SOAP MKIII (Simple OpAmp Pre) With onboard PSU - Page 11 - diyAudio
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Old 21st November 2008, 08:46 PM   #101
Puffin is offline Puffin  United Kingdom
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Managed to massage the board into an existing remote controlled pre-amp built some years ago.


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Old 21st November 2008, 10:52 PM   #102
zei is offline zei  Sweden
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Massage mmm

Looks great!

/JZ
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Old 22nd November 2008, 05:24 PM   #103
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Originally posted by zei
Massage mmm

Looks great!

/JZ

zei,

can i use a 16V tranny and regulate it to 15V using on board regulator?
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Old 23rd November 2008, 05:36 AM   #104
zei is offline zei  Sweden
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Yes you can

/JZ
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Old 23rd November 2008, 07:42 AM   #105
Puffin is offline Puffin  United Kingdom
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Zei. You reccommend 15v for the ppower supply. The NE5532 for instance takes a max voltage (I think) of 16v. I am under the impression that an op-amp will run with say 5v? If this is right what benefit is there from running them at higher voltages?
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Old 23rd November 2008, 08:10 AM   #106
zei is offline zei  Sweden
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I,m not shure what (if any) benefits there would be running an OpAmp at lower voltage (Within the recommended range of course)

Most of the times all this info is in the datascheet but i think that the only reason that they can take a range of different voltages is that it increases the numbers of applications they can be used in.

If i remember correctly the E5532 max voltage is +-22V
Opa2134 has a max V of -+18V


lets hope someone else has something more intteresting to say about this

I say +- 15V because it is a number No other reason

/JZ
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Old 23rd November 2008, 08:18 AM   #107
Puffin is offline Puffin  United Kingdom
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The reason I ask is that I used parts I had to build the soap. One of the variable resistors will only give me 10v max. However there is no volume in-balance.
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Old 30th November 2008, 07:20 PM   #108
Puffin is offline Puffin  United Kingdom
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Quote:
Originally posted by Puffin
The reason I ask is that I used parts I had to build the soap. One of the variable resistors will only give me 10v max. However there is no volume in-balance.
BUMP

I would also ask if this Pre has any DC on it? I am getting a bit of cone extension on power-up
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Old 30th November 2008, 07:38 PM   #109
zei is offline zei  Sweden
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You power the preamp after the poweramp is powered?

If powered before thrn i have not had this issue.. and none else that i heard of.

Are you using caps on the output?

/&JZ
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Old 30th November 2008, 08:23 PM   #110
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I have never had a problem with this, but it may have something to do with your sensitive speakers, or an inferior build
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