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Sample of Products
developed by Dave Johnson & Associates |
Testers and Instruments
Control Systems
Medical Products
Alarm Systems
RF Systems
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Sensors
Video Systems
Research
Optical Communications
Consumer Products
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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