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Tester or
Instrumentation Circuits, Page 2a
Testers:
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Last Updated on:
Friday, October 16, 2009 03:43 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.
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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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Accurately measure resistance with less than perfect components - 11/11/04 EDN-Design
Ideas: For transducers, such as strain gauges or thermistors, you must
accurately and inexpensively measure resistance using circuitry built with
imperfect components and in which gain and offset errors can significantly limit
the accuracy of ohmic measurements. The right circuit topology makes it possible
to eliminate most error terms while measuring ohms, leaving the accuracy to be
determined by jus.....(design idea added 11/04) |
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Active filter circuit and oscilloscope inspect a Class D amplifier's output -
12/01/06 EDN-Design Ideas: Ease debugging of bridge-output
pulse-width-modulated audio amplifiers with this circuit.....(design idea added
12/09 |
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AD9850 DDS daughterboard - (schematic / circuit added 05/07) |
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ADC enables temperature compensated Weigh scale measurements - 07/05/01 EDN-Design
Ideas: You can provide temperature compensation in weigh-scale
applications by simultaneously measuring both temperature of bridge
and primary output of bridge transducer. Traditionally, an integrated
multiplexer connects multiple input variables to a single sigma-delta ADC. Each
time multiplexer switches input, ADC.....(design idea added
1/05) |
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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 that uses two identical current sources depends on accuracy of
matching sources.....(design idea added 6/06) |
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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
….(circuit design added 11/08) |
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ADE7755 Reference Board Design - ADE7755 Analog Devices Application Notes
(app note added 6/06) In Gerber Format |
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ADE7758 Phase Dropout Detection for VAR Calculation - AN-750 Analog Devices
Application Notes (app note added 6/06) |
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Adjustment Free Inclinometer operates on 27V - 04/24/97 EDN-Design Ideas:
(design idea added 3/03) |
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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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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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An Electronic Watt-Watt-Hour Meter - National Semiconductor Application Note
(app note added 2/06) |
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AN007 Measurement and Evaluation of Pulse Shapes in T1/E1 Transmission Systems
- (app note added 6/07) |
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