Mpp - Page 589

hesener · 22nd May 2012, 11:42 AM

So thats 24dB. This opamp even comes in a dual version, so only 7 components needed (opamp, two resistors, 4 blocking caps) - cute!

what would we need to do to the Paradise to reduce the gain accordignly, without changing the RIAA time constants?

Joachim Gerhard · 22nd May 2012, 12:19 PM

I even DC coupled, or do the "blocking caps" be "decoupling caps"?
I would not put a Paradise behind it, rather a shunt feedback RIAA, also with Opamps.
This is Heresy anyway, Opamps in the MPP thread !
One could change the RIAA components in the Paradise for higher value caps and lower value resistors but there is a boundary on how much current the mirrors can drive.

hesener · 22nd May 2012, 02:29 PM

Here is how I implemented the emitter caps in the paradise R1. Not my most beautiful soldering work, but does the job...

How to do it: Scratch away the solder-stop from the ground plane, put solder there, put the caps in (touching the resistor wires), soldered on the GND side first then on the other side. So the caps are effectively from VPLUS or VMINUS to GND.

FdW · 22nd May 2012, 05:02 PM

Quote:

Originally Posted by Joachim Gerhard

Here we go :http://www.analog.com/static/importe...8-1_4898-2.pdf

Ahhh, that one 'Figure 7. Small Signal Frequency Response for Various Gains', the man at the lab here (ATL) call it a 'sbump'

FdW · 22nd May 2012, 05:08 PM

Quote:

Originally Posted by Joachim Gerhard

It not exactly my opinion but who am i ?articles

Thanks for that one, I do like opamps, attached a picture of my 'current work in progress'.

RCruz · 22nd May 2012, 05:25 PM

What is it ?

FdW · 22nd May 2012, 05:31 PM

Quote:

Originally Posted by RCruz

What is it ?

It is 'a bump'

Mpp

Joachim Gerhard · 22nd May 2012, 05:45 PM

Thanks Alfred. There is a package to you on the way where you can do the magic again.
Is that your new 1000W amplifier Frans ?

FdW · 22nd May 2012, 06:06 PM

Quote:

Originally Posted by Joachim Gerhard

Thanks Alfred. There is a package to you on the way where you can do the magic again.
Is that your new 1000W amplifier Frans ?

Yes, but about half of that bridged in 2 Ohms

but it is good for currents up to 80 Amps, and it lives of +- 70Volts (DC

)

RCruz · 22nd May 2012, 06:22 PM

Nice bump you have got there Frans

22nd May 2012, 05:25 PM	#5886
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	What is it ? __________________ RC

22nd May 2012, 06:22 PM	#5890
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	Nice bump you have got there Frans __________________ RC

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22nd May 2012, 11:42 AM	#5881
hesener diyAudio Member Join Date: Mar 2005 Location: Munich, Germany	So thats 24dB. This opamp even comes in a dual version, so only 7 components needed (opamp, two resistors, 4 blocking caps) - cute! what would we need to do to the Paradise to reduce the gain accordignly, without changing the RIAA time constants?

22nd May 2012, 12:19 PM	#5882
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I even DC coupled, or do the "blocking caps" be "decoupling caps"? I would not put a Paradise behind it, rather a shunt feedback RIAA, also with Opamps. This is Heresy anyway, Opamps in the MPP thread ! One could change the RIAA components in the Paradise for higher value caps and lower value resistors but there is a boundary on how much current the mirrors can drive.

22nd May 2012, 05:45 PM	#5888
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Thanks Alfred. There is a package to you on the way where you can do the magic again. Is that your new 1000W amplifier Frans ?