Electrical Equipment Circuit

WIDEBAND_HIGH_CREST_FACTOR_RMS_TO_DE_COMVERTER

Published:2009/6/25 2:26:00 Author:Jessie

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POWER_VOLTAGE_TO_CURRENT_CONVERTER

Published:2009/6/25 2:17:00 Author:Jessie

Low cost converter is capable of supplying constant ac currents up to 1 A over variable loads.   (View)

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BUTLER_COMMON_BASE_OSCILLATOR_BASIC_CIRCUIT

Published:2009/6/25 2:17:00 Author:Jessie

Circuit Notes This circuit operates at or near series resonance. It has fair to poor circuit design with parasitics, touch to tune, and fair frequency stability.   (View)

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CALCULATOR_TO_STOPWATCH_CONVERTER

Published:2009/6/25 2:17:00 Author:Jessie

This circuit can be fitted to any calculator existing with an automatic constant to enable it to be used as a stop-watch. The 555 timer is set to run at a suitable frequency and connected to the existing calculator battery via the push-on push-off switch and the existing calculator on-off switch.   (View)

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BUTLER_EMITTER_FOLLOWER_OSCILLATOR_BASIC_CIRCUIT

Published:2009/6/25 2:16:00 Author:Jessie

Circuit Notes This circuit operates at or near series resonance. It is a good circuit design with no parasitics. It is easy to tune with good fre-quency stability.   (View)

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COLPITTS_HARMONIC_OSCILLATOR（BASIC_CIRCUIT）

Published:2009/6/25 2:14:00 Author:Jessie

Circuit NotesThis circuit operates 30-200 ppm above series resonance. Physically simple, but analytically complex. It is inexpensive with fair frequency stability.   (View)

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BUTLER_EMITTER_FOLLOWER_OSCILLATOR（100_MHz）

Published:2009/6/25 2:13:00 Author:Jessie

Circuit NotesThis circuit has good performance without any parasitics because emitter follower amplifier has a gain of only one with built-in negative feedback to stabilize its gain.   (View)

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CURRENT_TO_VOLTAGE_CONVERTER

Published:2009/6/25 2:12:00 Author:Jessie

Converter features eight decades of cur-rent range. The circuit is intended to be used with the 200.0 mV range of a DVM.   (View)

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PIERCE_HARMONIC_OSCILLATOR20_MHz

Published:2009/6/25 1:57:00 Author:Jessie

Circuit NotesThis circuit has excellent short term frequency stability because the external load tied across the crystal is mostly capacitive rather than resistive, giving the crystal a high in-circuit Q.   (View)

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COMPARATOR

Published:2009/6/25 1:56:00 Author:Jessie

An operational amplifier is used as a comparator which is capable of driving approximately 10 logic gates.   (View)

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COMPARATOR_WITH_HYSTERESIS

Published:2009/6/25 1:55:00 Author:Jessie

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CRYSTAL_CONTROLLED_TRANSISTOR_OSCILLATOR_

Published:2009/6/25 1:54:00 Author:Jessie

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HIGH_IMPEDANCE_COMPARATOR

Published:2009/6/25 1:54:00 Author:Jessie

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PRECISION_DUAL_LIMIT_GO_NO_GO_TESTER

Published:2009/6/25 1:53:00 Author:Jessie

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LIMIT_COMPARATOR_1

Published:2009/6/25 1:51:00 Author:Jessie

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TEMPERATURE_COMPENSATED_CRYSTAL_OSCILLATOR

Published:2009/6/25 1:51:00 Author:Jessie

Circuit NotesTwo different negative-coefficient capacitors change in capacitance to counteract or compensate are blended to produce the desired for the decrease in frequency of the normal AT-cut characteristics.   (View)

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WINDOW_COMPARATOR_DRIVING_HIGH_LOW_LAMPS

Published:2009/6/25 1:40:00 Author:Jessie

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HIGH_POWER_CONTROLFOR_SENSITIVE_CONTACTS

Published:2009/6/25 1:40:00 Author:Jessie

Two simple arrangements for resistive loads are shown in A & B. The circuit in A will provide load power when the actuating contact is closed, and no power when the contact is open. B provides the reierse of this action－power being supplied to the load when the contact is open with no load power when the contact is closed. If desired, both circuits can be made to latch by operating with dc instead of the indicated ac supply. In both of these circuits, voltage across the sensitive contacts is under 5 volts, and contact current is below 5 mA. For inductive loads, R1 would normally be returned to the opposite side of the load as shown in C.   (View)

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WINDOW_COMPARATOR

Published:2009/6/25 1:39:00 Author:Jessie

This circuit gives an output (which in this case is 0V) when an input voltage lies in be-tween two specified voltages. When it is out-side this window, the output is positive. The two op amps are used as voltage comparators. When Vin is more positive than Vref (upper) the output of IC1 is positive and Dl is forward biased. Otherwise the output is negative, D1 reverse biased and hence Vout is 0V. Similarly, when Vin is more negative than Vref (lower), the output of IC2 is positive; D2 is forward biased and this Vout is positive. Otherwise Vout is 0V. When Vin lies within the window set by the reference voltages, Vout is 0V.   (View)

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HIGH_LOW_LIMIT_ALARM

Published:2009/6/25 1:38:00 Author:Jessie

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