Amplifier Circuit

Ac_coupled_inverting_amplifier

Published:2009/7/23 21:41:00 Author:Jessie

This circuit is the ac versionof the basic dc circuit in Fig. 10-26.   (View)

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Ac_coupled_noninverting_amplifier

Published:2009/7/23 21:41:00 Author:Jessie

This circuit is the ac version of the basic dc circuit in Fig. 10-27.   (View)

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High_level_mixer

Published:2009/7/23 21:40:00 Author:Jessie

The SL6440,shown is a double-balanced mixer, for use in RF systems up to 150 MHz. External selection of the dc operating conditions is controlled by the resistor connected between pin 11 (bias) and VCC. Conversion gain for single-ended circuit of Fig. 2-10 is equal to: GdB 20 Log56.61+0.0785,RLIp, where Ip is programmed current at pin 11, and RL is dc load resistance.   (View)

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Single_chip_audio_amplifier_BTL_015W

Published:2009/7/23 23:55:00 Author:Jessie

This circuit make use of the bridge-tied load (BTL) principle to achieve low-voltage operation without sacrifice of output power ,The circuit operates with battery supplies from 6V down to 1.6V ,and draws low quiescent current (typically 3.2mA with 3-V supply).Closed-loop voltage gain is 32dB with connections, as shown (floating differential input ,3-Vsupply and 32-Ω load).Output is reduced to 0.14 when supply is reduced to 3V (with 32-Ω load).   (View)

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125_W_150_MHz_TMOS_FET_amplifier

Published:2009/7/23 22:59:00 Author:Jessie

This circuit uses an MRF174 TMOS FET, has a typical gain of 12 dB, and can survive operation into a 30:1 VSWR load at any phase angle with no damage. Notice that the output power can be reduced to loss than 1W continuously by driving the dc gate voltage negative (by adjusting R3). Figure 2-53B shows this performance feature.   (View)

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Differential_input_instrumentation_amplifier

Published:2009/7/23 21:45:00 Author:Jessie

This circuit uses three sections of a 4136 to form an instrumentation amplifier, where the common-mode rejection ratio depends on the matching of resistors.   (View)

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High_impedance_differential_amplifier

Published:2009/7/23 21:44:00 Author:Jessie

This circuit uses three sections of a 3404 op amp to form a high-impedance amplifier, where the output depends on the difference between V1 and V2, as well as the resistance ratios. By eliminating the input resistances (such as shown in Fig. 10-29), input impedance depends on the 3404 alone.   (View)

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AC-Coupled Differential Amplification Principle Circuit

Published:2011/7/27 8:43:00 Author:Robert | Keyword: AC-Coupled, Differential, Amplification, Principle

The picture shows the AC-coupled differential amplification principle circuit.   (View)

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MAGNETIC_PHONO_PREAMPLIFIER

Published:2009/7/5 23:53:00 Author:May

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Programmable Gain Buffer Amplification Circuit With Super Use Of Floating Exchange

Published:2011/7/30 19:41:00 Author:Robert | Keyword: Programmable, Gain, Buffer, Amplification, Super, Use, Floating Exchange

The picture shows the programmable gain buffer amplification circuit with super use of floating exchange.   (View)

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LINE_OPERATED_AMPLIFIER

Published:2009/7/5 23:52:00 Author:May

T1 isolates the unit from the line, and has a 24-V, center-tapped secondary. The output of the transformer is rectified by diodes D1 and D2 and filtered by capacitor C3 to provide 15 to 18 Vdc. The LM383 has built-in protection against speaker shorts.   (View)

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1_A_LAMP_FLASHER

Published:2009/7/5 23:52:00 Author:May

National LM195 power transistor is turned on and off once per second for flashing 12-V lamp. Current limiting in LM195 prevents high peak currents during turnon even though cold lamp can draw 8 times normal operating current. Current-limiting feature prolongs lamp life in flashing applications.-R.Dobkin, Fast IC Power Transistor with Thermal Protection, National Semiconductor, Santa Clara, CA, 1974, AN-110, p 5.   (View)

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AUDIO_AMPLIFIER

Published:2009/7/5 23:47:00 Author:May

C9 is necessary to filter-out rf input interferences.R3 in combination with C5 is used to limit the af frequency bandwidth.The 470-μF power supply decoupling capacitor is C10.   (View)

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A Gain-Program-Control Apparatus Amplification Circuit

Published:2011/7/27 3:28:00 Author:Robert | Keyword: Gain, Program, Control, Apparatus, Amplification

The picture shows thea gain-program-control apparatus amplification circuit.   (View)

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MICRO_SIZED_AMPLIFIER

Published:2009/7/5 23:43:00 Author:May

Sound detected by electret microphone MIC1 is fed to IC1's input through resistor R2, and capacitors C1 and C2. Resistors R2 and R5 determine the overall stage gain, while C2 partially determines the amplifier's frequency response. To ensure proper operation, use a single-ended power supply. R3 and R4 simulate a null condition equal to half the power supply's voltage at IC1's noninverting input. The output of IC1 is transferred to emitter-follower amplifier Q1 via volume control R6. The high-Z-in/low-Z-out characteristic of the emitter-follower matches the moderately high-impedance output of IC1 to a low-impedance headphone load.   (View)

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Double_conversion_IF_strip

Published:2009/7/23 22:01:00 Author:Jessie

This circuit shows an SL6700 (Fig. 2-13) connected to form a double-conversion (10.7 MHz and 455 kHz) IF strip, using a ceramic filter for the 455-kHz network. The sensitivity of this circuit is typically 5μV (rms), with 30% modulation for a 10-dB S/N ratio. The circuit will accept up to 100 mV (rms) at 80% modulation with distortion below 5%.   (View)

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POSITIVE_LOGIC_LAMP_DRIVER

Published:2009/7/23 21:54:00 Author:Jessie

Turns on lamp for zero or positive control pulse at A. Negative pulse at B tests condition of circuit and lamp.-A. E. Popodi, Reliable Repertoire Of Display Circuits, Electronics, 38:2, p 60-66.   (View)

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MICROPHONE_AMPLIFIER

Published:2009/7/5 23:14:00 Author:May

This circuit features the ZTX450/ZTX550 transistors in a push-pull output stage. The following read-ings were taken at maximum volume: Input:O.4mVrms Output:l.8Vrms Voltage gain:4500Max. output before distortion: 2.25 V rms- supply current = 3.5 mA Zero output-supply current: 3.5 mAWattage:0.034 WFrequency response: 250 Hz to 28 kH   (View)

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GAIN_CONTROLLED_STEREO_AMPLIFIER

Published:2009/7/5 23:13:00 Author:May

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Floating Signal Source Programmable Gain Amplifier Circuit Composed Of PGA203

Published:2011/7/29 9:10:00 Author:Robert | Keyword: Floating, Signal, Source, Programmable, Gain, Amplifier

The picture shows the floating signal source programmable gain amplifier circuit. This circuit uses digital-control instrumentation amplifier PGA203 integrated chip. Its programmable gain have: 1, 2, 4, 8 (binary). It has low bias current (maximum value is 50pA) and fast setup time (2us can be 0.01%) and low nonlinear distortion (maximum nonlinear distortion is 0.012%) and high CMRR (minimum value is 80dB). The relations between the control ports A0, A1's voltage level and the gain Av is listed in picture 2.   (View)

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