Amplifier Circuit

PROTECTIVE_DIODES_FOR_SCHMITT_TRIGGER

Published:2009/7/23 21:25:00 Author:Jessie

Addition of diodes D2 and D3 to modified Schmitt trigger having isolating diode D1 prevents reverse breakdown of emittor-base junction of Q1.-J. Gaon, Diode and Resistor Increase Input Resistance of Schmitt, Electronics, 39:12, p 110-111.   (View)

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True_logarithmic_IF_amplifier

Published:2009/7/23 21:25:00 Author:Jessie

The SL531 shown here is a wide-band amplifier for use in IF circuits or strips ofthe true log type(where input and output are at the same frequency and nodetection Occurs) With the values shown,the frequency range is 10 to 200 MHz.An SL560 is used as a unity-gain buffer, the output of the log strip being attenuated before the SL560 to give a nominal 0-dBm output into 50Ω. The low-level gain is 60 dB with an output dynamic range of 20 dB.   (View)

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PNPN_SHIFT_REGISTER

Published:2009/7/23 21:24:00 Author:Jessie

Consists of five one bit memory elements connected in cascade.-J. B. Hangstefer and L. H. Dixon, Jr., Triggered Bistable Semiconductor Circuits, Electronics, 32:35, p 58-60.   (View)

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TYPICAL_SCHMITT_TRIGGER

Published:2009/7/23 21:21:00 Author:Jessie

Performs well at frequencies up to 100 kc. Capacitor may be removed for low-frequency operation. Widely used to produce square wave from sinusoidal input, because regenerative circuit changes states abruptly when input signal crosses specific d-c triggering levels.-Texas Instruments Inc., Transistor Circuit Design, McGraw-Hill, N.Y., 1963, p 382.   (View)

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SIMPLIFIED_UJT_SCR_TRIGGER

Published:2009/7/23 21:30:00 Author:Jessie

Emitter timing circuit and base-2 of ujt are supplied directly from ac line, with dropping resistor RD keeping peak voltage on ujt within specifications.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 329.   (View)

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Low_noise_preamplifier

Published:2009/7/23 21:29:00 Author:Jessie

Figure 2-5A shows an SL560 used as a preamplifier.Figure 2-5B shows the typical frequency response.   (View)

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500_KC_SCHMITT_TRIGGER

Published:2009/7/23 21:29:00 Author:Jessie

Used for wave form restoration, signal level shifting, squaring, and d-c level detection. Q1 conducts if input is more negative than -5 v. Q2 conducts when input is more positive than -2 v. Operating range is -55 to 71℃.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 200.   (View)

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Analog_multiplier

Published:2009/7/23 21:29:00 Author:Jessie

The output of this circuit is equal to input A times input B times 100, using the values shown.   (View)

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Low_noise_wideband_amplifier_with_AGC

Published:2009/7/23 21:28:00 Author:Jessie

This circuit combines an SL550 (amplifier with external gain control) and an SL560 (low-noise amplifier) to form a very simple wideband amplifier with AGC.   (View)

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Input_amplifier_for_a_4_1_2_digit_voltmeter_

Published:2009/7/23 21:27:00 Author:Jessie

This circuit provides an approximate 10-MΩ input impedance, and can be used with any 1-V full-scale A/D converter.   (View)

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Basic_inverting_amplifier

Published:2009/7/23 21:34:00 Author:Jessie

This circuit shows an LM107 that is connected in the classic inverting-amplifier configuration, where VOUT is opposite to VIN (if VIN goes positive, VOUT goes negative, and vice versa). The amplitude of the output depends on the ratio of R1 and R2 (within the limits of the supply voltage), and R3 is selected to equal the parallel resistance of R1 and R2.   (View)

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N_STAGE_RING_COUNTER

Published:2009/7/23 21:32:00 Author:Jessie

Uses modified memory circuit, in which input pulse turns off all pnpn stages except that following on stage.-J. B. Hangstefer and L.H. Dixon, Jr., Triggered Bistable Semiconductor Circuits, Electronics, 32:35, p 58-60.   (View)

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Tracking_positive_and_negative_voltage_references

Published:2009/7/23 21:32:00 Author:Jessie

This circuit provides both positive and negative that remain constant, in spite of changes in source voltage or VS.   (View)

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Low_noise_high_gain_amplifier

Published:2009/7/23 21:31:00 Author:Jessie

Figure 2-7A shows an SL560 used as a direct-coupled-coupled high-gain amplifier. Figure 2-7B shows the typical frequency response.   (View)

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POWER_FLIP_FLOP

Published:2009/7/23 21:31:00 Author:Jessie

Delivers square wave output pulse of 1 amp when pnpn unit is triggered on by low-level positive pulse applied to its base.-J. B. Hangstefer and L. H. Dixon, Jr., Triggered Bistable Semiconductor Circuits, Electronics, 32:35, p 58-60.   (View)

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Precision_current_monitor

Published:2009/7/23 21:30:00 Author:Jessie

This circuit produces an output voltage that is proportional to the current that is applied to the load RL.   (View)

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Low_noise_wide_bandwidth_ampliffer

Published:2009/7/23 21:30:00 Author:Jessie

Figure 2-6A shows an SL560 used as a wide-bandwidth amplifier.Figure 2-6B shows the bypical frequency response.   (View)

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AFC_FOR_F_M_TUNER

Published:2009/7/23 21:43:00 Author:Jessie

Obtained by amplifying change in output from ratio detector as caused by local oscillator drift, and applying resulting error signal to voltage-tunable ferroelectric capacitor in local oscillator through d-c amplifier,-T. W. Butler, Jr., Ferroelectrics Tune Electronic Circuits, Electronics, 32:3, p 52-55.   (View)

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TV_AUDIO_AMPLIFIER

Published:2009/7/6 2:10:00 Author:May

The amplifier picks up the TV's audio output signal and amplifies it to drive a set of earphones for private listening. It is built around an LM324 quad op amp and an LM386 low-power audio amplifier. The circuit uses an inexpensive electret microphone element as the pick-up and a set of earphones as the output device.   (View)

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SPEAKER_AMPLIFIER_FOR_HAND_HELD_TRANSCEIVERS

Published:2009/7/6 2:08:00 Author:May

The LM383 is an audio-power amplifier that is capable of producing up to 8W of audio output. R1 is essentially a load resistor for the hand-held transceiver's audio output. R2 can be composed of two fixed resistors in a 10:1 divider arrangement, but using a potentiometer makes it easy to set the amplifier's maximum gain. When powered from a vehicle's electrical system, the amplifier's +12V power source requires filter L1 to eimtnate alternator whine. The LM383 can be mounted directly on the heatsink because the mounting tab is at ground potential.   (View)

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