Schematic Diagrams

Schematic Diagrams, Plans and Construction Articles

Unfortunately, because of copyright or IP restrictions, I can’t upload all the schematics that I would like to make available on the Web. However, I’ll post non-conflicting schematics on this page. Check it often! I build a lot of stuff! If you use or reproduce any of these, please give credit to the author!

The book Design and Development of Medical Electronic Instrumentation contains many of my favorite building blocks for amplifying, processing, simulating, and evoking biopotentials. The book provides complete circuit schematic diagrams, part lists, suppliers and construction tips for tested, real-world projects that range from simple biopotential amplifiers all the way to a computer-controlled defibrillator. Wiley has an FTP site for the book that contains source code and compiled software needed to successfully complete the projects.

Medical Electronics

Ultra-Wideband (UWB)

Other Interesting Medical Electronics Schematics:

· Bootstrapped AC-Coupled Differential Amplifier for Biopotentials

· Non-contact biopotential electrodes (pick up ECG, EEG, etc. with no contact with patient!) - the paper that you really want to get hold of is R J Prance et al. (2000) Meas. Sci. Technol. 11 291-297, “An ultra-low-noise electrical-potential probe for human-body scanning”. It includes schematics and PCB layout for a non-contact circuit based on an INA116 instrumentation amplifier.

· Construction of a sensor array for measuring contact stresses between flexible bodies (orthopedics, robotic tactile sensing, prevention of decubitus ulcers, etc.). [Paper #2]

· Schematics for a system to measure the 3-D location of human anatomical landmarks (measurement of human body kinematics) based on infrared LEDs for which their 3-D position is determined via two 2-D position-sensitive “cameras” in “Remote Measurement of Human-Body/Exoskeleton Kinematics”

Resources:

The Transactions of the IEEE Engineering in Medicine and Biology Society (EMBS) is full of technical articles on current technologies and methods used in biomedical and clinical engineering. Membership in the IEEE can give you access to the huge collection of technical papers through the IEEE Member Digital Library (read, print and save up to 25 full-text articles each month for just $35 a month).

· Simple ultra-wideband transmitter

· Simple ultra-wideband baseband receiver uses tunnel diode

· Tunnel diode pulser 20ps risetime

· Ultrawideband transceiver pair

· McEwan’s Micropower Impulse Radar

· McEwan’s fast pulser

· Simple step-recovery-diode (SRD) pulse generator

· Low-Cost Ultra-Wideband, Ultra-Short-Pulse Transmitter with MESFET Impulse-Shaping Circuitry is described in:

· Jeong Soo Lee and Cam Nguyen, Novel Low-Cost Ultra-Wideband, Ultra-Short-Pulse Transmitter with MESFET Impulse-Shaping Circuitry for Reduced Distortion and Improved Pulse Repetition Rate, IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 11, NO. 5, MAY 2001. [PDF]

· Jeongwoo Han and Cam Nguyen, A New Ultra-Wideband, Ultra-Short Monocycle Pulse Generator With Reduced Ringing, IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 12, NO. 6, JUNE 2002 [PDF]

High Voltage

· Book recommendations:

· “Electronic Gadgets for the Evil Genius” by Robert Iannini

· “Build your own working fiberoptic, infrared, and laser space-age projects” by Robert Iannini

Hobby Circuits

· A PIC-based project that turns a multicolor (rainbow) LED into a color-indicating Rainbow LED Voltmeter [Complete with Software]

· I can’t post the schematics for the following because of Copyright, but you can purchase back-issues in print and on CD ROM from Circuit Cellar Ink:

· Battery-operated power supplies, NiCd/NiMH/lead-acid battery chargers in D. Prutchi, “Design of Battery-Operated Power Supplies", Circuit Cellar Ink, Issue #55, 36-48, February 1995.

· Hot-swap extender useful for developing test setups, PC add-in card prototyping and for PC troubleshooting in: D. Prutchi, "HotSwapping on the PC: An Active Extender Card for the PC ISA Bus", Circuit Cellar Ink, Issue #62, 62-71, September 1995.

· Complete schematics and software for a parallel-computer add-in card for the PC in D. Prutchi, "Parallel Processing with Transputers", Circuit Cellar Ink, Issue #64, 20-35, November 1995.

· A simple A/D converter powered from the PC printer port, useful as simple way to add digital-interfacing to analog-only instruments in D. Prutchi, "LPT:Analog!, A 12-bit A/D Converter Printer Port Adapter", Circuit Cellar Ink, Issue #67, 26-33, February 1996.

· Complete schematics for a spectrum analyzer adaptor for oscilloscopes, including the construction of near-field probes to sniff for interference in D. Prutchi, "Sniffing EMI in the Near-Field", Circuit Cellar Ink, Issue #71, 30-41, June 1996. [Circuit schematic diagrams and expanded information available in the book: Design and Development of Medical Electronic Instrumentation]

· Direct digital synthesis (DDS) and programmable arbitrary (arb) generator schematics in D. Prutchi, "Digital Generation of High-Frequency Waveforms", Circuit Cellar Ink, Issue #84, 12-21, July 1997. [Circuit schematic diagrams and expanded information available in the book: Design and Development of Medical Electronic Instrumentation]

· Schematics for allowing the PC sound card to be used as a DC-correct programmable signal generator in D. Prutchi and M. Norris, “Converting the PC Sound Card into a Precision DC-Coupled Arbitrary Waveform Generator”, Circuit Cellar Ink, Issue #147, 52-56, October 2002. [Circuit schematic diagrams and expanded information available in the book: Design and Development of Medical Electronic Instrumentation]

· Schematics for a circuit that turns the PC sound card into a DC-correct data acquisition system in: D. Prutchi and M. Norris, “VCO Transforms PC Sound Card into Precision DC-Coupled A/D”, Ideas for Design, Electronic Design”, 59-60, August 19, 2002.

