Testers or Instruments electronic circuits, beginning with A-B's

Tester or Instrumentation Circuits, Page 2c
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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:

An Ammeter Made From A Voltmeter - The Circuit is for a 'Shunt' type ammeter that allows a meter movement with a small current rating to be used to measure a much larger current. In this example 1 milliamp through the meter coil will represent 1.5 amps by shunting most of the current through the 0.1 Ohm resistor. [from Rob Paisley's Model Train web site]

An Electronic Watt-Watt-Hour Meter - National Semiconductor Application Note (app note added 2/06)

AN007 Measurement & Evaluation of Pulse Shapes in T1/E1 Transmission Systems - (app note added 6/07)

AN1013: Gas & Water Metering with the PIC16F91X Family - Microchip Application Note Published 20-Jan-06....[App Note]

AN-1040: LVDS Performance: Bit Error Rate BER Testing Test Report #2 - National Semiconductor Application Note (app note added 2/06)

AN-1200: Mixed Signal Testing using the IEEE 1149.4 STA400 - National Semiconductor Application Note (app note added 2/06)

AN-1287: DP83815 MacPHYTER & DP83816 MacPHYTER-II High Data Rate Stress Testing - National Semiconductor Application Note (app note added 2/06)

AN19 Component Reliability - Zetec Semiconductors Applications NotesThis note introduces basic reliability ory, failure rate analysis, and product qualification methods, and includes sample data and FITs values for a variety of test methods. (app note added 2/06)

AN-215A: Designer's Guide to Flash- ADC Testing, Part 1 - AN-215A Analog Devices Application Notes....[App Note] Flash ADCs Provide Basis for High Speed Conversion.

AN-215B: Designer's Guide to Flash- ADC Testing, Part 2 - AN-215B Analog Devices Application Notes....[App Note] DSP Test Techniques Keep Flash ADCs In Check

AN-215C: Designer's Guide to Flash- ADC Testing, Part 3 - AN-215C Analog Devices Application Notes....[App Note] Measure Flash- ADC Performance for Trouble-Free Operation

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]

AN-300: Simple Circuit Detects Loss of 4-20 mA Signal - National Semiconductor Application Note (app note added 2/06)

AN-347: Shielding & Guarding - AN-347 Analog Devices Application Notes....[App Note] 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

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