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Tester or
Instrumentation Circuits, Page 3c
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. : |
- CAPACITANCE
TYPE LIQUID LEVEL MONITOR
This circuit was originally designed to monitor the level of liquid natural gas in a
tank but it can be used to also measure almost any liquid. Two custom insulated
metal tubes form a capacitor plate. The capacitance between the two tubes increases
as the level of the liquid rises. The circuit converts an increase of capacitance
into a positive voltage change. The circuit could be changed to handle almost any
scale factor needed.
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- Cheap
Electrostatic Discharge Tester
Anyone who has ever had a shocking experience on an
especially dry day is acutely aware of the kinds of high voltage that can be
generated from a simple walk across a carpeted floor. Those same finger to metal
sparks can destroy or disrupt sensitive electronic circuits. Good design practices
take great care to avoid such potential disasters by maintaining sufficient
insulation between metal or plastic enclosure parts and the electronics within or by
shielding any especially sensitive components....
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- Cheap Light
Power Meter
Some time ago I was experimenting with the use of some low leakage photovoltaic
solar cells, to harvest some energy from the diffuse lighting inside a room.
The plan was to use a small array of solar cells (the type often used on solar
powered calculators) to keep a super capacitor charged, drawing power from the light
within an inside room...
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Convert your DMM to a pH meter - 17-Oct-02 Issue of EDN It's
often necessary to know the acidity of a solution to control a process. Even
inexpensive pH meters can be relatively costly, and many of the inexpensive
models have no output that you can readily connect to.... [Design Idea by
Bill Donofrio, Nu-Products, Cordova, TN] |
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Create your Own Meter - (electronic Circuit diagram added
03/03/03) |
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Creating a Reactive Energy Pulse Output Based on the ADE7753 -
AN-758 Analog Devices Application Notes....[App Note] |
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Crystal Test Circuits - Two simple test circuits to check
operation of quartz crystals. [Andy Collison] |
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Crystal Tester - This circuit enables you to test quartz
resonators at the range values from 32kHz to 24MHz. Confirmation of good
state of quartz resonator is done by diode signalling LED and acoustic
signal. Switch S2 enables change of range….(electronic schematic added
08/08) |
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Crystal Tester - ….must register on this site.... [Published in
Elecktor July/August 2010] |
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Crystal Tester, #1 - Transistor Q1, a 2N3563, and its associated components
form an oscillator circuit that will oscillate if, and only if, a good crystal is
connected to the test clips. The output from the oscillator is then rectified by
the 1N4148 signal diode and filtered by C3, a 100pF capacitor. The positive voltage
developed across the capacitor is applied to the base of Q2, another 2N3563, causing
it to conduct. When that happens, current flows through Led1, causing it to glow…..
[Tony van Roon's circuit] |
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Crystal Tester, #2 - Transistor Q1, a 2N3563, and its associated components
form an oscillator circuit that will oscillate if, and only if, a good crystal is
connected to the test clips. The output from the oscillator is then rectified by
the two 1N4148 signal diodes (1N914 are fine too) and filtered by C1, a 0.01uF ceramic
capacitor….. [Tony van Roon's circuit] |
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Crystal Tester, #3 - Your 40- or 80 meter crystal isn't oscillation--what's
wrong? Is it a wiring error? A solder bridge? A faulty component? Maybe it's the
crystal! A simple circuit that tests whether or not a crystal is good, this is a real
chestnut. First noticed in October 1989 issue of "Popular Electronics Magazine"
but the original circuit is credited to Mike Kaufman in Wayne Green's out-of-print
book…. [Tony van Roon's circuit] |
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Curious C Beeper - The Curious C-Beeper uses the two-transistor flasher in
conjunction with a darlington transistor to make a most unusual capacitance beeper
probe. When a capacitor is touched to the probe, the probe beeps at a frequency that
varies with capacitance. The frequency change....(diagram added 8/03) |
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Current Feedback Loop Gain Analysis & Performance Enhancement - National
Semiconductor Application Note (app note added 2/06) |
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Current Measurement Applications Handbook - Zetec Semiconductors
Applications NotesThis applications handbook explores how the requirements affect the
design for AC and DC current measurement and the implications on cost and performance
for different approaches. (app note added 2/06) |
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Current Sense Auto Power Switch - A current sensing switch turns on multiple
devices from one master.... |
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Current Sense Curcuit Collection - AN105 Linear Technology Sensing and/or
controlling current flow is a fundamental requirement in many electronics systems, and
the techniques to do so are as diverse as the applications themselves. This
Application Note compiles solutions to current sensing problems and organizes the
solutions by general application type. These circuits have been culled from a variety
of Linear Technology documents. |
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Current-sense Amplifier Handles High-Voltages - 11/06/97 EDN-Design
Ideas.... EDN is migrating links. This link is not verified. Search the "title"
+ "EDN" for new link. |
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Current-sense IC Prevents OverCurrent Damage - 04/25/96 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Cut Phone Line Detector - A while ago I got an email asking for the
schematic of a circuit to detect cut phone lines. It didn't take me long to find this
circuit in Electronics Now. When the circuit detects that a phone line has been cut,
it activates a MOSFET which can be used to drive a relay, motor, etc. It can also be
connected to a security system.... [Arron Cake] |
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Cut Phone Line Detector - This circuit speaks for itself. When the
phone line is okay, Q1 acts as a short with a very high ohms value via R1, R2, and R3
for a total of about 66 MegOhm so very high. When the phone line is cut (Tony van
Roon's open), it activates the MosFet (Tony van Roon's Q3) via transistor Q2 to drive
the load. Substitutes are fine, none of the components are critical.... [Tony
van Roon's circuit] |
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Tester Previous C's |
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