Question about IRAUDAMP1 comparator

ghabrius · 02:44 PM

Hi, I'm thinking of building the iraudamp1 from international rectifier, they have given a simple schematic using a very expensive comparator; LT1220.
So my question is , can I use another comparator like OPA4830. It's got twice the slew rate, can be powered from the same supply and costs half the price. Oh and it lacks the offset adjustment, something tells me it's not necessary.
Perhaps there are better opamps.

http://uk.farnell.com/linear-technol...oic/dp/1663400

http://uk.farnell.com/texas-instrume...sop/dp/1754999

Also I have another question is if you know or have heard of anyone who has built this amp on a diy pcb and got it working? thanks

nigelwright7557 · 14th May 2011, 08:26 PM

I would go for the one with offset adjust, I built a similar amp and it hummed with a slight offset.
I had to add a pot to adjust the offset.

hilli_billi · 17th May 2011, 06:14 PM

Hi ghabrius,

why iraudamp1?
There are the newer ones iraudamp7s and -t
I took the gerber files, that they offer, gave them to pcb manufacturer and received perfect boards. It's a one layer PCB, works fine. With this version you have some protection circuit. The parts are available here in germany, so should be even easier to get in the US.
At the moment I'm working on a layout for half an iraudamp7s for toner transfer methode.

14th May 2011, 02:41 PM	#1
ghabrius diyAudio Member Join Date: Feb 2007 Location: Boston	Question about IRAUDAMP1 comparator Hi, I'm thinking of building the iraudamp1 from international rectifier, they have given a simple schematic using a very expensive comparator; LT1220. So my question is , can I use another comparator like OPA4830. It's got twice the slew rate, can be powered from the same supply and costs half the price. Oh and it lacks the offset adjustment, something tells me it's not necessary. Perhaps there are better opamps. http://uk.farnell.com/linear-technol...oic/dp/1663400 http://uk.farnell.com/texas-instrume...sop/dp/1754999 Also I have another question is if you know or have heard of anyone who has built this amp on a diy pcb and got it working? thanks Last edited by ghabrius; 14th May 2011 at 02:44 PM.

14th May 2011, 08:26 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I would go for the one with offset adjust, I built a similar amp and it hummed with a slight offset. I had to add a pot to adjust the offset. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

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17th May 2011, 06:14 PM	#3
hilli_billi diyAudio Member Join Date: Feb 2007 Location: south of germany	Hi ghabrius, why iraudamp1? There are the newer ones iraudamp7s and -t I took the gerber files, that they offer, gave them to pcb manufacturer and received perfect boards. It's a one layer PCB, works fine. With this version you have some protection circuit. The parts are available here in germany, so should be even easier to get in the US. At the moment I'm working on a layout for half an iraudamp7s for toner transfer methode.