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Tester or
Instrumentation Circuits, Page 2c Testers:
#'sA-BCDEF-GH-KLM-OPQ-RSTUV-Z Last Updated on:
Monday, October 03, 2011 06:08 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 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]
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-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
