Amplifier Circuit

TEST_BENCH_AMPLIFIER

Published:2009/6/15 4:08:00 Author:May

This amplifier might be useful in senricing or bench testing as a signal tracer or as a building block in various systems.   (View)

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CURRENT_FEEDBACK_AMP_DELIVERS_100mA__100MHz

Published:2009/6/15 4:05:00 Author:May

Using a NS LM6181, this IC is useful in cable drivers. The supply voltage is ±5V to ±15V.   (View)

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V__I_PROTECTED_INTRINSICALLY_SAFE_OP_AMP

Published:2009/6/15 4:05:00 Author:May

The circuit is designed to drive an external load. A fault condition in the external load circuit could feed excessive current or voltage back into the line drive circuit. If excessive voltage appears from the load, the two zener diodes will clamp that voltage to a safe level, which in this case is 10V.The current in the zener diodes, op amp, and the remainder of the circuitry is limited to a safe level by resistors R1, R2, and R3. D1 protects the op-amp output stage from 10V appearing across the clamp diodes under a fault condition.The advantage of this circuit is that, although it's designed as unity gain buffer, the same tech-niques can be applied to inverting, noninverting, or differential gain stages.   (View)

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DISCRETE_CURRENT_BOOSTER_AMPLIFIER

Published:2009/6/15 3:48:00 Author:May

Suitable as a line driver, this circuit is useable in many similar audio applications.   (View)

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500_MΩ_INPUT_IMPEDANCE_WITH_JFET_AMP

Published:2009/6/15 3:47:00 Author:May

A current source using a 2N3904 transistor plus bootstrapping, achieves an input impedance of 500MΩ. A second 2N3904 transistor can be added at X to lower the output impedance.   (View)

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NONINVERTED_UNITY_GAIN_AMPLIFIER

Published:2009/6/15 3:33:00 Author:May

An op amp can be used as a unity gain am-plifier by connecting its output to its inverting input as shown. R1 should be low enough so the bias current of the op amp does not cause an ap-preciable offset.   (View)

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PUSH_PULL_DARLINGTON_AMPLIFIER

Published:2009/6/15 3:32:00 Author:May

This circuit has a high-Z input and push-pull output via the output taken across R4 and R6.   (View)

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FET_AMPLIFIER_WITH_OFFSET_GATE_BIAS

Published:2009/6/15 3:31:00 Author:May

In this amplifier circuit, the gate of the MPF102 is biased with an external voltage. This circuit achieves tighter control of the operating point and biasing conditions.   (View)

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ELECTRET_MIKE_PREAMP

Published:2009/6/15 3:18:00 Author:May

This circuit is suitable for using an electret microphone for many applications. A 1.5-V bat-tery is used. C1 and R3 provide treble boost/bass cut; they can be eliminated, if desired.   (View)

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JFET_AMP_WITH_CURRENT_SOURCE_BIASING

Published:2009/6/15 3:18:00 Author:May

A current source (MPF102) in the source lead of bipolar transistor 2N3906 permits accurate control of drain current.   (View)

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UNITY_GAIN_NONINVERTING_AMPLIFIER

Published:2009/6/15 3:17:00 Author:May

Biasing methods for an N-channel MOSFET to form a unity-gain noninverting amplifier or source-follower.   (View)

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JFET_SOUTCE_FOLLOWER

Published:2009/6/15 3:03:00 Author:May

The circuit uses positive gate bias to improve the operating point for better dynamic range.   (View)

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30_MΩ_JFET_SOURCE_FOLLOWER

Published:2009/6/15 3:01:00 Author:May

This JFET source-follower uses an MPF102 with offset biasing. It has an input impedance of >30MΩ   (View)

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BOOTSTRAPPED_SOURCE_FOLLOWER

Published:2009/6/15 2:58:00 Author:May

This bootstrapped Source follower uses an N-channel MOSFET.It has a high input impedance.   (View)

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MOSFET_HIGH_IMPEDANCE_BIASING_METHOD

Published:2009/6/15 2:54:00 Author:May

High-impedance biasing method for an N-channel MOSFET to form a linear-inverting amplifier.   (View)

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NONLINEAR_OPERATIONAL_AMPLIFIER_WITH_TEMPERATURE_COMPENSATED_BREAKPOINT

Published:2009/6/15 2:53:00 Author:May

  (View)

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INVERTING_SUMMING_AMPLIFIER

Published:2009/6/15 2:38:00 Author:May

The out put of U1 is the sum of V1, V2, and V3, multiplied by R1/R4, R1/R4, and respectively. R1, R2, R3 are selected as required for individual gains. R4 affects gain of all these inputs.   (View)

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FAST_INVERTING_AMPLIFIER_WITH_HIGH_INPUT_IMPEDANCE

Published:2009/6/15 2:27:00 Author:May

U1 is used as a voltage follower to feed in-verter U2. Because UI is in the voltage-follower configuration, it exhibits a high input impedance.   (View)

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DIFFERENCE_AMPLIFIER

Published:2009/6/15 2:25:00 Author:May

By using two inputs as shown, a difference amplifier yielding the differential between U1 and U2, times a gain factor results.   (View)

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PARALLEL_LOOP_ALARM

Published:2009/6/14 21:39:00 Author:jailer

Four paraJlel switches are used to monitor four positions. When a closure occurs on any switch, SCR1 triggers, which sounds the alarm.The alarm should be of the noninterrupting type.   (View)

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