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Crossed from: Inside Circuits | Clicks: 14512 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 2
Dual supply for audio amplifiers
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Most amps acoustic frequencies that make our readers, instead of a transformer power, sometimes required two or sometimes three. This tactic is more common in amplifiers 'High-End', where the altar of high fidelity are all eager to sacrifice their economies. In these cases the primary, all connected to the network of 220V, paralleled each other yet, through a single security, the nearest outlet. The problem that arises in such a connection is related with as such security. If the amplifier has two transformers, then the defendant one of them leads by one channel (or more generally a set of circuits), and if available, and a third, he'll have as sole purpose supplying circuit protection and control of others...
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Crossed from: Inside Circuits | Clicks: 13666 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
High input impedance amplifier CA3440
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This circuit takes advantage of the leakage of low power, high input impedance, frequency and capacity of the excellent CA3440. Only one input coupling capacitor of 500 pF is needed to achieve a 20 Hz, -3 dB low frequency response.
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Crossed from: Inside Circuits | Clicks: 3859 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Amplifier Compressor MC3340P
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This audio compressor circuit use a MC3340P as a variable gain amplifier. The output is rectified and TR2 controls the gain of the ICL
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Crossed from: Inside Circuits | Clicks: 8117 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
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Crossed from: Inside Circuits | Clicks: 10299 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 3
Audio splitter amplifier circuit with TL084
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The three-channel amplifier output distribution uses a single TL084. The first step is to capacitive coupling with a p. 1.0 ~ electrolytic capacitor. The entries are railways Vee Y2 or 4.5 V. This allows using a single 9 V power supply A voltage gain of 10 (1 M ohm ohm/l00 k) is obtained in the first stage, and the other three floors are connected as a unity gain voltage followers. Each output stage drives independently via an amplifier output 50 pF capacitor to the resistance of 5.1 k ohm load.
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Crossed from: Inside Circuits | Clicks: 10222 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 4
Input pulse width controller circuit
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The quad operational amplifier circuit yields full 0 to 100 percent pulse width control. The controller uses an LM3900 requires only a single supply voltage of 4-30 V. The pulse repetition frequency is set by a 1 kHz oscillator amplifier that integrates AI. The oscillator feeds the Az ramp generator, which generates a linear ramp voltage for each pulse oscillator. The ramp signal feeds the inverting input of comparator A3, the control voltage feeds speed non-inverting input. Thus, the output of the comparator is a 1 kHz pulse train, pulse width that changes linearly with control voltage. ..
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Crossed from: Inside Circuits | Clicks: 15575 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Simple differential amplifier circuit
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Operational amplifiers Al and A2 are connected in a noninverting configuration of their training sorties amplifier A3. The operational amplifier A3-one could call a subtractor circuit that converts the differential signal between the floating point X and Y in a single ended output voltage . Although not mandatory, amplifier A3 is usually used in unity gain and R4, R5, R6, and R7 are all equal. Joining-rejection of the amplifier A3 is a function of how the rate of R4: R5 R6 is the ratio: R7. For example, when using resistors with a tolerance of 0.1%, common mode rejection exceeds 60 dB. further improvement can be achieved by using a potentiometer (slightly higher than the value of R6) to R7. ..
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Crossed from: Inside Circuits | Clicks: 9863 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Attenuator circuit
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A op amp and transistors Q1 and Q2 exponential converter to generate an exponential gain control current, which is introduced into the rectifier. A reference current of 150 pA, (15 V and RZO = lOO-k), is attenuated by a factor of two (6 dB) for each increase of tension in the control voltage. Capacitor C6 slows secure changes to a period of 20 IDS constant (C6 x IR) such that a sudden change in the control voltage will produce a gain change smooth sound. RI8 ensures that for control voltages of the circuit will go to great attentuation full. ..
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Crossed from: Inside Circuits | Clicks: 4597 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Auto gain control op-amp circuit
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An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negative voltage doubler / rectifier circuit composed of diodes CRI and CR2, with the capacitor C1. The resulting negative voltage is used as a control voltage which is applied to the door] 2N5485 FET Q1. Capacitor C2 and resistor R2 form a filter for smoothing the voltage rectified audio control. The lFET is connected between pin 2 of the MC3340P grounded by a resistor of 1 kohm....
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Crossed from: Inside Circuits | Clicks: 4144 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Thermocouple Amplifier circuit (CA3193)
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The circuit needs 15 volts and uses a precision op amp CA3193 BiMOS to amplify the signal generated more than 500 times. Three 22-megohm resistors provide large-scale output if the thermocouple opens.
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Crossed from: Inside Circuits | Clicks: 10108 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
2 to 4 wire audio converter
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This audio converter circuit maintains 40 dB of isolation between the two halves of entry and exit of a four-line son, while allowing a line connecting two son. A balancing potentiometer, R, adjusts the gain of zero lC2to crossing the inlet to the outlet. ..
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Crossed from: Inside Circuits | Clicks: 5813 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
HiFi expandor with De-emphasis
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it can reduce its gain. The time it takes for the compressor to recover from overload is determined by the rectifier The expander eg capacitor to complete the compressor is shown in FIG. 2-13B. Here is an external op amp is used for the high rate of ascent. The compressor and expander have unity gain at 0 dB. Trim networks are shown for distortion (THD) and DC offset.
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Crossed from: Inside Circuits | Clicks: 4072 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
High fidelity amplifier circuit
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This circuit for a compressor uses a high-fidelity external op amp, and a high gain and wide bandwidth. A compensation network input is necessary for stability. The rectifier capacitor (Cg) is not grounded. but it is linked to the output of an op amp circuit.
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Crossed from: Inside Circuits | Clicks: 7098 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Small current amplifier circuit
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To amplify the small current signals as an electron collector inside a vacuum chamber, it is convenient for reasons of noise and bandwidth to have a "head-amplifier" attached to the chamber. Op N-amp 1 is a precision device with bipolar bias current and low offset voltage (1)-and the noise low, which allows the 100:1 attenuator comments to be used....
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Crossed from: Inside Circuits | Clicks: 11514 | Votes: 1 | Comments: 0 | Rating: 5 | Rank: 2
GaAsFET amplifier circuit
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The control circuit operates to double from a positive supply, which, when turned on the power of the first door. and goes off when the first drain as shown in FIG. This circuit integrates the LM123, a three-terminal positive regulator and a dc dc + converter, whose output power drains and gates of GaAsFET-power relay in a power amplifier. The controller output drives a three-terminal DC + DC converter - which exit through an N-channel lFET properly so as to pull the base of the series pass transistor 2N6107 at a level to turn it on.
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