Amplifier Circuit

Common-mode voltage reaches + 1000V Differential amplifier circuit with INA110

Published:2011/8/30 2:48:00 Author:Jessie | Keyword: Common-mode voltage, Differential amplifier

As shown in figure, the circuitis common-mode differential amplifying circuit with the input voltagebeing+ 1000V. This circuit adopts mosfet (FET) input apparatus using amplifierINA110 and input resistance bleeder. Reverse phase input and in-phase input is respectivelycomposedof R1, R2 and R3, R4.Because R1=R3, R2=R4, the attenuation ratio of voltage divider is: K=R2/(R1+R2)=10/(10+990)=1/100.   (View)

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Driver 50 Ω load linear amplifier circuit

Published:2011/8/30 2:45:00 Author:Jessie | Keyword: Driver 50 Ω load, linear amplifier

As shown in the chart, the circuitis the driver 50 Ω load linear amplifier circuit. This circuit consists of two components. The former stage is composedof thechip MC3401 and affiliated circuit, and the laststage is the OTL complementary symmetry power amplifier circuit. R2 is introduced tovoltage parallel negative feedback to improve the dynamic index.   (View)

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Low distortion AGC amplifier (AD824) diagram

Published:2011/8/30 2:31:00 Author:Jessie | Keyword: Low distortion, AGC amplifier

In communications, control and remote sensing system, the low distortion automatic gain control circuit is needed. As shown in diagram, the circuit is the low-distortion AGC amplifier. A1 is the amplifier. A2 is the voltage following device, which is used asisolation level to introduce feedback for amplifier A1. Integrated amp in (A) can be proper selected according to actual needs. If you hope the single power supply, you can choose low powerfour operational amplifiercircuit AD824A or AD824B; If you hope to adopt double power supply, you can use μPC4074 four operational amplifier integrated chip.   (View)

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6z4 Tube amp circuit

Published:2011/8/29 20:56:00 Author:Jessie | Keyword: Tube amp

Voltage amplifier tube canreplace 6N1, thenR4 reduces to100kΩ, R10 reduces to50kΩ. 6Z4 can replace power rectifier electronic diode. Because single 6Z4'smaximumDC output current is only 75mA,it should use two tubes connected in parallel. It also can use semiconductor diode to replace it.   (View)

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Unipolarity isolation test instrumentation amplification circuit composed of ISO100 with detuning adjustment

Published:2011/8/30 1:36:00 Author:Jessie | Keyword: Unipolarity isolation , test instrumentation amplification, detuning adjustment

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The detector amplifier without cooling

Published:2011/11/30 21:35:00 Author:May | Keyword: detector amplifier, without cooling

This circuit is a low-noise amplifier, its input isconnected with ORP10 lndium antimonide detector workingunder room temperature . Four low noise transistors are connected inparallelfor thefirst step in order to match with low noise level photoresistor (30Ω) connected in input end. Effective noise figure is 3dB, voltage gain is 220, bandwidth is above 1MHz.   (View)

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Low noise 8GHz small signal amplifier circuit diagram

Published:2011/11/3 0:47:00 Author:May | Keyword: small signal amplifier, Low noise small signal amplifier, 8GHz small signal amplifier

Low noise 8GHz small signal amplifier circuit diagram is shown in the following diagram: In the circuit, it sets three cavity chambersmade of silvering brass or aluminum. The working frequency range of amplifier is 5.9~6.4MHz.Main technology data of two level amplifer:amplification factor: 18dB±0.5dBReflectivity when input end carrys insulator: ≤0.1output end reflectivity: ≤0.2noise factor:≤3.5dB1dB compression point: +12dBcut off point: +25dBreverse amplification factor: <-50dBharmonic interval: >30dB   (View)

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1000MHz two-level broadband amplifier circuit diagram

Published:2011/10/31 3:54:00 Author:May | Keyword: 1000MHz , two-level broadband amplifier

