Circuit Diagram

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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GENERAL_PURPOSE_PREAMPLIFIER

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

Suitable for general audio use, the preamp circuit uses a feedback pair. Current gain is set by the ratio of (R4 + R6)/R4.   (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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AUDIO_TO_UHF_PREAMP

Published:2009/6/15 3:57:00 Author:May

The Signetics NE5204 or NE5205 can be used in this AF to 350-MHz (-30 dB) preamp. If 600MHz @ 3dB is needed, use the NE5205. The noise figure is 4.8dB at 75Ω, 6dB at 50Ω. Gain is approximately +20dB over the passband.   (View)

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FREQUENCY_COUNTER_PREAMP

Published:2009/6/15 3:56:00 Author:May

Based on the LM733 or NE592, the preamp shown has a bandwidth of 100 MHz. The FET inputs provide about 1-MΩ input impedance. Q4, Q5, and IC2 provide signal conditioning.   (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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GENERAL_PURPOSE_JFET_PREAMP

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

This JFET preamplifier has a gain of about 20dB and a bandwidth of over 100kHz. It is use-ful as a low-level audio amplifier for high-imped-ance sources.   (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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