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Tester or
Instrumentation Circuits, Page 2b
Testers:
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Last Updated on:
Wednesday, November 29, 2017 05:38 AM |
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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.
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- 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.
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- 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.
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- 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.
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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.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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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] |
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AD9850 DDS daughterboard - (schematic / circuit added 05/07)
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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] |
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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] |
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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.] |
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ADE7755 Reference Board Design - ADE7755 Analog Devices Application
Notes....[App Note] In Gerber Format |
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ADE7758 Phase Dropout Detection for VAR Calculation - AN-750 Analog Devices
Application Notes....[App Note] |
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Adjustable continuity tester - Schematic only, no circuit description
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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] |
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Advanced VHF Power Meter - (circuit / schematic design added 10/06)
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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)
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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] |
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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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