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Digital and Analog Design
- Senior Engineer / Owner
2010 - maintenant
Redesign of equipment initially designed in the 1990's.
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Digital Ally, Inc.
- Senior Engineer
2007 - 2010
High-quality 900MHz Digital Radio System – up to 1W transmission power, Speex-compressed digital audio and GPS data.
Multi-camera video acquisition system - with GPS and radio store to CompacrFlash Cards.
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EDC, Inc.
- Senior Engineer / Owner
1990 - 2007
High Resolution CompactFlash Data Acquisition Systems - up to 1MSPS at 16 bits, for stand-alone recording to CompactFlash Cards.
High Resolution USB Data Acquisition Systems - up to 185kSPS at 16 bits.
Vibratory Parts Feeder Controller - I designed hardware, PCB’s, software, & firmware.
High Quality Audio Equipment - designed for NAD, ADCOM, & DB Systems
Telephony Projects - E-1/E-2 and T1/T2 Mux/Demux. Combine E-1 or T-1 with Ethernet and transmit across microwave link, then separate E-1 or T-1 from Ethernet data.
Automotive Disk Brake Diagnostic Instrument consisting of Handheld Unit including SmartMedia Interface operating in less than 8kB of RAM, 128x64 graphic LCD, 128 pixel wide Graphics printer, keypad, IRDA-compatible interface. Operating on a 68HC11 CPU. Remote Unit interfacing with 2 electronic micrometers, a 2x16 char LCD display, and an IRDA-compatible interface. I designed all hardware and software and did all of
the programming in C. The operating system is proprietary.
Industrial Pinhole Detector - I designed all hardware, PCB’s, software, and firmware. Programmed in C using a 68HC11 CPU. Unit consisted of Controller Assembly including Power Supply, 2 – 3-phase AC Motor Drivers, Lamp Power Supply for 4 – 40W Fluorescent IR Lamps, a Programmable Power Supply for up to 24 PMT’s, all of which is operated through a 16K gate FPGA. There is a Remote Operator Interface with a 4x20 char LCD display, a 4 position keypad, and various fault displays operating up to 300ft. from the Controller Interface. There are also PCB Assemblies for Dual or Quad PMT’s with up to 6 assemblies possible covering up to 96” of detector area. The operating system is proprietary.
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HDS, Inc.
- Senior Staff Scientist
1985 - 1990
Work with customers to determine their real needs and how best to fill them. Prepare estimates, system architectures, preliminary designs for proposals. Manage a small group of engineering support personnel.
Designed and patented an algorithm and hardware for a real-time surveillance-quality digital video scrambler.
Designed an interface for recording digital data on a standard VCR at 1.4Mbits/sec for applications tolerant of some errors. Designed a low-distortion, wide dynamic range Dual-Loop AGC circuit and a high quality PLL-synthesized subcarrier modulator for audio.
Defined a system for remote data acquisition of 16-bit analog and digital data through up to 21Km of fiber-optic cable. Designed most of the modules to implement the system.
Developed a precision battery-powered ultrasound thickness gauge; micropower audio log amplifiers and modulators; and miscellaneous microprocessor-based and programmable logic array-based
signal processing and transmission systems.
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Mountain State Electronics
- Senior Engineer / Owner
1978 - 1985
Precision Balance I designed all the analog interface, some of the digital interface and wrote the software.
Medical Ultrasound Scanner System - digital and analog circuit design and programming for the prototype.
Programmable X-Ray Controller - High precision control of X-Ray voltage and current with high-speed servo, controllable at local user interface or from ETHERNET.
Low-Noise, Programmable Gain and Bandwidth Data Acquisition System to be driven from a PMT.
DC Servo Systems for Digital Tape Recorders with low short-term jitter and excellent long-term speed accuracy.
Linear-Phase High-Accuracy, Low-Noise Read Amplifiers for Digital Data Recovery.
MFM Encoder / Decoders with no adjustments and extremely low error rates.
A/D and D/A Interfaces for various systems with up to 31 bits resolution; high-precision analog MUX, ultra-low power, high-accuracy remote data acquisition systems.
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Burr-Brown Corp.
- Staff Engineer
1977 - 1978
Designed the SDM858, a version of the SDM853 Data Acquisition System optimized for low source impedances.
Set up a system of ISPICE files for various discrete small-signal, driver and output transistors and wrote the
documentation of the techniques involved. Designed two IC's to form the basis of a family of hybrid power
amplifiers.
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DB Systems
- Cheif Engineer / Partner
1975 - 1977
Designed most of the circuitry and responsible for the production design of the DB-1 Precision Preamp, DB-2
Power Supply, DB-3 Active Crossover, DB-4 Moving Coil Cartridge Pre-Preamp, DB-5 Tone Control, and DB-6
Precision Power Amplifier. All circuitry was state-of-the-art in distortion and noise performance.
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Center for Naval Analyses
- Systems Programmer (Enlisted)
1971 - 1975
Wrote systems and support programs for permanent file operations and assisted in installing APL on a CDC 3800
computer. Wrote additional user routines in FORTRAN, APL, and CDC 3800 assembly language. Provided user
assistance and worked on finding and correcting system bugs.
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Logitron, Inc. (Bendix Interactive Terminals)
- Chief Engineer
1969 - 1971
Designed a switching-mode power supply capable of operating on line power anywhere in the world without range switching; a low-cost, high-performance digital acoustic coupler; and a CRT deflection system.
Designed test setups to align, calibrate, and prepare CRT terminals and sub-systems for shipment.
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Logitron, Inc. (Bendix Interactive Terminals)
- Chief Engineer
1969 - 1971
Designed a switching-mode power supply capable of operating on line power anywhere in the world without
range switching; a low-cost, high-performance digital acoustic coupler; and a CRT deflection system.
Designed test setups to align, calibrate, and prepare CRT terminals and sub-systems for shipment.
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MIT Instrumentation Laboratory
- Staff Engineeer
1968 - 1969
Designed nuclear radiation-hard power circuitry and linear and digital control circuitry. Designed a permanent magnet motor driver.
