Circuit Diagram

4 microphones mixer circuit with TL081

Published:2012/9/10 21:25:00 Author:Ecco | Keyword: 4 microphones

A TL081 op amp is used as a high impedance to low. converter and a signal mixer. The input impedance is about 1 megohm and the output impedance is about 1 kohm. Two 9 volt batteries are used as power source. ..   (View)

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Audio input selector circuit (4416 CMOS)

Published:2012/9/10 21:20:00 Author:Ecco | Keyword: Audio input , selector, CMOS

CMOS switches are used directly to select the entries in the audio circuits, it can introduce unacceptable levels of distortion, but if the switch is included in the feedback network of an op amp, the distortion due to the switch may be virtually eliminated. The circuit uses a CMOS switch 4416, arranged as two independent SPDT switches. If switching transients are unimportant, R5 and C1 can be omitted, and R4 may be short-circuited.   (View)

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4 channel audio mixer with TL074

Published:2012/9/10 21:19:00 Author:Ecco | Keyword: 4 channel , audio mixer

This circuit can be used as a mixer and a stereo track four. The quad op-RNAP IC gives a little gain for each track, the pan control provides panning between one and two tracks with the switch to high, and with the switch to low, it is possible to pan between the tracks and three four channels can be added.   (View)

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Small leakage pre-amplifier

Published:2012/9/10 21:19:00 Author:Ecco | Keyword: Small leakage, pre-amplifier

The circuit uses the LM301 has an input leakage of only 2 pA typical at 75 ° C and is used with 1 M ohm input resistance. The operating voltage has to be +-12V.   (View)

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Low distortion audio gain limiter

Published:2012/9/10 21:18:00 Author:Ecco | Keyword: Low distortion , audio gain , limiter

The level at which the limiter kicks in audio can be adjusted with the selector knob LIMIT LEVEL. When this level is exceeded, the output of the half-LIMITING detector of the op-amp (used as a comparator) turns the LED causes the resistance of the photoresistor to decline rapidly. It is in tum causes the gain of Ie half LIMITED op-amp to decrease.   (View)

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4 microphones mixer circuit with TL081

Published:2012/9/10 21:17:00 Author:Ecco | Keyword: 4 microphones, mixer

A TL081 op amp is used as a high impedance to low. converter and a signal mixer. The input impedance is about 1 megohm and the output impedance is about 1 kohm. Two 9 volt batteries are used as power source.   (View)

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Stereo Preamplifier Circuit (741)

Published:2012/9/10 21:16:00 Author:Ecco | Keyword: Stereo Preamplifier

The circuit works with two 741 opamps and provides better than 20 dB gain in each channel. A better type op-amp will give a better noise figure and bandwidth. In this circuit, the sharp roll-off is at 20,000 Hertz.   (View)

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RIAA preamplifier CA3410

Published:2012/9/10 21:15:00 Author:Ecco | Keyword: RIAA preamplifier

This circuit has read the RIAA equalization, tone controls, and adequate gain to drive most power amplifiers conunercial by using CA3410 op amp BiMOS. Total harmonic distortion, pushed to provide an output of 6-V, is less than 0.035% in audio-frequency range from 150 Hz to 40 kHz. Full stereo preamp is to duplicate this circuit using the CA3410 remaining two amplifiers. Source: discovercircuits   (View)

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Microphone preamplifier with TLC251

Published:2012/9/10 21:15:00 Author:Ecco | Keyword: Microphone preamplifier

A microphone preamplifier using: om CMOS op amp with its own battery, is small enough to be placed in a case of small microphone. The amplifier operates from a 1.5V battery cathode mercury low supply currents. This preamp will operate at very low power and maintain a reasonable frequency response as well. The TLC251 is operating in low bias (operating at 1.5 V) draws a supply current of only 10 and has a year - frequency response of 3 dB 27 Hz to 4.8 kHz. With 8-pin grounded, which is designated as the polarization state high limit increases above 25 kHz. Supply current is only - 30 pA under these conditions.   (View)

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Fully adjustable preamplifier

Published:2012/9/10 21:15:00 Author:Ecco | Keyword: Fully adjustable, preamplifier

