David Johnson & Associates, an engineering consulting firm, is committed to providing exceptional electronic.  Services include applications engineering and new product development. Improving the cost and performance of existing product is a specialty.  Our reputation is that we provide swift solutions to difficult engineering problems in innovative and cost effective ways.
                    "
Electronics is my vocation, hobby and passion.David A. Johnson, P.E.


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Sample of Products developed by Dave Johnson & Associates

Testers and Instruments
Control Systems
Medical Products
Alarm Systems
RF Systems

Sensors
Video Systems
Research
Optical Communications
Consumer Products

Testers and Instruments

  • High Frequency Analog Oscilloscopes and Plug-In Scope Modules
  • Power Line Tracers, inductive coupled, locates power lines behind walls
  • Power Line Tracers, inductive coupled, locates power lines
  • Computerized Data Collection System, for seismic studies, 60db dynamic range
  • Smoke Stack Pollution Monitors, NOx, and SO2 using optical adsorption techniques

TOP

Control Systems

  • Jail Door Controls and Monitors, intercom and lighting switches
  • Wind Power Generator Controls, using variable pitch propellers and wind speed monitor
  • Precision Lamp Light Intensity Controls, for photographic needs
  • 10 HP, 10 Pound Brushless DC Motor Controls, three phase 240vac
  • Solid State Relays, very low control current (50ua)
  • Vertical Lifting Type Security Gate Controls, single and tandem gates
  • Bathroom Shower Temperature Controls, butterfly valves and switched orifices
  • YAG Laser Welder Controls and Monitors, monitored and counted laser weld flashes
  • Diamond Impregnated Wire Saw Control Systems, motor controls, x-y indexing table
  • Museum Displays and exhibit control systems

TOP

Medical Products

  • Medical oxygen generation using micro sieve techniques, 94% oxygen from air
  • Medical Oxygen Delivery Controls, inhalation oxygen pulser
  • Medical Bowel Evacuation (Enema) Control System
  • Ultrasound air bubble detector for kidney dialysis machine (hold patent)
  • Medical CRT to Polaroid Film Camera Control Circuit, records ultrasound images
  • Full color X-ray displays using black and white photographic film system
TOP

Alarm Systems

  • Unplugged cord alarm, beeps when power is off or plug is removed from wall
  • Human motion detector using electric field fluctuations
  • Ultrasonic intrusion/motion alarms, 26KHz
  • Pulsated infrared active intrusion/motions alarms
  • Combustible gas detector/alarm using heated semiconductor sensors
  • Smoke detector/alarm, ionization chamber type using large electrets
  • Automotive and earth mover truck backup alarms, beepers
  • Electronic scare-crow using animal motion detector and white noise generator
  • Low current demand under voltage LED alarm/flasher
  • Micro powered over-temperature alarm, 3v battery powered
  • Car Jacking alarm system, 100s sold in New York City

TOP

RF Systems

  • Cordless RF telephones, also power line "carrier current" telephones
  • Home incarceration monitoring system, using radio linked leg bracelet
  • Through-wall data transmission research using inductive coupling, 6 foot range
  • Two pulse data transmission research using pulse position techniques, 2 bit accuracy
  • Low power 530KHz AM transmitter for "talking house"
  • Radio frequency identification devices (RFID), security access cards and readers
  • Beacon-type 915MHz and 2.45GHz RFID asset management tags

TOP

Sensors

  • Combustible gas detector using heated semiconductor sensor
  • Smoke detector, ionization chamber type using large electorates
  • Oxygen gas concentration monitor using speed or sound and silver/electrolyte methods
  • Smoke stack pollution monitors, NOx and SO2 using optical absorption techniques
  • Humidity monitors, ceramic capacitor type and cooled mirror
  • Ultrasound air bubble detector for kidney dialysis machine (hold patent)
  • Very low level air leak monitoring system, counted bubbles in water
  • Corona monitors for medical plastic surface treatment using optical fibers

TOP

Video Systems

  • Enhanced NTSC TV video signal processing circuits
  • CCD (charged coupled device) camera system for identifying horses
  • Video processing X-Y laser hit position for firearm shooting ranges
  • Video processing X-Y arrow hit position for archery shooting ranges

TOP

Research

  • Electro-chemical research using synthetic sand, "Cab-o-sil" (silicon dioxide)
  • Beer sterilization research using magnetically induced pressure waves
  • Internal combustion engine ignition using piezoelectric triggered sparks
  • Human motion detection using electric field fluctuations
  • Very low power radio frequency identification devices (RFID)
  • Backscatter-type 2.45GHz RFID tags and readers

TOP

Optical Communications

  • Fiber optic linked sensor, temperature , current, voltage etc.
  • Fiber optic data link, 220Mb/sec using custom asymmetrical star coupler
  • Long range optical through-the-air communications, 10 mile range prototype
  • Long range atmospheric optical attenuation monitor, xenon light flash over 1 mile of air
  • Wide area information broadcasting system using modulated light sources
  • IV drip monitor communications link using infrared light pulses
  • Custom infrared communication links with high ambient light immunity
  • Optical radar system using nitrogen spark light source
  • Modulated light sources using fluorescent and xenon lamps
  • Pulsed infrared laser system for firearm training
  • High sensitivity modulated light receiver circuits, transimpedance with LC feedback
  • 10base-T Optical Ethernet with 100 meter through-the-air-range
  • Light pulse triggered RFID tags

TOP

Consumer Products

  • Portable gas engine powered 100 pound, 200 amp arc welder
  • Capacitance proximity switches, using capacitor sensor places
  • Top leading electronic balances, some with printers and battery packs
  • High output piezoelectric beeper, 110db at 12v
  • Battery powered LED flashers, 3v and 1.5v
  • Large sun tracking concentrator type photovoltaic power systems
  • Tough activated capacitance proximity switches, both AC and DC
  • Solid state relays, very low control current (50ua)
  • Car jacking alarm system, 100s sold in New York City
  • Video interactive archery and firearm shooting range systems (patent pending)
  • Power line monitor, capacitance coupled, master/slave power switches

TOP


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HOME Page     Credentials      Design Expertise       Services Offered       Sample R&D       Sample Projects  
Products & Photos
    Past Client List       Dave's Family      Faraday Switches      Contact Us   
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