Testers or Instruments electronic circuits, beginning with A-B's

Tester or Instrumentation Circuits, Page 2
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. :

ACCEPTABLE VOLTAGE INDICTOR
I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed. The circuit can also be used to adjust a particular voltage be within specific high or low limits. The three LEDs will indicate if the voltage is high, low or OK. When connected to other converters, such as a frequency to voltage converter, a current to voltage converter or a power to voltage meter, it could provide a quick indication of a proper level.

BROAD BAND 2MHz OPTICAL FIBER RECEIVER
If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector.

BROAD BAND 5MHz OPTICAL FIBER RECEIVER
This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz. It is great for experimenting with various modulated light sources.

BROAD BAND 50MHz OPTICAL FIBER RECEIVER VERSION A
If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard BNC plug. When the box is plugged into to the input of an oscilloscope with a 50-ohm termination resistor, it can detect light pulse frequencies beyond 100MHz.

Brownout Voltage Tester
I used this circuit years ago to test AC line powered devices under 95vac line voltage conditions. It has a rating of 250 watts.

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

A 3-Phase Power Meter Based on the ADE7752 - AN-641 Analog Devices Application Notes (app note added 6/06)

A 4 to 20 mA loop needs no external power source - 09/13/01 EDN-Design Ideas: The simple circuit in Figure 1 uses a low-current-drain MAX407).....(design idea added 11/05)

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

A Guide to the Design of Current Feedback Control / AN-4109 - Fairchild Application Notes / (app note added 6/06)

A Low Cost Tamper-Resistant Energy Meter Based on the ADE7761 with Missing Neutral Function - AN-687 Analog Devices Application Notes (app note added 6/06)

A Low Cost Watt-Hour Energy Meter Based on the AD7755 Chinese Version -5/2000 - AN-559 Analog Devices Application Notes (app note added 6/06)

A Low Cost Watt-Hour Energy Meter Based on the ADE7755 - AN-559 Analog Devices Application Notes (app note added 6/06)

A Low Cost Watt-Hour Energy Meter Based on the ADE7757 - AN-679 Analog Devices Application Notes (app note added 6/06)

A Precision Wideband Current Probe for LCD Backlight Measurement - DN101 Design Notes (Linear Technology) (app note added 1/06)

A simple Remote control Tester - (electronic circuit added 10/05)

A Tamper-Resistant Watt-Hour Energy Meter - AN-563 Analog Devices Application Notes (app note added 6/06) Based on ADE7751 and Two Current Sensors

A Tamper-Resistant Watt-Hour Energy Meter Based on the AD7751 - AN-574 Analog Devices Application Notes (app note added 6/06) With a Current Transformer and a Low Resistant Shunt

AC continuity tester finds single ended faults in cables - 02/21/08 EDN-Design Ideas: A continuity tester injects an AC signal into the conductors of a cable to find circuit faults.

AC Current Monitor - The hobby circuit below shows how a small current transformer from Magnetek can be used to monitor AC current to a load. The AC voltage developed at the secondary of the transformer can be scaled so it can be read by any digital multimeter. The transformer is rated at 30 amps. ….(designed by David A. Johnson)

AC Line Current Detector - This circuit will detect AC line currents of about 250 mA or more without making any electrical connections to the line. Current is detected by passing one of the AC lines through an inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800 turns of #30, #35 magnet wire. The pickup could be made from other iron type rings or...(electronic schematic / circuit added 4/02)

AC power monitor uses remote sensing - 04/26/01 EDN-Design Ideas: (design idea added 6/06)

AC Voltmeters and ammeters - Electronic circuit design (added 02/05)

Acceleration meter for cars - This circuit it is count the acceleration from -1000mg up to +1000mg. Can be used in lot of applications like cars, elevators, ramps and more.….(electronic schematic added 03/09)

Acceleration Monitor using ADXL202 and AVR - (circuit / schematic design added 6/06)

Acceptable Voltage Indictor - I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed. The circuit can also be used to adjust a particular voltage be within specific high or low limits. The three LEDs will indicate if the voltage is high, low or OK. When connected to other converters, such as a frequency to voltage converter, a current to voltage converter or a power to voltage meter, it could provide a quick indication of a proper level. ….(designed by David A. Johnson)

Accurate Digital LC Meter - Based on PIC16F84A microcontroller, 16x1 LCD and LM311 IC (circuit added 8/06)

Accurate Digital LC Meter - Most accurate and simplest LC inductance / capacitance Meter that you will find. It allows you to measure incredibly small inductances starting from 10nH to 1000nH, 1uH to 1000uH, 1mH to 100mH and capacitance from 0.1pF up to 900nF. ….(design added 11/08)

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