SOAP MKIII (Simple OpAmp Pre) With onboard PSU

[Puffin]

Zei. Yes, but not in the way you mean!

I have lots of other things to finish before I lather the SOAP

 

[Tripmaster]

Zei. Yes, but not in the way you mean!

I have lots of other things to finish before I lather the SOAP

Boy do you need HELP!

 

[Puffin]

If that's your lunch. then the dinners in the dog!

 

[Tripmaster]

Chips with everything!

 

[zei]

Looks nice and clean Richard

/JZ

 

[Tripmaster]

Looks nice and clean Richard

/JZ

That will be the SOAP!

 

[Puffin]

Well I managed to scavenge enough bits from what I had got to put this together. Just the power supply to go. I am going to use a bridge rectifier for now. I have a 12.6v centre tapped tranny, will that be enought to drive it?

 

[AndrewT]

Hi,
if that 12.6Vac is the loaded voltage, not the open circuit voltage, then you can get a regulated +-12Vdc from it. But, you need +ve & -ve regulators when you use a centre tapped transformer.

 

[Puffin]

AndrewT. The +ve and -ve regs are on the board. I'll give it a go.

 

[Tripmaster]

I have just switched from my Arcam Alpha 7 to my Shigaclone transport and the sound has taken a noticeable leap forward.
The texture and detail is really quite impressive.

 

[Ted205]

has anyone tried the LM4562 in this circuit?

 

[Tripmaster]

has anyone tried the LM4562 in this circuit?

No, but I do have one

 

[Tripmaster]

has anyone tried the LM4562 in this circuit?

I have just popped it in. I will listen to a few tracks and let you know

 

[korben69]

Nothing to modify if using LM4562 ?

 

[Tripmaster]

Nothing to modify if using LM4562 ?

I checked the data sheet before inserting the chip and it appeared to be of a similar spec. I am not sure if the circuit has been optimised for the opa. Any ideas?

In the short time I've had it running I think it sounds a little bit crisper... slightly more detailed.

I will now swap back to the OPA to confirm this...back in a mo

Richard

 

[AndrewT]

stick an oscilloscope on it.
see if there is overshoot at the output, or worse still ringing.
Check for ringing on the supply lines/pins

 

[Tripmaster]

stick an oscilloscope on it.
see if there is overshoot at the output, or worse still ringing.
Check for ringing on the supply lines/pins

Thanks Andrew

I dont have a scope

 

[Tripmaster]

From what I can hear...it doesn't sound any worse

Andrew do you have any recommendations based upon the BOM I previously posted?

I have a OPA2132PA Dual FET op-amp, do you think this is worth trying?

Thanks

Richard

 

[Scribble]

Received my boards today, thanks!

 

[zei]

Great Scribble.
It seems to take forever to reach some parts of our small world.



/JZ