Wide-band amplifier composed of two BFT65 is packaged in one 50×50mm copper coated board. When noise factor is 0.5dB, the gain is 20dB; when crossover modulation attenuation is60dB, theoutput voltage is 130mV. The first level transistor T1 intergrated current is 8mA, the second level T2 collector current is 20mA. Main technical data: work voltage: UB=12Vwork current: Ib=28mAamplification factor ( when 1~1000MHz, RC=RL=60Ω) : VP>20dBnoise factor ( when 1~1000MHz, RC=RL=60Ω) : F<5dBstanding-wave ratio ( when 1~1000MHz, RC=RL=60Ω) : S<2output voltage ( when f=800MHz, RC=RL=60Ω) : Ua=130mV   (View)

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Cheap solid amplifier circuit diagram

Published:2011/10/27 21:41:00 Author:May | Keyword: solid amplifier

μ voltage amplifying tube 6N1 (1/2) is made in the single-stage self-sufficient bias voltage amplifier with the gain K=20, when it is input 0.6V active voltage, it outputs 12V signal voltage to make the backward stage reach the specified output power 11W, which can definitely satisfy with each kind of sound source connection. The backward stage of power amplifier uses two ６Ｐ１３Ｐ connected in parallel, which is used as the single-end Class A power output, and the loaded impedance is 1300Ω. Because the complete machine's distortion is not very high, therefore it will omit the negative feedback ring circuit to exhibit broad sound field. The 6P13P filament is supplied by AC 6.3V, and the 6N1 filament is supplied by the DC power supply.   (View)

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Medium power linear amplifier pin circuit

Published:2011/11/2 21:02:00 Author:May | Keyword: power linear amplifier

RF2103P is thepower linear amplifier IC, which uses advanced GaAs heterojunction bipolar transistor (HBT), and it is designed for UHF frequency wireless transmit final linear RF amplifier, and its working frequency is 450~1000MHz. RF2103P also can be used as driver amplifier to applyin higher power situation, and the device includes power supply wire, bypass capacitor and matchingnetwork, and itcan generate 750mW (CW) output power. RF2103 can besupplied by 3 batteries, and the maximum CW is 175mW when output is 3.6V, and the device's total gain is 31dB. RF2103P can be used for digital communication system, spread spectrum communication system as high power linear driver. RF2103P pin array is shown in the picture. Pin function is shown in the following diagram:   (View)

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RF amplifier principle circuit composed of RF2103P

Published:2011/10/26 21:11:00 Author:May | Keyword: RF amplifier

RF signal (RF) isinput by pin 1, enlarged by preamplifier and final power amplifier ( FPA), thenoutput by pin 14. There is a blocking coupling capacitor between pin 1 and preamplifier, so it does not need to add coupling capacitor. Output ends pin 8, 9, 13, 14 are connected inside of the chip. Normally, pin 13, 14 are connected outside to be uses the as signal output, which connects to the matching network to make the amplifier output resistance match with it, then it gets themaximum output power and efficiency; and pin 8, 9 are connectedoutsideto beas power supply end, when it works at 915MHz, it adds a filter capacitor C2(=2pF) to ground tomake up filter circuitwith second harmonic, which can shortconnect second harmonic effectively.   (View)

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Medium power amplifier RF2104 pin circuit

Published:2011/10/26 21:27:00 Author:May | Keyword: Medium power amplifier

RF2104 is the medium power amplifier IC, and the design is used in UHF frequency band radio transmitting last stage linear RF enlarging, and the operating frequency is 400~1000MHz. RF2104 can be used as the driver amplifier to apply in the high power situation, and it uses the square bat-flyaway 16-lead seal. RF2104 can be supplied by 3-battery power supply, and the biggest CW output is +27dBm when the power is 3.6V, the component overall gain is 26dB. RF2104 is used in 900MHz ISM frequency band, 400MHz industry radio traffic, high-power driver, portable battery supply set, commercial and the consumer system, base depot equipment and so on.   (View)

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Rongsheng heat insulation automatic electric cooker principle diagram

Published:2011/8/30 1:40:00 Author:Jessie | Keyword: Rongsheng , heat insulation, automatic electric cooker

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830MHz medium power amplifier principle circuit composed of RF2104

Published:2011/10/26 21:36:00 Author:May | Keyword: medium power amplifier principle

