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Tester or
Instrumentation Circuits, Page 2a
Testers:
#'s A-B
C D
E F-G
H-K L
M-O P Q-R S T
U V-Z
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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AC Current Monitor - The hobby circuit below shows how a small
current transformer from Magnetek can be used to monitor AC current to a
load. The AC voltage developed at the secondary of the transformer can
be scaled so it can be read by any digital multimeter. The transformer
is rated at 30 amps.
. [Hobby Corner Circuit by Dave Johnson] |
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AC Line Current Detector - This circuit will detect AC line
currents of about 250 mA or more without making any electrical connections
to the line. Current is detected by passing one of the AC lines through an
inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800
turns of #30, #35 magnet wire.... [Bill Bowden] |
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AC power monitor uses remote sensing - 04/26/01 EDN-Design
Ideas....The detection circuit in the Design Idea "Circuit monitors ac-power
loss" (EDN, Nov 24, 1999, pg 172) requires a physical connection with the
mains to sense the power loss. The circuit in Figure 1 senses the power loss
through the radiated power-line signal.... [Design Idea by Sanjay R
Chendvankar, Tata Institute of Fundamental Research, Colaba, Mumbai, India] |
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AC Voltmeters & ammeters - Electronic Circuit design (added 02/05)
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Acceleration meter for cars - This circuit it is count the acceleration from
-1000mg up to +1000mg. Can be used in lot of applications like cars, elevators, ramps
and more.
.(electronic schematic added 03/09) |
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Acceleration Monitor using ADXL202 & AVR - (circuit / schematic design added
6/06) |
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Accelerometer Output gives Temperature Info 11/19/98 EDN-Design Ideas....The
ADXL202 dual-axis micromachined accelerometer from Analog Devices (Norwood, MA]
is appropriate for high-resolution applications. In these applications, you sometimes
need to know the ambient temperature for control purposes or for circuit-drift
compensation....scroll to find this circuit.... [Design Idea by Harvey Weinberg,
Analog Devices Inc, Cambridge, MA] |
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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.
. [Designed by David A. Johnson] |
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Accurate Digital LC Meter - Based on PIC16F84A microcontroller, 16x1 LCD and
LM311 IC (circuit added 8/06) |
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Accurate Digital LC Meter - Most accurate and simplest LC inductance /
capacitance Meter that you will find. It allows you to measure incredibly small
inductances starting from 10nH to 1000nH, 1uH to 1000uH, 1mH to 100mH and capacitance
from 0.1pF up to 900nF.
.(design added 11/08) |
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Accurately measure resistance with less than perfect components - 11-Nov-04
Issue of EDN 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 by Dave Van Ess, Cypress Semiconductor] |
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