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: Monday, October 03, 2011 06:07 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 Finder Seeks Out Wall Conduits - 05/11/00 EDN-Design Ideas When you debug home electrical wiring, a tool that determines the location of cable conduits comes in handy, especially when problems arise. Some tools, such as nylon or glass fiber guides, contain small magnets and compasses that act as sensor elements.... [Design Idea by Luis Miguel Brugarolas and Manuel RamÃ³n, Sire Sistemas y Redes Telematicas, Tres Cantos, Madrid, Spain]

Cable Tester - A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals, earth faults, continuity and all with four IC's. Designed initially for my intercom, but can be used with alarm wiring, CAT 5 cables and more.... [Andy Collison]

Cable tester is fast and cheap 09/24/98 EDN Design Ideas....The cable tester in Figure 1 uses a low-end 8-bit µC. The specific µC to use depends on the number of conductors in the cable you want to test. For the current application, two types of cables were under test, one with three conductors and another with seven. So, the Motorola 68HC705P9....contain several circuits, scroll to this one.... [Design Idea by Abel Raynus, Armatron International, Melrose, MA]

Cable tester uses LEDs to find faults - 22-Oct-09 Issue of EDN Test as many as 16 wires with LEDs as continuity indicators.... [Design Idea by Pavel Šádek, Apri, Roznov pod Radhoštem, Czech Republic]

Calibrate scope jitter using a transmission line loop - 20-Sep-01 Issue of EDN Digital-clock-period jitter is the variation in the 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 the oscilloscope jitter from the measured jitter. However, oscilloscopes rarely have a jitter specification, so you must determine the oscilloscope jitter.... [Design Idea by David Cuthbert, Micron Technology, Boise, ID]

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] 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....A number of Weidmuller Ltd's (www.weidmuller.com) products require output calibration for zero and span. Normally, a technician calibrates a product by monitoring a digital readout and adjusting the zero and span potentiometers in turn. Because the technician must concentrate so heavily on the readout, the....File has many circuits, scroll down.... [Design Idea by Aubrey Kagan, Weidmuller Ltd, Markham, ON, Canada]

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)

Tester Next C's

Testers: #'s A-B C D E F-G H-K L M-O P Q-R S T U V-Z