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Tester or Instrumentation Circuits, Page 2b
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Last Updated on: Friday, March 12, 2010 12:07 PM


Circuits Designed by Dave Johnson, P.E. :
  • ACCEPTABLE VOLTAGE INDICTOR
    I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed.  The circuit can also be used to adjust a particular voltage be within specific high or low limits.  The three LEDs will indicate if the voltage is high, low or OK.  When connected to other converters, such as a frequency to voltage converter, a current to voltage converter or a power to voltage meter, it could provide a quick indication of a proper level.
  • BROAD BAND 2MHz OPTICAL FIBER RECEIVER
    If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector.
  • BROAD BAND 5MHz OPTICAL FIBER RECEIVER
    This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz. It is great for experimenting with various modulated light sources.
  • BROAD BAND 50MHz OPTICAL FIBER RECEIVER VERSION A
    If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard BNC plug. When the box is plugged into to the input of an oscilloscope with a 50-ohm termination resistor, it can detect light pulse frequencies beyond 100MHz.
  • Brownout Voltage Tester
    I used this circuit years ago to test AC line powered devices under 95vac line voltage conditions.  It has a rating of 250 watts.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
AN-256: Circuitry for Inexpensive Relative Humidity Measurement - National Semiconductor Application Note  (app note added 2/06)
AN-265: An Electronic Watt-Watt-Hour Meter - National Semiconductor Application Note  (app note added 2/06)
AN290 Practical Temperature Measurement - Aligent App Note  (app note added 6/07)
AN-297: Test Video A/D Converters Under Dynamic Conditions  - AN-297-Analog Device Application Notes  (app note added 6/06) 
AN-300: Simple Circuit Detects Loss of 4-20 mA Signal - National Semiconductor Application Note  (app note added 2/06)
AN-347: Shielding and Guarding - AN-347 Analog Devices Application Notes  (app note added 6/06)  How to Exclude Interference-Type Noise. What to do and Why to do it-A Rational Approach
AN-349: Keys to Longer Life for CMOS - AN-349 Analog Devices Application Notes  (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
AN36 ZXBM200x Series of Variable Speed 2-Phase Fan Motor Controller
Zetec Semiconductors  Applications Notes  A guide for using  ZXCT range of products. Contained within  note are application ideas for extended supply ranges, a circuit for bi-directional current sensing and an over-current/short circuit protection circuit. Now updated and contained within AN39  (app note added 2/06)
AN39 Current Measurement Applications Handbook - Zetec Semiconductors  Applications Notes This applications handbook explores how  requirements affect  design for AC and DC current measurement and  implications on cost and performance for different approaches.   (app note added 2/06)
AN-4109 / A Guide to the Design of Current Feedback Control - Fairchild Application Notes / (app note added 6/06)
AN557: Four Channel Digital Voltmeter with Display and Keyboard - Microchip Application Note Published 27-May-05  (app note added 2/06)
AN-559: A Low Cost Watt-Hour Energy Meter Based on the AD7755 Chinese Version -5/2000 - AN-559 Analog Devices Application Notes  (app note added 6/06)
AN-559: A Low Cost Watt-Hour Energy Meter Based on the ADE7755 - AN-559 Analog Devices Application Notes  (app note added 6/06)
AN-563: A Tamper-Resistant Watt-Hour Energy Meter - AN-563 Analog Devices Application Notes  (app note added 6/06)  Based on  ADE7751 and Two Current Sensors
AN570: Calibrating the MTA11200 System - Microchip Application Note Published 26-Aug-97  (app note added 2/06)
AN-574: A Tamper-Resistant Watt-Hour Energy Meter Based on the AD7751 - AN-574 Analog Devices Application Notes  (app note added 6/06)  With a Current Transformer and a Low Resistant Shunt
AN-578: RMS Calculations for Energy Meter Applications Using the ADE7756 - AN-578 Analog Devices Application Notes  (app note added 6/06)  The document describes  implementation of an rms signal processing algorithm using  ADE7756 and a Microcontroller (PIC16C63)  from Microchip.
AN-60-013  Gali Test Fixture Instructions - Application Note MiniCircuits.com  (app note added 2/06)
AN-60-015  Gali-TBF Test Fixture Instructions - Application Note MiniCircuits.com  (app note added 2/06)
AN-60-018  MAR/RAM Test Fixture Instructions - Application Note MiniCircuits.com  (app note added 2/06)
AN-60-019  ERA-SM Test Board: Instructions for Use - Application Note MiniCircuits.com  (app note added 2/06)
AN-6002 / Component calculations and simulation tools for FAN5234 or FAN5236 - Fairchild Application Notes / (app note added 6/06)

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