS232C for PIC16F84 Microchip ICD (in-circuit debugger) circuit diagram Microchip PIC ICSP implementation circuit diagram Interfacing NMEA GPS to LCD using PIC16F84 PIC ICD (in-circuit debugger) PIC16C71 morse code callsign generator PIC16F84 to LCD interface PIC16F84 I/O expander with PicBasic Scanning 7-Segment & Keypad 10-key serial keypad encoder Simple RS232C Level Converter using Transistors Talking PIC microcontroller using SP0256 PIC-Programmer 2 Connecting PIC12C508 8 to 93AA46 serial eprom KD7LMO Micro Beacon (PIC18F252) GPS LCD Display Project PIC16F84 LED chaser PIC micro LED projects PS/2 keyboard keystroke logger based on Atmel 89C2051 Electronic distance meter based on Motorola 68HC908QY4 Fan timer based on Motorola 68HC908QT2 Atmel AVR and 8051 series ISP programmer AT89C2051 line-follower robot Night light saver (PIC12C508) USB and GLCD expansion board for 8051 SBC Basic stamp interface circuits Microcontroller sensor and actuator interfaces Giant money counter (PIC16F876) PIC12C509 logic gate replacement for nitrogen filler PIC demo board PIC12C509 Gym Timer PIC LCD and Keypad driver PIC12C508 Phase Controller for 2kW heater PIC16F84 TRIAC / IGBT brightness phase controller PIC16F84 pulse monitor with date/time output (ZIP) Programmer for the 68HC705C8 MicroController 27c801 EPROM Programmer Project LCD to PIC16C54 schematic 68HC11 based RDS decoder Acceleration monitor using ADXL202 and AVR 40+ MHz 5-digit frequency counter with an AVR 2313 Interfacing DRAM to AT90S8515 Temperature monitor/controller: AVR 2313 / DS1621 PIC micro to ISA bus interface PIC16C84 VT-52 Emulator for Linux Microchip PIC ICD (in-circuit debugger) Tony Nixons Pocket Programmer (PIC) PicoWeb V5.1 (AT90S8515) tiny web server Atmel 89C2051 In-Circuit Programmer Schematic 8051 Development System Circuit Board 8051 Development System Circuit Board Microprocessor using Xilinx FPGA Temperature controlled based on AT89CX051 I2C LCD interface AFSK 1200 Modem based on PIC16C620 PicCon - Hidden Radio Transmitter Controller PIC16F84 tone generator with source code PIC16F84 tone generator PIC16F84 tone generator (6-Bit) AVR Beacon Super Keyer AVR Frequency Counter AVR Digital Voltmeter AVR Signal Generator Ser-Key 10-Key Serial Keypad Encoder 2-wire LCD interface using PIC16CF84 PIC16F84 Serial I/O-expander with PicBasic RS 485-RPT Schematic Camera remote control system using Basic Stamp Low cost Atmel in-system programmer Ultra low-cost programmer for AT90S family AVR to USB interface Programable LCD counter with memory backup based on Atmel AT90S1200A Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypad Atmel AVR RCEN fuse bit programmer Electronic safety lock based on ATtiny26 GSM SMS remote control using AVR microcontroller 128x64 LCD Driver for AT90S2313 (ZIP file) Connecting LED to PIC Micro I/O pins (PDF) Microprocessor RS-232 Reset AT90S8515 experimenter board Multi-chip programmer for PIC microcontrollers Buffered PIC chip interface A PIC-Based Keyboard Emulator PIC-based robot ScanMate audio activated recorded PIC vacuum fluorescent display interface PIC18F252 bootloader schematics PIC16F876 Datalogger GPS Repeater Kodak DC-20 camera interface (PIC12C509) Kodak DC-20 camera interface (PIC16F84) PIC ICD in-circuit debugger circuit diagram PIC programmers for parallel port Wisp628 ISP Microchip PIC Programmer WLoader - PIC16F877 application loader / bootloader Nixie clock (PIC16F876) Zilog Z80 thermostat embedded web server Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard 10 tricks for interfacing to the PIC16C508 Interfacing the PIC16C508 PIC 5x7 display Analog to digital conversion notes Multi-chip programmer Misc audio (also see Music, Amplifiers, Preamp) Electronic siren Two-tone siren Underwater microphone Code practice oscillator Noise generator Electronic whistle 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 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 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 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 Surround Sound Decoder Mk2 Audio mixer Miscellaneous schematics Ultrasonic radar Mobile APRS / GPS tracking system Electronic fish lure Ultrasonic sound receiver Experimental data transmitter for fiber optics Experimental fiber optic receiver Ion detector Darkness monitor Electroscope Simple event counter Search Engines   Lycos