Radio-frequency signal (RF) is input by pin 5, output by pin 12 after being amplified by the pre-amplifier, last stage power amplifier. pin 5 has the DC voltage, therefore it is added the separating direct coupling capacitor and simultaneously connected to divergence inductance (10nH) in parallel, pin 5's input impedance is 50Ω. The output end's pin 12, 13 are connected, usually, pin 13, 14 are connected outside to be used as the signal output, and the output connects the matching network to make the amplifier output impedance match with it, when the pin's loaded impedance is 5+10Ω, itmay obtain the peak power output. pin 13, 14 are connected outside to be used as the last stage power amplifier's power source end.   (View)

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RF2126 high power linear amplifier pin circuit diagram

Published:2011/10/26 22:00:00 Author:May | Keyword: high power linear amplifier

RF2126 is high-power, high-efficiency linear amplifier IC. It adopts advanced GaAs hetero-junction bipolar transistor (HBT) technology. It is designed for 2.5GHz ISM frequency range final linear RF amplifier, such as WLAN and POS terminal, it also can beused for digital PCS phone to send out final linear enlarging. Its working frequency is 1800~2500MHz.RF2126 has matching network, and RF2126 itself includes power supply wire and bypass capacitor. Output power’s typical value is 1W. RF2126 can beused for 2.5Hz ISM frequency range, digital communication system, PCS communications system, commercial and consumer system, portable battery power equipment and so on. RF2126’s pin array and functionare shown in the following diagram.   (View)

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Operation amplifiering instrumentation amplifier circuit

Published:2011/8/24 2:13:00 Author:Jessie | Keyword: Operation amplifiering, instrumentation amplifier

Instrumentation amplifier is usedin the occasion whereneed to amplifier small level signalDC signal, andit is produced by minus skulls topology. Instrument amplifierhas the advantage of in-phase input's high impedance. This circuit is the basic instrument amplifier circuit, other instrumentation amplifiers areshown in the figure, here the input also use a single power supply. This circuit is actually a single power strain gauge. This circuit's fault is need completely equal resistance, otherwise this circuit's common mode rejection ratio will be very low.   (View)

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805 single end power amplifier circuit

Published:2011/10/26 22:11:00 Author:May | Keyword: single end, power amplifier

It isthe 805 single end circuit with proper performance. Its debugging is very simple. Push level upraises 805’s cathode potential even though itdoes not add negative voltage supply. And this is equivalent to add push range. The whole adds some loop feedback and it can not cause thetone impaired problem. It needs to take notethat the supply voltage of 805’s filament should bein the range of 10V ±0.2V and the output power is higher than 25W.   (View)

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Samsung KA22471 FM AM intermediate frequency amplifier circuit diagram

Published:2011/8/19 2:24:00 Author:Jessie | Keyword: Samsung, FM AM , intermediate frequency amplifier

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Operation amplifier subtracter circuit diagram

Published:2011/8/19 2:23:00 Author:Jessie | Keyword: Operation amplifier subtracter

Like adder, figure8 is a subtracter. It is used to remove the original singer's voices in stereo cassettes and leave the accompaniment ( When recording, the two channels' originalvoice's levelis the same, but the accompaniment's is not).   (View)

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805 Vacuum tube transformer push power amplifier circuit

Published:2011/5/13 4:49:00 Author:May | Keyword: power amplifier, Vacuum tube, transformer push

The 805’s features of high essential resistance leads to that the inductance value output transformer needed is larger. In addition, the other problem caused by it is that output impedance is too high and damping coefficient is decreased. It is a common 805 circuit without transformer secondary sampling negative feedback. Its damping coefficient is 10K/tube essential resistance (10K)=1 and is lower when output transformer’s primary impedance is 10K. And it is lacking proper controlling force to speaker. Low frequency has lager quantity but low quality. Also, the damping coefficient of 300B vacuum tube with 700Ω essential resistance is 3.5K/700Ω=5 and it has effective controlling force to speaker when it adopts 3.5K output transformer. So, the 805 class essential resistance tube should add negative feedback which the sampling point is output transformer’s primary, and the familiar is negative feedback loop. It can make the essential resistance of 805 decreasing some by suitable decreasing the working voltage (suitable decrease output power) and improving 805 working current (with litter influence the designing and making of output transformer). But it is not the main method.   (View)

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