Testers or Instruments Electronic Circuits, beginning with C's

Tester or Instrumentation Circuits, Page 3
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: Friday, March 12, 2010 12:07 PM

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.

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....

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...

Clear Fluid Detector #2
Using an ultra low power technique, this circuit detects when a clear fluid is inside a piece of clear plastic tubing. It can be used for fluid level control and monitoring.

Clear Fluid Detector
This circuit detects when a clear fluid is inside a piece of clear plastic tubing. It can be used for fluid level control and monitoring.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Cable Tester - (electronic design added 6/07)

Cable Tester is Fast and Cheap - 09/24/98 EDN-Design Ideas: (design idea added 3/03)

Calibrate scope jitter using a Transmission line loop - 09/20/01 EDN-Design Ideas: Digital-clock-period jitter is variation in period of a clock cycle compared with a nominal (average of many cycles)clock period. To accurately measure period jitter using an oscilloscope, you must subtract oscilloscope jitter from measured jitter. However, oscilloscopes rarely have a jitter specification, so you must determine oscilloscope jitter.....(design idea added 1/05)

Calibrating the MTA11200 System - Microchip Application Note Published 26-Aug-97 (app note added 2/06)

Calibration of a 3-Phase Energy Meter Board on the ADE7754 - AN-624 Analog Devices Application Notes (app note added 6/06) The document describes how to implement calibration of a polyphase meter based on ADE7754 energy metering IC.

Calibration Technique uses Sound - 09/01/98 EDN-Design Ideas: (design idea added 3/03)

Capacitance Meter - This project is more complex than the others described earlier. However, when finished, you will have an instrument capable of measuring all but the largest capacitors used in radio circuits. Unlike variable resistors, most variable capacitors are not marked with their values. As well, the markings of capacitors from salvaged equipment often rub off....(electronic design idea added 09/08)

Capacitance meter (a.van.waarde) - Every home constructor should own at least two pieces of test equipment: a digital (or analog) multimeter and a simple frequency counter. Most digital multimeters can measure capacitance, but the capacitance range is rather limited…(schematic / circuit added 05/07)

Capacitance meter (Colin Mitchell) - This simple add-on capacitance meter has been specially designed to help you identify capacitors from 1p to 10u….(schematic / circuit added 05/07)

Capacitance Meter (Elm-chan) - This is a simple capacitance meter which can measure capacitance value easy. There are some measurement methods for capacitance, at one time the capacitance was measured with a impedance bridge or a dip meter….(circuit added 9/04)

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. ….(designed by David A. Johnson)

Car battery tester -

Cardiac Monitor - (electronic design added 02/03/04)

CD strobe scope - This is a strobe scope. The disc is rotating but it looks still. (added 10/05)

CDV700 Geiger Counter Probe Rebuilding - (electronic design added 6/07)

Cell Cycler Sorting Sires Superior Batteries - 06/23/94 EDN-Design Ideas: To assemble superior NiCd batteries, you need to form and match individual cells making up a battery. First, formation takes place in a NiCd cell only after numerous charge-discharge cycles. Second, you must collect voltage data during se cycles to match up cells having uniform characteristics.....(design idea added 3/03)

Cheap and easy inductance tester uses few components - 04/12/07 EDN-Design Ideas: This circuit plus a frequency counter or oscilloscope measures unmarked inductors.....(design idea added 05/06/07)

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.... ….(designed by David A. Johnson)

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... ….(designed by David A. Johnson)

Cheap pushbutton replaces rotary switch - 10/26/00 EDN-Design Ideas: / PDF contains multiple circuits, scroll to find this circuit The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's V P and I DSS variations. These manufacturi.....(design idea added 07/03)

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