Credentials & Capabilities of  Dave Johnson, P.E.
Last Updated on:  Friday, April 11, 2008 06:25:32 AM

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• Colorado Registered Professional Engineer, #174-25, 1980
• Holds eight patents with one more patents pending. 
• University of Idaho, Bachelor of Science Degree, EE

• Chief designer of a new RFID card reader that cost about one half the reader it replaced.  Developed a very low power radio frequency identification (RFID) card reading system.  The system was used as a replacement to hotel room door lock keys.  Received US patent #6,476,708.
   

• Helped develop a wireless method to monitor the air pressure and temperature inside an automobile tire.  The system used a custom radio frequency identification (RFID) circuit.  A special antenna allowed an external magnetic excitation field to power the RFID circuit and retrieve the tire data.  Received US patent #7,019,711 and one Brazilian patent.
   

• Helped develop a complete video interactive archery/firearm shooting range system.  System projected moving targets onto a fabric screen using a computer, laser disk player and video projector. Reflector tipped arrows and an infrared CCD camera determined where the arrows hit the target. Also developed a similar shooting range system that used infrared laser equipped pistols, rifles and shotguns. Systems launched laser light pulses at screen targets instead of arrows. 500+ installations now installed and operating. Wrote detailed descriptions for a patent application on the techniques used. Received US patent #5,566,951.
   

• Conducted research and designed circuits to detect, count and size air bubbles in blood using ultrasound techniques. Bubbles with volumes less than 1 nanoliter were detectable. Circuit used in a kidney dialysis machine. Designed and built a portable battery powered bubble monitor used by the company's sales force to show potential buyers the bubble-free nature of the disposable dialysis machine tubing sets. Wrote circuit descriptions for a patent application on the bubble detector system.  Received US patent #5,394,732, Japan patent #2823513 and European patent..
   

• Developed a product that monitored the resistance of a domestic earth ground connection.  The circuit also measured the earth ground current and the voltage with respect to the power line neutral wire.  System was used in conjunction with a transient voltage suppression system.  Received US Patent 7023680
   

• Developed a system to monitor the concentration of a soap/water mixture used in carwash soap dispensing systems.  The method used an optical technique to maintain the desired soap concentration.  Wrote a description of the electronic circuit used in the monitor.  Over 3,000 systems were installed.  One patent pending.

• Published many articles and circuits in EDN, Electronic Design, Popular Electronics and Midnight Engineering magazines. Produced an extensive 10MB Internet web site that promotes consulting engineering services. The site also has a 350+ page e-zine of useful information on general science, technology, creativity, science experiments, inventing and electro optics.

• Developed several families of touch activated AC and DC electronic switches. Switches were mostly used to control lights, doors and intercoms in jail cells. Switches had to survive severe abuse without requiring replacement. Designed and developed a complete jail door control and monitoring system for Colorado Arapahoe County jail as well as several other jails in Texas, Florida, New York and California. Sent the line of products through CSA, CKC and UL safety testing programs. Developed another line of very low power DC capacitance proximity switches. One switch operates up to 5 years on a single 1.5v button battery.

• Designed, built and successfully demonstrated an optical through the air communications link with a range of 6 miles. Also demonstrated the feasibility of using clouds as large light pulse reflectors. In addition, conducted tests on atmospheric attenuation of light pulses under various weather conditions. Proposed methods for a 40 mile telemetry link using a xenon flash light source. Proposed uses for nitrogen spark light sources. Uses included optical radar and long range distance measurements. Proposed a wide area optical information broadcasting system that would cover an entire metropolitan area with high speed data services.

• Designed and developed several new consumer products, including cordless telephones, combustible gas detectors, smoke detectors, backup alarms, anti-carjacking alarms, coin operated panorama telescopes and motion intrusion alarms. The motion alarm worked on the basis of monitoring the disturbance of the earth's natural electric field. Wrote patent papers on the intrusion alarm system.

• Solved a large number of engineering, industrial and medical instrumentation problems for a variety of companies. Designed and built many custom test stations and fixtures.   Advised many companies on ways to reduce manufacturing cost and improve quality.   Led brainstorm sessions to produce new product ideas and new applications for existing products.

• Constructed many special test stations and special instruments for explosive devices, including initiator testers for Ford and GM airbags. Designed and constructed explosive flash detector/timer monitors. Monitors measured and tested the delay between primer impact and actual explosion. Designed and constructed a laser welder process controller. Controller used an optical fiber probe to monitor and count laser light flashes during welding. Designed a computer controlled test station to test components used on the Trident missile.

• Evaluated a special color NTSC video enhancement circuit for use in consumer TVs for a large cable company. Designed and built a prototype circuit to test picture improvements. Wrote detailed report of findings. Also designed and built several custom video signal test generators that were used in medial camera applications.

David A. Johnson, P.E. is consulting electronics engineer with a broad spectrum of experience that includes product research, design and development; electronic circuit design; design, building and testing prototypes; electro-optics; and custom test instruments. Doing business for more than 30 years as David Johnson & Associates, Dave has established himself as an electronics engineer who can provide a variety of services.  His proficiency is based on "hands-on" experience in general engineering, electronics and electro-optics.  

He remains well-informed of the latest scientific and engineering advancements through independent studies. Dave is a published author with articles and designs in EDN, Electric Design, Midnight Engineering and Popular Electronics.