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Old 22nd May 2012, 11:42 AM   #5881
hesener is offline hesener  Germany
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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?
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Old 22nd May 2012, 12:19 PM   #5882
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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.
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Old 22nd May 2012, 02:29 PM   #5883
hesener is offline hesener  Germany
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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.
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Old 22nd May 2012, 05:02 PM   #5884
FdW is offline FdW  Netherlands
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Originally Posted by Joachim Gerhard View Post
Ahhh, that one 'Figure 7. Small Signal Frequency Response for Various Gains', the man at the lab here (ATL) call it a 'sbump'
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Old 22nd May 2012, 05:08 PM   #5885
FdW is offline FdW  Netherlands
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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'.
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Old 22nd May 2012, 05:25 PM   #5886
RCruz is offline RCruz  Switzerland
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What is it ?
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Old 22nd May 2012, 05:31 PM   #5887
FdW is offline FdW  Netherlands
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What is it ?
It is 'a bump' Mpp
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Old 22nd May 2012, 05:45 PM   #5888
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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 ?
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Old 22nd May 2012, 06:06 PM   #5889
FdW is offline FdW  Netherlands
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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 )
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Old 22nd May 2012, 06:22 PM   #5890
RCruz is offline RCruz  Switzerland
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Nice bump you have got there Frans
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