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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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Circuit lets you test sample-and-hold amplifiers - 4-Mar-10 Issue
of EDN Measure voltage drop with a digital voltmeter.... [Design Idea
by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia] |
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Circuit measures currents in DC servo motor - 6-Dec-01 Issue of
EDN The simple circuit design in Figure 1 lets you measure all
components of a current flowing in a dc servo motor. The rectified output of
the circuit uses ground as a reference, so you can measure the... [Design
Idea by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior, India] |
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Circuit monitors AC Power Loss - 11/24/99 EDN-Design Ideas.... EDN
is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Circuit Monitors Multiple Contact Closures - 02/15/96 EDN-Design
Ideas.... EDN is migrating links. This link is not verified. Search
the "title" + "EDN" for new link. |
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Circuit monitors quad supply for PCI systems - 08/19/99 EDN-Design
Ideas....Many modern systems operate with multiple power supplies that must
meet tight tolerances to accommodate high-end µPs and peripherals. For
instance,.... EDN is migrating links. This link is not verified.
Search the "title" + "EDN" for new link. |
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Circuit Produces a Less than 25 Nsec Pulse - 05/11/00 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Circuit provides accurate RTD measurements - 04/12/01 EDN-Design
Ideas....The circuit in Figure 1 is an efficient measuring circuit for PT100 RTD
elements. IC1 provides an accurate 2.5V output and, together with P1 and R1,
also provides a stable 1-mA current to the RTD element. The outputt.….PDF contains
multiple circuits, scroll to find this circuit.... [Design Idea by Tito Smailagich,
ENIC, Belgrade, Yugoslavia] |
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Circuit Provides High-Side Current-sensing - 04/24/97 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Circuit provides simpler power supply sequence testing - 3-Dec-09 Issue of
EDN New circuit improves on an earlier power-sequence-testing idea.... [Design
Idea by Dan Karmann, DLK Engineering, Thornton, CO] |
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Circuit Serves as Milliohm Meter - 04/15/04 EDN-Design Ideas....When I was
recently debugging a design, I discovered that a short circuit existed from a ground
plane to a power plane. I did not have access to a milliohm meter or an equivalent
tester for locating this type of short circuit. So, I logged onto the Internet to find
an easily constructible milliohm meter.... EDN is migrating links. This link is not
verified. Search the "title" + "EDN" for new link. |
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Circuit tests VCOM drivers - 11-Nov-04 Issue of EDN Flat-panel LCD
monitors offer excellent image quality andcompact form factor than CRTs—hence, their
steadily increasing popularity. Unfortunately, the complexity of their manufacturing
process makes LCD monitors considerablyexpensive than CRTs. The amplifier that drives
VCOM, the voltage on the backplane of the LCD panel, must be able to drive large
capacitive loads, deliver h.... [Design Idea by Soufiane Bendaoud, Analog Devices, San
Jose, CA] |
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Circuitry for Inexpensive Relative Humidity Measurement - National
Semiconductor Application Note 04-Nov-1995 (app note added 6/06) |
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