An amplifier with gain controlled by frequency(LTC1043)

Published:2011/9/8 6:35:00 Author:Felicity | Keyword: amplifier, gain controlled by frequency

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A isolation amplifier composed of ISO122 with programmable gain

Published:2011/9/8 6:30:00 Author:Felicity | Keyword: isolation amplifier, programmable gain

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Deep-current negative feedback differential motion amplifier diagram

Published:2011/9/7 4:19:00 Author:Vicky | Keyword: deep-current, negative feedback, differential motion amplifier

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100KHz –100 MHz Noise Elimination Circuit Diagram

Published:2011/9/6 21:18:00 Author:Vicky | Keyword: noise elimination circuit

Noise elimination circuit can be designed in the 100kHz～l00MHz superhigh circuit. It is mainly composed by squelch amplifier AL, control circuit VTl～VT3, relay KNf, and regulated voltage supply A2. The working principle is shown in the above picture. When there is no signal received, the output noise voltage of superhigh frequency is lower than 100MV; the DC voltage of detection wave is very small after being filtered by diode VD1 and capacitances C1 and C2. The voltage enters the integrated amplifier A1via pin ② in the output end , and leaves via @. The voltage remains very small after amplified and cannot drive the triode VT1 to work. VT2 stops working and VT3 is under conducted. Relay KM then works.   (View)

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The edge detection circuit using NAND gate

Published:2011/8/8 0:17:00 Author:Sophia | Keyword: edge detection circuit, NAND gate

This circuit is the rising edge detection circuit using the NAND gate previously described, and circuit edge of the output pulse amplitude as T ≈ RC, IC threshold voltage CMOS, T ≈ 0.7RC. In this circuit, when the input is L , the terminal voltage charge of capacitor C is voltage yDD and becomes high level H . When the input is H , before the C terminal voltage reaches y (T = RC), the output level is L . The figure is the input and output waveform of the edge detection circuit. 10pμs negative pulse will be got since the input begins to rise.   (View)

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CMOS operational amplifier drive circuit

Published:2011/8/31 2:17:00 Author:John | Keyword: CMOS operational amplifier

Figure shows the CMOS operational amplifier drive circuit. As the output current of CMOS operational amplifier is generally small, a few blocks of CMOS operational amplifiers should be set in parallel for driving the LED, as shown in Figure (a) and Figure (b). Sometimes, a CMOS operational amplifier transistor can be added to extend the drive current, as shown in Figure (c). In the circuit shown in Figure (d), once driven, CMOS operational amplifier’s output voltage can be incurred by LED clamp around the UF.   (View)

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The gain programmable instrument amplifier composed of INA102

Published:2011/8/13 3:11:00 Author:qqtang | Keyword: gain, programmable, instrument amplifier

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The instrument amplifier of removing AC sound (INA101)

Published:2011/8/13 3:09:00 Author:qqtang | Keyword: instrument amplifier, AC sound

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The gain programmable high speed instrument amplifier composed (PGA102 and OPA602)

Published:2011/8/13 3:14:00 Author:qqtang | Keyword: gain, programmable, high speed, instrument amplifier

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The precise separating instrument amplifier (INA102)

Published:2011/8/13 3:16:00 Author:qqtang | Keyword: precise, instrument amplifier

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Lm1875T Hi-Fi 30w audio power amplifier circuit diagram 1

Published:2011/8/19 1:10:00 Author:Jessie | Keyword: Hi-Fi , 30w , audio power amplifier

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Lm1875T Hi-Fi 30w audio power amplifier circuit diagram 2

Published:2011/8/19 0:58:00 Author:Jessie | Keyword: Hi-Fi , 30w audio, power amplifier

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Lm1875T Hi-Fi 30w audio power amplifier circuit diagram 3

Published:2011/8/19 0:59:00 Author:Jessie | Keyword: Hi-Fi , 30w , audio power amplifier

