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Window Comparator Circuits
Last Updated on: Friday, March 12, 2010 12:07 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Absolute Value Comparator Touts Accuracy Size - 03/07/02 EDN-Design Ideas: A
typical window comparator uses two comparators and a single op amp to determine wher a
voltage is inside or outside a boundary region. Figure 1 shows a typical
implementation. IC1 is an inverting op amp with a gain of –1. VREF and –VREF create
window limits. When VIN becomes more positive than VREF, output of IC2A goes
low.....(design idea added 1/05) |
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Design low duty cycle timer circuits - 08/22/02 EDN-Design Ideas: Designing
astable circuits using the industry-standard 555 timer is a straightforward process
when duty cycles are 50% or greater. However, you must overcome the many pitfalls of
low-duty-cycle circuits to arrive at a desired result. Using only ideal components
eases the design, but the components themselves are hard to obtain.....(design idea
added 1/05) |
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Electronic fuse emulates fast or slow Blow fuses - 11/09/00 EDN-Design
Ideas: The electronic-fuse circuit in Figure 1 combines the properties of a
current transducer and a solid-state relay to disconnect low power at preset levels.
Using this circuit lets you avoid the bother of stocking and replacing fusible links.
The circu.....(design idea added 7/03) |
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Expanded scale indicator revisited - 08/08/02 EDN-Design Ideas: The
visualization aid that a previous Design Idea describes allows only the expansion of
the upper end of the scale (Reference 1). But what can you do if, according to your
project requirements, you need to expand the middle region of the scale? Figure 1a
illustrates the challenge. A voltmeter comprises a 100-µA dc meter and a series
resistor.....(design idea added 1/05) |
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Missing codes tester checks 16 Bit ADC in 7 sec - 06/10/99 EDN-Design Ideas:
As the resolution of ADCs increases from 12 to 16 bits and higher, the difficulty in
testing the "nomissing-codes "specification grows proportionately. To fully guarantee
no missing codes for a 16-bit ADC requires testing all 2 16-1 possible
output.....(design idea added 7/03) |
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Two Buttons Provide Safe Start - 07/06/00 EDN-Design Ideas: The circuit in
Figure 1 provides a safety interlock that checks the actuation of two pushbuttons
before enabling a relay. When you push both buttons, the circuit actuates the relay.
At that point, you can release one of the switches without the relay'.....(design idea
added 7/03) |
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