This circuit is a audio preamplifier tha has balance, tone and loudness controls. It should be suitable as an example of good design for audio application. Uses the BAA730 and NE540 chips.   (View)

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555 Audio Oscillator

Published:2012/9/10 21:14:00 Author:Ecco | Keyword: 555 , Audio , Oscillator

A oscilloscope would be useful in analyzing the waveforms produced by this circuit, but it is not essential. An audio detector is a very useful piece of test equipment for this experiment, especially if you don't have an oscilloscope. Source: discovercircuits   (View)

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8 Watts Audio Amplifier (TDA2003)

Published:2012/9/10 21:14:00 Author:Ecco | Keyword: 8 Watts, Audio Amplifier

Nice small audio amplifier which use only few parts to give good quality sound. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. Although not perfect, this amplifier does have a wide frequency response, low harmonic distortion about 1.5%, and is capable of driving an 8 ohm speaker to output levels of around 8 watts with slightly higher distortion. Source: discovercircuits   (View)

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Low Power Amplifier LM386

Published:2012/9/10 21:13:00 Author:Ecco | Keyword: Low Power , Amplifier

A power amp designed for use in low voltage, especially battery-operated, applications. For minimum parts count, C1 and C2 can be omitted. Source: discovercircuits   (View)

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1W stereo Headphone Amp (TDA2822)

Published:2012/9/10 21:13:00 Author:Ecco | Keyword: 1W , stereo , Headphone Amp

A stereo power amp designed for use in portable players and radios. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel. Source: discovercircuits   (View)

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Bomb Proof 150 Watt MOSFET Power Amplifier

Published:2012/9/10 21:12:00 Author:Ecco | Keyword: Bomb Proof , 150 Watt , MOSFET , Power Amplifier

In my opinion that is the best buildable high power amplifier out there. Quality of sound is just remarkable. This is a real bomb proof amplifier like the best Valve amps. Power supply circuit is also shown. Now lets see why we are going to use MOSFETS. Thermally, the MOSFET has an advantage over the bi-polar transistor. As a bi-polar transistor heats up in use, the collector current increases due to the positive temperature coefficient of the device. If the temperature rise were allowed to continue then thermal runaway would ensue and the transistor could be destroyed. A MOSFET however exhibits a negative temperature coefficient. As the device heats up in use the Drain-Source current decreases (due to increasing internal resistance), the device temperature will also reduce in turn and the Drain-Source current will then rise again. Source: discovercircuits   (View)

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Gain buffer circuit

Published:2012/9/10 21:12:00 Author:Ecco | Keyword: Gain buffer

The difference between these amplified signals is used to set the 's bias and hence Ql Q2 current channel. This Ql forces of V GS at all that is required voltage corresponding to the circuit input and potential output. The capacitor of 2000 pF to Al provides stable loop compensation. The RC network at the output of Amnesty International that it obscures the edges at high speed coupled through Q2 's base-collector junction. A2 exit from the east also returned to the screen around Ql cause the door, the boot capacity of the circuit comes into force unless I pF. Source: discovercircuits   (View)

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Stabilised amplifier schematic

Published:2012/9/10 21:11:00 Author:Ecco | Keyword: Stabilised amplifier

This is a ideal stabilised amplifier. It use the LT1052 and LT1028. Power supply should be double with +-15V 500mA. Source: discovercircuits   (View)

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Fet amplifier with NPD8301

Published:2012/9/10 21:11:00 Author:Ecco | Keyword: Fet amplifier

The monolithic double NPD8301 offers an ideal low offset buffer function LM10lA low drift op amp. The excellent characteristics for the track NPD8301 over its range of bias current, thereby improving common mode rejection. Source: discovercircuits   (View)

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Auto gain control op-amp circuit

Published:2012/9/10 21:06:00 Author:Ecco | Keyword: Auto gain control, op-amp

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. Source: discovercircuits   (View)

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Thermocouple Amplifier circuit (CA3193)

Published:2012/9/10 21:06:00 Author:Ecco | Keyword: Thermocouple Amplifier

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. Thermocouple Amplifier circuit (CA3193)   (View)

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