· Schematics and software for the LPT:Analog! V2.0—a simple 12-bit A/D converter powered by the PC printer Port. [Software]

Lasers

· The Laser Billboard - A Low-Cost Laser Image Projection System [Software]

· Book recommendations:

· “Electronic Gadgets for the Evil Genius” by Robert Iannini

· “Build your own working fiberoptic, infrared, and laser space-age projects” by Robert Iannini

· Microwave (gunnplexer) amateur weather radar (page 1, page 2, page 3)

· D. Prutchi, “Passive-Detector Receiver Keeps You Informed, Entertained During Flights”, Design Idea, EDN, 98-99, May 12, 2005. [PDF] (FAA regulations generally forbid the use of receivers onboard commercial aircraft because a superheterodyne receiver’s local oscillator can radiate signals that could interfere with aircraft communication and navigation systems. The crystal radio of this project directly detects nearby AM signals in the very-high frequency aircraft band, 118 to 137 MHz, and thus cannot interfere with aircraft equipment. Communications between the pilot and the flight controllers are brief and infrequent, and listening to the airplane band as a passenger can get boring. However, the circuit in this project improves on an earlier passive aircraft-band receiver by allowing you to enjoy an aircraft’s in-flight-entertainment system while monitoring pilot-to-ground communications…). EDN’s schematic contains a few mistakes. Here is the corrected schematic: [ERRATA pdf]

Radiation

· Redrawn Schematic diagram of the Electro Neutronics CD V-700 model 6b Geiger survey meter

· George Dowell’s LENi mod for the ENi CD V-700 model 6b

· David Prutchi’s CDV700 Pro Geiger counter

· David Prutchi’s digital counter/scaler adapter for the CD V-700

· Charlie Thompson’s 0 to 1500V+, regulated, low-ripple HV power supply for PMT's and Geiger tubes

· The Berkeley Lab Cosmic Ray Detector

Scientific Instruments, Physics, Amateur Science

The following amateur science resources seem to be well-kept secrets:

· My favorite source of amateur science projects was always the “Amateur Scientist”, which used to be published by Scientific American. Unfortunately, Scientific American dropped this column after 27 years of existence. I did not renew my subscription to Scientific American after this happened. Fortunately, a complete collection of all Amateur Scientist columns is available on CD ROM. This is a must-have resource for anyone interested in experimental Science. It has great projects including NMR, generating x-rays, particle accelerators, electrostatics, biology, seismometry, etc.

· The best-kept secret is that there still is a great source for high-level Science projects. The “American Journal of Physics” (AJP), which is published monthly by the American Association of Physics Teachers carries excellent tutorial articles on otherwise difficult-to-understand topics, construction articles and original research papers. The membership to AAPT to receive the printed and electronic versions of AJP is not cheap (~$140 per year), but will give you access to every paper published in the AJP since 1975!! You can search for articles for free at scitation.aip.org/ajp/. AJP carries GREAT articles for the serious amateur scientist: low-cost/modernized replications of famous experiments (Frank-Hertz, speed of light, etc.), low-cost demonstration methods of brand-new techniques (e.g. laser tweezers, laser cooling of Rubidium gas, laser cold trap, etc.), low-cost scientific instruments (phase-sensitive amplifier, experiments in quantum optics, nuclear magnetic resonance spectroscope, etc.), advanced science projects (superconductors, lasers, holograms, chaos synchronization, Casimir force, EPR experiments, single-particle interference, etc.)

· IEEE Xplore provides full-text access to IEEE transactions, journals, magazines and conference proceedings published since 1988 plus select content back to 1950, and all current IEEE Standards. You can purchase individual papers online. In addition, membership in the IEEE can give you access to the huge collection of technical papers through the IEEE Member Digital Library (read, print and save up to 25 full-text articles each month for just $35 a month).

· Another great resource is the journal “Review of Scientific Instruments” published by the American Institute of Physics. You can search articles by topic through their Physics Finder website. You may be interested in the topics under the category “Electronics; radiowave and microwave technology; direct energy conversion and storage”. You can purchase individual articles using your credit card.

· If your mind is a bit deeper than that of the target population for Popular Science and Popular Mechanics, yet want to get a fast report on the main science news, then try “New Scientist”. This weekly magazine from the UK carries in-depth reports on the most important topics in science. They also carry fun columns such as “The Last Word” with reader questions and answers on the science behind puzzling everyday phenomena; Feedback, strange but true tales from the world of science and Soundbites, who said what in the last week.

· CommLinx Solutions (Australia) has free schematics for all sorts of interesting RF and GPS devices on their website.

· Silicon Chip Magazine (Australia) has many interesting hobby construction articles in their website (see "Projects to Build" section).

· Elektor Electronics Magazine is the prime European publication for all professionals and hobbyists actively engaged in electronics and computer technology. It is full of construction articles with high-quality data and layouts. It is definitely a wonderful source for high-level electronics projects and interesting articles. Elektor sells all of its back issues since 1996 in CD ROM format. In addition, their CD ROMs of competition submissions are full of great projects that are too large to publish in magazine format. Worth every cent!

The following hobby resources seem to be well-kept secrets (at least in the US):

· CommLinx Solutions (Australia) has free schematics for all sorts of interesting RF and GPS devices on their website.

· Hamtronics has full manuals including schematics for their products (HF/VHF/UHF amplifiers, receivers, transmitters) on their website.

The following RF resources seem to be well-kept secrets :