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Old 20th December 2012, 12:50 PM   #1
luis d is offline luis d  Colombia
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Default your input on this amplifier circui(su opinión respecto a este circuito amplificador)

A friend recommended this circuit. was tested and simulated (proteus 7) but does not work in the simulation. help me to modify to get more probecho sizes. has a good sound.

excuse my bad English

un amigo me recomendo este circuito. fue probado y simulado (proteus 7) pero en la simulacion no funciona. me ayudan a modificar de talles para sacarle mas probecho. tiene un buen sonido.
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Old 20th December 2012, 05:06 PM   #2
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I think you should add some emitter resistors to Q1,Q2,Q3 and Q4

Q3 and Q4 might not be needed at all If you reduce the value of the feedback resistor and connect it directly to midpoint of emitter resistor of Q1 and Q2.

You should also consider to reduce gain in VAS stage, unless you like the sound of amps with huge amount of negative global feedback.

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Old 20th December 2012, 07:10 PM   #3
sregor is offline sregor  United States
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Something is not right in input. I believe q1 and q3 should be npn and their emitters should be connected to R5 and not q2 and q4. Q4 and q2 emitters should be connected to r4, and r4 and r5 should not be connected. Looks similar to leach amp input stage, or other similar symmetrical designs. Emitter resitors on the input stage improves linearity, but should work with or without.
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Old 20th December 2012, 07:39 PM   #4
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Hi Steve,

Your are right Q1 and Q3 shall be NPN. I totally missed that...Dooough :-)

I still think that Q1,2 could share the node of R4 and R5 with Q3,4.
Feedback would still work this way. But he could omit Q3,4 and just chose a smaller Rf resistor.
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Old 20th December 2012, 09:13 PM   #5
sregor is offline sregor  United States
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If the bases and emitters are tied together, the transistor won't be biased on. Emitters on q1 and q3 have to be -.6 volts below base, and q2 and q4 have to be +.6 volts. And if you are going to eliminate one pair of inputs, then have to convert voltage gain stage on that side to current source or boot strap circuit.
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Old 20th December 2012, 11:17 PM   #6
JMFahey is offline JMFahey  Argentina
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Agree and add.
For that and other errors , I suggest you start by building a classic, well known amp, while you continue studying at your own pace.
The simulation did not lie to you, it showed it does not work.
Sorry.

Nota: pasa tu texto por un corrector gramatical *antes* de traducir.
El traductor no sabe qué quisiste decir porque busca en su diccionario interno.
Por ejemplo, no tradujo "probecho" porque no la encontró, y es lógico, se escribe "provecho".
Suerte.
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Old 21st December 2012, 02:38 AM   #7
luis d is offline luis d  Colombia
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Thanks friends ...
The feedback resistor of the high is because these amplifiers are commonly used by people who like more noise. Today you install this amp in stereo, which had damaged the amplifier, with good results.
A point in favor of this amplifier is temperature in low output transistors.
This pattern was interpreted photocopying a plane that is used in the workshop. The transistors shown in proteus are not actually used the originals.
TN2905A = A733
TIP42 = MJE15031
TIP41 = MJE15030
TIP3055 = 2SC5200
TIP2955 = 2SA1943
This I did for the lack of proteus library.
Tomorrow montare photos PBC (misinterpretation??), Where I extracted the schema and photos mounted amplifier.

Gracias por el consejo JMFahey lo que pasa es que escribí un poco apresurado por el trabajo…
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Old 21st December 2012, 02:46 AM   #8
luis d is offline luis d  Colombia
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This is the circuit that I extracted from Proteus PCB.
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File Type: jpg IMG0465A.jpg (94.2 KB, 143 views)
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Old 21st December 2012, 02:53 AM   #9
AJT is offline AJT  Philippines
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the input ltp's tails should be biased separately.....the drawing is wrong...
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Old 22nd December 2012, 02:32 AM   #10
luis d is offline luis d  Colombia
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Hello everyone thanks for contribution ....
Diagram corrected (amp.pdf)
Perform a misunderstanding and I apologize for that. The images (IMG0469A, IMG0470A,) shows the schematic used as a reference for building and PCB.
SREGOR:'re right Q1 and Q3 are NPN. The schematic is not very clear (IMG0470A) ... I'll take into account your notes ...
Propose improvements that would be a multiplier Vbias (eg Vbias1, vbias2 apex) with limitations.
Note: This amplifier circuit is working on a Mini Hi-Fi Music System (IMG0471A, IMG0472A), with excellent results.
Attached Images
File Type: jpg IMG0466A.jpg (60.5 KB, 110 views)
File Type: jpg IMG0469A.jpg (85.0 KB, 104 views)
File Type: jpg IMG0470A.jpg (97.0 KB, 102 views)
File Type: jpg IMG0471A.jpg (103.6 KB, 100 views)
File Type: jpg IMG0472A.jpg (81.5 KB, 25 views)
File Type: jpg IMG0473A.jpg (84.0 KB, 45 views)
File Type: jpg IMG0468A.jpg (85.4 KB, 44 views)
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File Type: pdf amp.pdf (40.6 KB, 29 views)
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