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Index 9

LM3886 60 Watt Amplifier

Published:2013/4/26 1:19:00 Author:muriel | Keyword: LM3886, 60 Watt, Amplifier

LM3886 60 Watt Amplifier

This is one of the stronger amps. It supports stand-by and mute modes. The schematic is rather complicated, because there are some additional devices in the feedback and there are filters both on the input and on the output. (View)

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The non-inverting amplifier summing inverter circuit diagram

Published:2013/4/11 1:42:00 Author:Ecco | Keyword: non-inverting amplifier, summing inverter

The non-inverting amplifier summing inverter circuit diagram is shown as figure. (View)

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Inverting amplifier circuit diagram using bootstrap circuit

Published:2013/4/11 1:47:00 Author:Ecco | Keyword: Inverting amplifier , bootstrap circuit

Inverting amplifier circuit diagram using bootstrap circuit is shown as figure. (View)

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The inverting amplifier circuit diagram with T- resistor network replacing R2

Published:2013/4/11 1:48:00 Author:Ecco | Keyword: inverting amplifier, T- resistor network, replacing R2

The inverting amplifier circuit diagram with T- resistor network replacing R2 is shown as figure. (View)

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Basic non-inverting amplifier circuit diagram

Published:2013/4/11 1:35:00 Author:Ecco | Keyword: Basic non-inverting amplifier

Basic non-inverting amplifier circuit diagram is shown as figure. (View)

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Non-inverting amplifier noninverting follower circuit diagram

Published:2013/4/11 1:39:00 Author:Ecco | Keyword: Non-inverting amplifier, noninverting follower

Non-inverting amplifier noninverting follower circuit diagram is shown as figure. (View)

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The differential amplifier circuit diagram with adjustable gain

Published:2013/4/11 1:37:00 Author:Ecco | Keyword: differential amplifier , adjustable gain

The differential amplifier circuit diagram with adjustable gain is shown as figure. (View)

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High input impedance differential amplifier circuit diagram

Published:2013/4/11 1:35:00 Author:Ecco | Keyword: High input impedance , differential amplifier

High input impedance differential amplifier circuit diagram is shown as figure. (View)

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Integrated instrumentation amplifier circuit diagram

Published:2013/4/11 1:33:00 Author:Ecco | Keyword: Integrated instrumentation amplifier

Integrated instrumentation amplifier circuit diagram is shown as figure. (View)

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The amplifier circuit with digital circuit

Published:2013/4/6 22:35:00 Author:Ecco | Keyword: amplifier circuit , digital circuit

The amplifier circuit with digital circuit is shown as figure. (View)

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Mini-box 2w Amplifier electronic circuit

Published:2013/4/1 3:21:00 Author:Ecco | Keyword: Mini-box 2w Amplifier

Mini-box 2w Amplifier electronic circuit
This amplifier was designed to be self-contained in a small loudspeaker box. It can be feed by Walkman, Mini-Disc and CD players, computers and similar devices having line or headphone output. Of course, in most cases you'll have to make two boxes to obtain stereo.The circuit was deliberately designed using no ICs and in a rather old-fashioned manner in order to obtain good harmonic distortion behaviour and to avoid hard to find components. The amplifier(s) can be conveniently supplied by a 12V wall plug-in transformer. Closing SW1 a bass-boost is provided but, at the same time, volume control must be increased to compensate for power loss at higher frequencies.In use, R9 should be carefully adjusted to provide minimal audible signal cross-over distortion consistent with minimal measured quiescent current consumption; a good compromise is to set the quiescent current at about 10-15 mA.To measure this current, wire a DC current meter temporarily in series with the collector of Q3. (View)

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Low Impedance Microphone Amplifier electronic circuit diagram

Published:2013/4/1 3:20:00 Author:Ecco | Keyword: Low Impedance, Microphone Amplifier

Low Impedance Microphone Amplifier electronic circuit diagram
The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don't build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this case, you should directly connect the signal to C7. (View)

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Improved 3 Transistor Audio Amp electronic circuit

Published:2013/4/1 3:17:00 Author:Ecco | Keyword: Improved, 3 Transistor , Audio Amp

Improved 3 Transistor Audio Amp electronic circuit
This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is tied directly to the + supply. This has a disadvantage in that as the output moves positive, the drop across the 470 ohm resistor decreases which reduces the base current to the top NPN transistor. Thus the output cannot move all the way to the + supply because there wouldn't be any voltage across the 470 resistor and no base current to the NPN transistor. This circuit corrects the problem somewhat and allows a larger voltage swing and probably more output power, but I don't know how much without doing a lot of testing. The output still won't move more than a couple volts using small transistors since the peak current won't be more than 100mA or so into a 25 ohm load. But it's an improvement over the other circuit above. In this circuit, the 1K load resistor is tied to the speaker so that as the output moves negative, the voltage on the 1K resistor is reduced, which aids in turning off the top NPN transistor. When the output moves positive, the charge on the 470uF capacitor aids in turning on the top NPN transistor. The original circuit in the radio used a 300 ohm resistor where the 2 diodes are shown but I changed the resistor to 2 diodes so the amp would operate on lower voltages with less distortion. The transistors shown 2n3053 and 2n2905 are just parts I used for the other circuit above and could be smaller types. Most any small transistors can be used, but they should be capable of 100mA or more current. A 2N3904 or 2N3906 are probably a little small, but would work at low volume. The 2 diodes generate a fairly constant bias voltage as the battery drains and reduces crossover distortion. But you should take care to insure the idle current is around 10 to 20 milliamps with no signal and the output transistors do not get hot under load. The circuit should work with a regular 8 ohm speaker, but the output power may be somewhat less. To optimize the operation, select a resistor where the 100K is shown to set the output voltage at 1/2 the supply voltage (4.5 volts). This resistor might be anything from 50K to 700K depending on the gain of the transistor used where the 3904 is shown. (View)

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Headphone Amplifier electronic circuit

Published:2013/4/1 3:16:00 Author:Ecco | Keyword: Headphone Amplifier

Headphone Amplifier electronic circuit
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Guitar Amplifier electronic circuit diagram

Published:2013/4/1 3:16:00 Author:Ecco | Keyword: Guitar Amplifier

Guitar Amplifier electronic circuit diagram
The aim of this design is to reproduce a Combo amplifier of the type very common in the 'sixties and the 'seventies of the past century. It is well suited as a guitar amplifier but it will do a good job with any kind of electronic musical instrument or microphone. 5W power output was a common feature of these widespread devices due to the general adoption of a class A single-tube output stage (see the Vox AC-4 model).Furthermore, nowadays we can do without the old-fashioned Vib-Trem feature frequently included in those designs.The present circuit can deliver 10W of output power when driving an 8 Ohm load, or about 18W @ 4 Ohm.It also features a two-FET preamplifier, two inputs with different sensitivity, a treble-cut control and an optional switch allowing overdrive or powerful treble-enhancement.Technical data are quite impressive for so simple a design:Sensitivity: 30mV input for 10W outputFrequency response: 40 to 20KHz -1dBTotal harmonic distortion @ 1KHz and 10KHz, 8 Ohm load: below 0.05% @ 1W, 0.08% @ 3.5W, 0.15% at the onset of clipping (about 10W). (View)

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Ecm Mic Preamplifier electronic circuit

Published:2013/4/1 3:13:00 Author:Ecco | Keyword: Ecm Mic Preamplifier

Ecm Mic Preamplifier electronic circuit
A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components. (View)