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Tester or Instrumentation Circuits, Page 2b
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Last Updated on: Wednesday, November 29, 2017 05:38 AM

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:
Active-filter circuit and oscilloscope inspect a Class D amplifier's output -  1-Dec-06 Issue of EDN  Ease debugging of bridge-output pulse-width-modulated audio amplifiers with this circuit.... [Design Idea by John Guy, Maxim Integrated Products Inc, Sunnyvale, CA; Edited by Brad Thompson and Fran Granville]
AD9850 DDS daughterboard -  (schematic / circuit added 05/07)

ADC enables temperature compensated weigh scale measurements -  5-Jul-01 Issue of EDN  You can provide temperature compensation in weigh-scale applications by simultaneously measuring both the temperature of the bridge and the primary output of the bridge transducer. Traditionally, an integrated multiplexer connects multiple input variables to a single sigma-delta ADC..... [Design Idea by Albert O'Grady, Analog Devices, Limerick, Ireland]
ADC's Reference Improves Rtd Measurements -  10/27/94 EDN-Design Ideas....Temperature measurements using RTDs (resistance-temperature detectors]generally employ bridge circuits with stable power supplies for signal conditioning. Unfortunately, this scheme generally produces nonlinear outputs. A linear bridge configuration.... [Design Idea by Bharat Heavy Electricals Ltd, Tiruchirapalli, India]
Add-On Current Limiter -  This circuit allows you to set a limit on the maximum output current available from your PSU. It's very useful when you power-up a project for the first time - or carry out a soak-test. By setting an upper limit on the current available from your PSU - you can protect both your power supply - and any device connected to it....(added 12/2009) [Circuit designed by Ron J.]
ADE7755 Reference Board Design -  ADE7755 Analog Devices Application Notes....[App Note]  In Gerber Format
ADE7758 Phase Dropout Detection for VAR Calculation -  AN-750 Analog Devices Application Notes....[App Note]
Adjustable continuity tester -  Schematic only, no circuit description
Adjustment Free Inclinometer operates on 27V -  4/24/97 EDN-Design Ideas....The circuit in Figure 1 is an inclinometer (tilt-measuring circuit] in which the sensor is filled with liquid electrolyte. Acting like a potentiometer, this sensor produces a voltage proportional to the tilt on the center electrode. Because the liquid is subject to electrolysis, the sensor must have an ac-forcing voltage with an average dc component of zero.... [Design Idea by John Wettroth, Maxim Integrated Products, Sunnyvale, CA]
Advanced VHF Power Meter -  (circuit / schematic design added 10/06)
Alarm Power Supply With Battery Back-up -  This Power Supply is suitable for the Modular Burglar Alarm. However, it has other applications. It is designed to provide an output of 12-volts, with a current of up to 1-amp. In the event of mains failure, the back-up battery takes over automatically....(Circuit design added 6/07)
Altimeter/Variometer for free flying -  A handheld instrument intended for the paraglider and hang glider pilot. Displays altitude above sea level, altitude above take off, climb and fall rates, flight time, maximum altitude. Software-calibrated, features a backlit LCD, internal rechargeable batteries and internal charge regulator. Uses a Basic Stamp II. [Manfred Mornhinweg]
AN 1404: The Truth About the Fidelity of High Bandwidth Voltage Probes 5988-6515EN -  Aligent App Note  (app note added 6/07)
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