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| Links to electronic circuits, electronic
schematics, designs for engineers, hobbyists, students & inventors: |
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Reducing RFI Rectification Errors in In-Amp Circuits: AN-671 - Analog
Devices Application Notes (added 2/06) |
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Resistance, DC Current, AC Current and Frequency and Period Measurement Errors in
Digital Multimeters (AN-1389-2): Agilent Application Note (Circuit / schematic design added 6/06) |
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Scheme provides high side Current sensing for White LED Drivers: 02/19/04
EDN Design Ideas / (added 1/05) White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as
cellular phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To
forward-bias these LEDs, a voltage of 10 to 16V comes from an inductor-based boost regulator, such as an SP6690.... |
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Simple circuit provides high side Current sensing: 04/24/97 EDN-Design
Ideas / (added 8/03) |
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Solar Current Meter: (added 9/02) |
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Strain Gage Measurement using an AC Excitation: AN-683 - Analog Devices
Application Notes (added 2/06) |
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Topics on using the LM6181-A New Current Feedback Amplifier: National
Semiconductor - Application Note (added 2/06) |
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Transmitter accurately Transfers Voltage input: 05/15/03 EDN Design Ideas
/ (added 1/05) When you connect remote sensors to a central process controller, a simple, robust, and commonly used interface is
the 4- to 20-mA loop. The advantages of this current loop include the simplicity of just two twisted wires that share both power and signal,
the loop's high noise immunity in harsh environments, and the de facto loop standard within the process-control industry.... |
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Two Sensors Measure Three Line Currents: 09/01/95 EDN-Design Ideas /
(Electronic Schematic / circuit added 4/02) |
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Voltage Reference improves JFET: 10/26/00 EDN-Design Ideas / (added
05/03) /The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's VP and IDSS variations.
These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a fixed R1. Most users of
JFET current-sources sample VP and IDSS for each lot of JFETs and then select R1 by first solving the quadratic equation ID=IDSS(1–VGS/VP)2
for VGS and then solving the current-setpoint equation ISOURCE=VGS/R1. After completing these lot-specific calculations, the accuracy error
for ISOURCE can be less than ±15%. In addition to initial accuracy error at ambient, the VGS overtemperature performance limits the current
temperature drift to 0.3%/°C. The temperature dependence of VGS is a function of both the mobility variation of IDSS with IDSS
negative-temperature coefficient and the built-in potential of VP's positive coefficient. VGS has one ID operating point at which it has a
zero temperature coefficient, but this one current setpoint is probably not the one that you wanted. With resistors commonly available at
0.1%, 25 ppm/°C grade, R1 will be a small contributor to any errors in the current setpoint. Compliance voltage across the current source is
VGS to BVDSS. The output impedance, RO, for this current source is approximately 1 MΩ. You can improve RO to approximately 10 MΩ by adding
another JFET in a cascode configuration..... |
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Ways to Optimize the Performance of a Difference Amplifier: AN-589 -
Analog Devices Application Notes (added 2/06) This Application Note presents several ways to build and optimize the performance of a
discrete difference amplifier. It also recommends amplifiers that will make the overall solution cost/performance competitive with monolithic
instrument amplifiers. |
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Current Monitors / Sensors/ Detectors:
#-B C D-Q
R-Z |
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