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The OTL power amplifier circuit made of TDA2030A

Published:2011/8/23 22:11:00 Author:Borg | Keyword: power amplifier, OTL

The OTL power amplifier is powered by a single supply and it is fixed with an output coupling capacitor. See as the figure, R5 (150 kΩ) and R4 (4.7 kΩ) decide the gain of the amplifier closed loop, the lower the resistance of R4 is, the higher the gain will be, but high gain can lead to the distortion of the signal. The 2 LEDs are connected between the power supply and the output terminal, which is used to prevent the inverting of the loudspeaker inductance load from affecting the sound quality, C3(0.22 uF) and R6(1 Ω) are used to compensate the phase of the inducting load (loudspeaker), so the self-motivation is gone, the circuit is powered by a 36V single power supply.   (View)

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The OTL power amplifier circuit composed of TDA2030A

Published:2011/8/23 22:11:00 Author:Borg | Keyword: power amplifier, OTL

The OCL power amplifier type is to use dual power supply without any coupling capacitor, see as the figure, as there is no output coupling capacitor, the low frequency reaction is improved, so it is a hi-fi circuit. The dual power supply is fixed with a transformer whose primary coil middle point is connected with the ground and the voltages of the upper and lower are symmetric, after being rectified and filtered, a ±18V dual power supply is formed, whose output power is 20W.   (View)

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The BTL power amplifier circuit made of TDA2030A

Published:2011/8/23 22:12:00 Author:Borg | Keyword: BTL, power amplifier

The main features of BTL are as follows: it consists of 2 power amplifiers of the same functions, and the input signals are inverting. In fact, both the inverting input and non-inverting input are used to make sure the input signals are inverting, at the same time, their amplitudes are the same, so the requirement of BTL circuit can be satisfied. The circuit is shown in the figure, after R7(1 kΩ) and R8(33 Ω) distribute the signal, the attenuating times are equal to the amplified times of U1, and the attenuated signal is added on the inverting terminal of U2 by R5.   (View)

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The single power supply amplifier circuit with a bootstrap circuit

Published:2011/8/23 22:12:00 Author:Borg | Keyword: single power supply, amplifier, bootstrap circuit

The single power supply amplifier circuit with a bootstrap circuit is shown in the figure.   (View)

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The voltage amplifier circuit of the electric charge amplifier

Published:2011/8/23 22:13:00 Author:Borg | Keyword: voltage amplifier, electric charge amplifier

The voltage amplifier circuit of the electric charge amplifier The feature of the the electric charge amplifier is the wide frequency band. In the backward feedback circuit, as the distributing circuit determines the gain, the signal is stabilized by the cable capacitor output by the sensor. This amplifier consists of the high gain op-amp and backward feedback capacitor, and the lower limit frequency is decided by C1 and R1.   (View)

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The thermocouple isolated amplifier circuit

Published:2011/8/23 22:13:00 Author:Borg | Keyword: thermocouple, isolated amplifier

Working principles: Q1 is the pre-amplifier tube, which is using the NPN silicon tube, its temperature stability is good. To reduce the noise, the front stage is the key, or the noise will be noticeable after it is amplified at the following stages. The most importance is to avoid the noise being input from the base electrode. In this circuit, the base electrode power supply of Q1 is got after it is stabilized by D1 and D2, which improves the stability further. The resistance of the emitter resistor R4, which has little effect on the stable and still working point, it fulfills the function of AC backward feedback.   (View)

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The voltage amplifier circuit of the piezoelectric accelerator

Published:2011/8/23 22:13:00 Author:Borg | Keyword: voltage amplifier, piezoelectric accelerator

The voltage amplifier circuit of the piezoelectric accelerator The voltage amplifier is an amplifier circuit with a high input impedance, as the capacitance change of the sensor output cable will make the output voltage change with it, so R is often used in the piezoelectric accelerating sensor with an amplifier inside it.   (View)

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