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Tester or
Instrumentation
Circuits, Page 1b
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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. : |
- 1 AMP
CURRENT INJECTOR
When you need to measure resistance down to a few micro ohms, this circuit works
great. It is powered from two "C" cell batteries and is designed to inject a
well-regulated one amp of current into the unknown resistance. By measuring the
voltage drop across the resistor with a digital voltmeter, the resistance value can
be accurately measured. The circuit also is equipped with a low battery monitor.
Published in Popular Electronics, November 1992
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- 120vac
Under Voltage Tester
Using a cheap 24vac transformer, this circuit can test a product under low 95vac
conditions. With the components show, it has a rating of 250 watts max.
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- 20MHz VCSEL
3mW LASER TEST CIRCUIT
This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL)
that don’t require light output control circuits. The circuit shows how to drive the
device from a single high speed CMOS IC. The circuit can easily be modified to
transmit signals from kilohertz to about 50MHz.
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- 40KHZ LED
TEST SIGNAL GENERATOR
This 40KHz crystal controlled oscillator circuit drives an infrared LED with
powerful 40ma pulses. The circuit can be used to test optical communications
circuits, designed to receive 40KHz modulated light signals.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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3 - 12 MHz Signal Generator - amateur radio construction
projects…. [from Peter Parker's website] |
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3 Digits Digital Volt Meter with PIC16F676 - This is simple
3-digits digital volt meter.PIC16F676 used to read analog signal(voltage)
and display the value on 3-digits 7-segment. You can apply similar
principles to measure DC current with parallel R shunt. ….... |
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3 GHz Divide by 1000 Prescaler - Converts 0.1, 3 GHz freqency to
0, 3 MHz, extends frequency range measurements ….(design added 11/08)
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3 Level Audio Power Indicator - Battery-operated3 LED display that
connect it to loudspeaker output (added 04/02) |
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3.3V converter delivers 3W from Li-ion battery - 11/05/98 EDN-Design
Ideas....Lithium-ion batteries are rapidly gaining popularity in portable
applications because of their superior energy density, low self-discharge
rate, and high cell voltage. When you use one Li-ion battery to... [Design
Idea by David Salerno, Unitrode Corp, Merrimack, NH] |
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3.3V Lithium Cell Supply Requires One Inductor - 08/05/99 EDN-Design
Ideas....Because of growing popularity of lithium-ion (Li-ion]batteries and 3.3V
power supplies, portable-equipment designers must often create a 3.3V supply that a
single Li-ion cell can power.... [Design Idea by Matt Schindler and Jay Scolio, Maxim
Integrated Products, Sunnyvale, CA] |
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30 Meter QRP Transmitter for Morse Code - This transmitters' intended
purpose is for morse-code only in 30 meter band (Tony van Roon's 10Mhz).
It is a low-power QRP type and needs to be connected to your existing tranceiver.
harmonic rejections on prototype were measured at 40dB on 20Mhz and 50dB on
30Mhz.... [Tony van Roon's circuit] |
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300ma DC-to-AC Converter - This circuit was used to provide battery backup
to a device that had an AC (output) wall transformer. Due to quasi-sine-wave
output and imprecise 60Hz output frequency, some devices might not work properly. Peak
output is DC input voltage minus about 20 ohms drop. Use bigger output MOSFETS
for more current output. [Designed by Andrew R. Morris (added 6/06)]
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3-30 V/2.5 A Stabilized Power Supply - The power supply is using a well
known and quite popular VOLTAGE STABILIZER IC the LM 723. The IC can be adjusted for
out put voltages that vary continuously between 2 and 37 VDC and has a current rating
of 150 mA …..(electronic design added 6/07) |
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3-Digit DVM Voltmeter - Uses 3161, CA3162 ICs ….(design added 11/08)
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3-Digit Volt/ Amper Meter - Even if the digital multimeters have dominated
in a lot of applications, in the measurement, exist the need for existence of
instruments of clue in various appliances, voltage and current, as in power supply or
elsewhere. The circuits that give make this precisely the work, measure the voltage in
terminal a circuit and the current that passes in his. The circuit does not present
particular difficulties for somebody that has a small experience. The two circuits are
the himself, with a small difference only in their input, when they have they measure
voltage or current and in connection that concern decimal point. ….... |
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3-Phase Power Meter Based on the ADE7752 - AN-641 Analog Devices Application
Notes....[App Note] |
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