|
Tester or
Instrumentation Circuits, Page 2f
Testers:
#'s A-B
C D
E F-G
H-K L
M-O P Q-R S T V-Z
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:
|
|
Analog inputs for ATtiny26 - Study the Analog to Digital
capabilities of Atmel ATtiny26. This check circuit uses only 3 inputs.
Of course you can may changes to use more inputs.….(Circuit design added
03/09) |
| Analog LED Bar VU Meter - The
circuit was designed to work with an audio power amplifier which operated
off +18v-0v-18v power rails. The actual voltage used is not too critical
except that the feedback is referred to the LED chain which itself is
anchored to a +12v rail, hence the separate stabilizer....(added 5/09)
|
|
|
|
Analog Milliamp Meter Used as Voltmeter - A milliamp meter can be
used as a volt meter by adding a series resistance. The resistance needed is
the full scale voltage reading divided by the full scale current of the
meter movement. So, if you have a 1 milliamp meter and you want to read 0-10
volts you will need a total resistance of 10/.001 = 10K ohms.... [Bill
Bowdewn's site] |
|
Analog-input circuit serves any microcontroller - 20-Dec-01 Issue
of EDN The simple ADC in Figure 1 is perfect for getting analog
signals into a purely digital microcontroller. Using just five surface-mount
parts, you... [Design Idea by Steven Hageman, Agilent Technologies, Santa
Rosa, CA] |
|
|
|
Analyze LED characteristics with Pspice 01/18/01 EDN-Design Ideas....Recent
advances in LED technology have lead to LEDs’ widespread use in outdoor-signal
applications, such as in traffic and railroad signals….PDF has several circuits,
scroll down…. [Design Idea by Sam Mollet, GE Harris Harmon Railway Technology, Grain
Valley, MO] |
|
Analyzer tests reverse recovery behavior of diodes - 19-Jul-07 Issue of EDN
Testing the reverse-recovery time of diodes yourself proves advantageous because you
cannot easily compare data sheets from different manufacturers.... [Design Idea by
Louis Vlemincq, Belgacom, Evere, Belgium] |
|
AN-H42: HV430: 105 Volt RMS Ring Generator - Supertex Semiconductors
(app note added 2/06) |
|
ATE-Low Cost IC Tester - Intersil Application Block Diagram....[App Note]
|
|
Audible continuity tester - Schematic only, no circuit description
|
|
Audible continuity Tester - A logic tester with an audible indicator can be
handy when troubleshooting or testing a crowded circuit board. It allows you to keep
your eyes on the circuit, rather than on a LED on the tester. The project described in
this article is just such a tester. It provides an audible indication of the logic
level of the signal presented to its input.... [Tony van Roon's circuit] |
|
Audible Logic Probe - When testing circuits with a logic probe, it is
sometimes difficult to watch the LEDS on the probe to determine the logic state. With
this probe the logic states are audible. This probe is designed for TTL circuits
only but could be modified for CMOS. The way.... [Randy Linscott] |
|
Audio Frequency Meter - The circuit was designed to work with an audio power
amplifier which operated off +18v-0v-18v power rails. The actual voltage used is not
too critical except that the feedback is referred to the LED chain which itself is
anchored to a +12v rail, hence the separate stabilizer....(added 5/09) |
|
Audio level meter VU Meter - This circuit uses just one IC and a very few
number of external components. It displays audio level in terms of 10 LEDs. The
input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a
monolithic integrated circuit that senses analog voltage levels and drives ten LEDs
providing a logarithmic 3 dB/step analog display. LED current drive....(added 6/06)
|
|
Audio MilliVoltmeter - For Testing Amplifiers (etc), An analogue design, 3mV
to 30V with dB scale (electronic schematic / circuit added 4/02) |
|
Audio notch filter audio frequencies 100Hz-10kHz - A variable notch filter
with both high and low pass filters. For audio frequencies 100Hz 10KHz ....
|
|
Audio Peak Reading Meters - (circuit / schematic design added 6/06)
|
|
Audio Spectrum Monitor - A digital audio signal processing experiment of
real-time FFT (Fast Fourier Transform) analysis. (added 10/05) |
|
Audio Test Oscillator - As a piece of test equipment, an audio oscillator
has to be considered essential for anyone working in with hi-fi gear. Toger with an
audio millivoltmeter (as described in Project 16), and even better if you have access
to an oscilloscope, you will be able to make proper measurements on everything from
preamps, RIAA equalization stages (for vinyl disks), tone controls,....(added 4/02)
|
|
Audio-test accessory isolates and matches loads - 16-Mar-06 Issue of EDN
This low-cost, switchable, dual-impedance transformation circuit comprises a single
conventional transformer and two minimum-loss pads.... [Design Idea by Richard M
Kurzrok, RMK Consultants, Queens Village, NY; Edited by Brad Thompson and Fran
Granville] |
|
AVR Digital Voltmeter - Most electronics hobbyists these days find a digital
voltmeter indispensable. Indeed, having more than one is a positive advantage!This
little project with six voltmeters in one inexpensive box therefore has some very
useful features for the hobbyist. The unit is quite inexpensive, two ICs and a couple
of transistors. One of the ICs is an AT90S4433 AVR..(electronic circuit added 4/05)
|
|
|
|
|
Testers
Previous A-B's Next |
Testers: #'s
A-B C
D E
F-G H-K
L M-O P
Q-R S T V-Z
|
|
|
