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Old 15th November 2010, 09:31 AM   #11
bmoraru is offline bmoraru  Romania
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Default Schematic with NE5532

So here's the schematic - would LM4562 work ok in this circuit? would very much like to get it right from the first attempl, since devices are SMD-type and i don't believe i can do much de-soldering / re-soldering without damaging the pcb...
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Old 15th November 2010, 11:05 AM   #12
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If you like you must excange all the opamps. Put the JFET's opamps. OPA2134 it is an ideal for you in that configuration. You don't need to modify the power supply, it is possible to be stable without another caps. In that schematic, you have a lot of series resistance , like 820 ohm, and that will rise up the source impedance. It is not good for the input signal currents of the BJT's opamps like 5532's. So, you can exchance it with OPA2134 wich has a huge input impedance. Don't put there a too fast opamp, one with slew-rate of 20V/us it is perfect.
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Old 15th November 2010, 11:32 AM   #13
Mooly is offline Mooly  United Kingdom
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How to work on smd without special tools,
Working with SMD. How to do it without specialised tools.

The LM4562 would work perfectly, so to the OPA2604, both of which are available in SMD. The 2604 remains a personal favourite for me.

Also read post #9 here.
Marantz SA8001 Modification to Eliminate Distortion

Replacing of the mute transistors with FET's is something you might consider. These are TR108 and TR109. You can run the player with these disconnected too, to see if you can detect any difference.
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Old 16th November 2010, 01:23 PM   #14
bmoraru is offline bmoraru  Romania
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Thanks a lot for the information, Mooly!!
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Old 26th January 2011, 03:45 AM   #15
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Default HELLLPPPPPP

OK I'LL TRY TO POST SCHEMS..
I'M HAVING TO CHANGE SOME INPUT AND FEEDBACK RESISTORS( VENDOR SPEC ECO CHANGE) and I need to get gain structure more in line with preamp.

I need help in 2 areas.. which SMD resistor to buy and ne5532 and tlo74 replacements

1) Resistor SMD work is no problem but there are many type SMD resistors..which ones are the "best" and How do I know between types which one to get esp for signal path resistors.

2) Ne5532 and tl074 are going(i have to cut 2 out to get to other stuff on the board and I'm not going to try to unsolder a $2 chip and wreck a board.

I was thinking 2134 for TL and 4652 for the 5532 or just throw in all 2134?

it seems I would need to decouple the 4562 with some caps but I like the specs on that booger! I can't find much info on sound but it is the main line drive for the amp. I need sumin good here.. 627 on browndog?? thanks I seen more info here than I been able to find elsewhere Digikey and Mouser r my friends!
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File Type: pdf crossover board.PDF (46.7 KB, 38 views)
File Type: pdf input board.PDF (43.9 KB, 29 views)
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Old 26th January 2011, 06:23 AM   #16
Mooly is offline Mooly  United Kingdom
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I don't think you will find any difference between SMD resistors as used here... get what fits.

As to the opamps, as you know it's a very personal thing. I love the sound of the OPA604 and 2604.
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Old 26th January 2011, 10:18 AM   #17
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by IMSTOOPID View Post
I was thinking 2134 for TL and 4652 for the 5532 or just throw in all 2134?
no !
don't throw anything in.

Each opamp has a job and a particular specification chosen to suit that purpose. The circuitry around each opamp should have been implemented such that the opamp had a good chance of performing well.

You must consider each opamp and what parameters/characteristics are needed to get that particular opamp to do it's job effectively. Then you must consider what circuitry is needed around that opamp to get adequate performance from it.

After you have done this for all 3 opamps, you may find that different opamps should be used for each stage. Problem !!! how can a dual smd opamp be replaced with a pair of single smd opamps?
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Old 26th January 2011, 01:30 PM   #18
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Default CLARIFICATION gearhead needs sparky

OOPS.LET ME CLARIFY.. OK I KNOW JFET/BIPOLAR SINGLE AND DUAL..
I'm a gearhead(BSME) and know which end of a solderingis hot. Take a look and maybe help me out. Let me post the updates..... resistors 247,245,271,269 get changed form 4.75K to 4.22K.(not sure why) There is a problem with R240 and R239. I don't know how to do opamp gain calcs but these resistors switch in for balanced/ unbalanced connection and it leaves a gain hole hole in the gain structure< right where my preamp puts out>, so I need to change those also. Since (1) 5532 and (1) Tl074 in the crossover section had to be yanked, to get to some other stuff. I was just going to replace them with something "better" if it would work electrically without too much work. Hence the need for a sparky. I was told that the circuit would support 2132 and 2134 as just a drop in. I think it supplies +-15V for the opamps and I have about 1A to drive them (according to manufacturer). You can replace duals with a browndog SIOP8 single/dual adapter, but the 627 requires bypass caps(from what I have read) and I think the 4562 would too, but have not clue how to figure that out, or where to put them. I know the 4562 looks great on paper like a 5532 on steroids. I do know from reading self, jung, curls and other that noise, slew rate and settling time are big factors in spec sheet performance. that's why I was curious about the 4562. decent slew rate, super low noise, and very fast settling time. Now who knows what it will sound like(omg lets not get into that again) Thanks ya'll for taking the time to read my ramblings.
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