Testers or Instruments Electronic Circuits, beginning with C's

Tester or Instrumentation Circuits, Page 3c
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: Wednesday, November 29, 2017 05:38 AM

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.....

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:

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Comparison of Leading Switch/Measure Solutions - Agilent Application Note (added 6/06)

Component calculations & simulation tools for FAN5234 or FAN5236/ AN-6002 - Fairchild Application Notes / (app note added 6/06)

Component Reliability - Zetec Semiconductors Applications NotesThis note introduces basic reliability theory, failure rate analysis, and product qualification methods, and includes sample data and FITs values for a variety of test methods. (app note added 2/06)

Components Calculations & Simulation Tools for FAN6520A/ AN-6009 - Fairchild Application Notes / (app note added 6/06)

Connection Tester - A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections….. (added 1/03)

Conrad Electronics MM3610D multimeter cable pinout - (diagram added 05/07)

Constant Brightness LED Stroboscope: for Measuring the Speed of Small Motors - For measuring the speed of small motors. The rotary switch is available for $5.00USD as of 2003 from DigiKey under part number EG1951-ND or EG1952-ND. It is a real pain to operate this circuit without a proper switch. You can put multiple 4017 ring counters in series to reduce the duty cycle in order to obtain a more focussed strobe image but you will have to increase L or by using a regulator to power.... [Circuit by Stepan Novotill]

Constant Voltage Load Tests Battery Chargers - 04/11/96 EDN-Design Ideas.... EDN is migrating links. This link is not verified. Search the "title" + "EDN" for new link.

Contactless Mains Voltage Indicator - ....

Continuity Tester - This circuit senses only dead shorts on a populated board. It will not ring through or damage components. It shuts off when Continuity Tester - not in use. It was first published in Electronics Magazine June 21, 1979, page 145. [Designed by Andrew R. Morris]

Continuity Tester - This circuit will detect low resistances and high resistances to produce a tone from the speaker. It will detect up to 200k and the circuit automatically turns off when the probes are not used.

Continuity Tester - This circuit senses only dead shorts on a populated board. It will not ring through or damage components. It shuts off when not in use. It was first published in Electronics magazine, June 21, 1979, page 145.... [Designed by Andrew R. Morris]

Continuity Tester - Starting with a 9 volt supply, when the probes are shortcircuited there is a 8.2 volt drop across the zener diode Z1 leaving a maximum of 0.8 volt across R1. Application of Ohms' Law showse .… [Tony van Roon's circuit]

Continuity Tester - This is another invaluable piece of test equipment for digital work. It has been designed by us to cater for a particular application….(electronic circuit added 05/06)

Continuity Tester Latching - Awesome tester!at least in the designers opinion! [Tony van Roon's circuit]

Continuity Tester Smart - Occasionally you need a continuity test between two points in an electronic circuit. Unfortunately, most continuity testers are prone to "lie". They don't do that deliberately, but if they see a small resistance, they still tell you that you have continuity. They just don't know any better.…. [Tony van Roon's circuit]

Continuity Tester, Low-Voltage - Several simple circuits were tried -a lamp, battery and probes still demanded the attention of the eyes; replacing the lamp with a buzzer was more successful but needed some three to four volts and gave no indication of a series semiconductor.… [Tony van Roon's circuit]

Continuity Tester-essential for Digital projects - This is another invaluable piece of test equipment for digital work. It has been designed by us to cater for a particular application....servicing digital projects sent in for repair….(diagram added 05/07)

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