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$5 junk box circuit determines phase sequence : 04/23/98 EDN-Design Ideas /
(added 11/05) [Note: File contains multiple circuits scroll to find this
circuit.] Have you ever wondered which way a blower motor is going to turn when
you plug it into anor socket, or have you ever inherited task of modifying
three-phase wiring in your plant? circuit in Figure 1 is a simple, approximately
$5 phase ... |
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(9435) PCI Performance Measurements - Concepts and Practical Application:
Agilent Application Note (app note added 6/06) |
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µC measures High-frequency signals : 03/02/98 EDN-Design Ideas /
(added 6/06) |
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1 GHz Frequency Counter: Used with transmitters, receivers in VHF/UHF band
(16F84, SAB6456) (circuit added 8/06) |
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10 Hints for Making Better Network Analyzer Measurements: Aligent App Note
(added 2/06) |
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10 Hints for using Your Power Supply to Decrease Test Time (5968-6359E):
Learn ten simple ways to improve your testing capabilities with your power supplies
and electronic loads. Aligent Application Note (app note added 4/08) |
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10Hz - 100KHz D.D.S. Function Generator: (electronic circuit added 05/07) |
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10Hz - 1300MHz Frequency Meter: Universal VHF/ UHF frequency meter (circuit
added 8/06) |
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16-Bit ADC Simplifies Current Measurements: DN341 Design Notes (Linear
Technology) (app note added 6/06) |
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1-Wire Humidity Sensor: App Note 758: Maxim IC (application note
added6/06) |
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20MHz High Speed Function Generator: High Speed Function Generator was
published in professional electronics section of Aug 1996 issue of
Electronics Australia, and has proven to be extremely popular. kit is no longer
available from any of kit suppliers… (circuit added 8/06) |
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220 Volt Wiring Detector: This circuit senses power lines behind walls
(added 9/04) |
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220/230VAC Input 12VAC Output 100VA Max Halogen Converter: Fully Assembled
and Tested demo board CD including datasheets, application notes and ballast design
software Features: Short Circuit and Overload Protection, Fully dimmable with all
dimmer types, Compensated Load Regulation, Over temperature shutdown, EMI Filter
(added 3/05) |
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24-Bit ADC Measures from DC to Daylight: DN219 Design Notes (Linear
Technology) (app note added 6/06) |
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25 k Volt Generator Tests Insulation: 06/04/98 EDN-Design Ideas /
(added 09/05) To generate high voltages with proper insulation between "hot
node" and rest of circuitry, a car ignition coil can function in place of
a high-voltage transformer. se coils have voltage ratings of approximately 20 kV, so
you can use m to produce voltages around this value. Because you know turns
ratio of coil, you can make a stable high-voltage source using a well-controlled
voltage at primary side (Figure 1). |
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250mW HF CW Transmitter: (circuit / schematic design added 6/06) |
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3 GHz Divide by 1000 Prescaler: Converts 0.1 |
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3 Level Audio Power Indicator #2: Battery-operated Three LED display that
connect it to loudspeaker output (added 5/02) |
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3 Level Audio Power Indicator: Battery-operated3 LED display that connect it
to loudspeaker output (added 9/04) |
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3.3V converter delivers 3W from Li-ION battery : 11/05/98 EDN-Design Ideas
/ (added 6/06) Lithium-ion batteries are rapidly gaining popularity in portable
applications because of ir superior energy density, low self-discharge rate, and high
cell voltage. When you use one Li-ion battery to power a 3.3V dc/dc converter;
however, you encounter a problem, because battery voltage can be higher or lower than
3.3V. When fully charged, a Li-ion cell has approximately 4.2V output; when fully
discharged, voltage is approximately 2.5V. refore, you cannot use a simple buck
or boost topology with a single inductor to generate a regulated 3.3V output. Some
designs boost voltage to approximately 4.3V and n use a low-dropout regulator to
produce 3.3V. This approach is inefficient, and efficiency is a crucial
consideration in battery-powered applications. circuit in Figure 1 offers a
solution to problem.... |
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3.3V lithium cell supply requires one inductor: 08/05/99 EDN Design Ideas /
(added 6/06) 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. fact that output of a Li-ion battery
ranges above and below 3.3V during its discharge cycle complicates design. |
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30 Meter QRP Transmitter for Morse Code: (circuit / schematic design added
6/06) |
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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-digit Volt / Amper Meter: Based on CA3161, CA3162 ICs (circuit added 8/06)
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