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Old 28th August 2012, 09:40 PM   #641
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Ok shipping waived for next 48 hours. Joining us today brings us closer to the 30,000 review mark. Your contribution to the state of the art counts. Creates an opportunity for you to experience an exotic amplifier and share with us your experiences. There is no amplifier out there like this one.

Last edited by OnAudio; 28th August 2012 at 09:49 PM.
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Old 28th August 2012, 09:52 PM   #642
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Ok shipping waived for next 48 hours.
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Old 30th August 2012, 03:10 AM   #643
gootee is offline gootee  United States
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Quote:
Originally Posted by Kindhornman View Post
OnAudio,
thanks for the references. I had already ordered some Elna capacitors of that same value when I order the other parts for the build, I'll assume they are comparable for now. On the small film capacitor so that I am clear on this subject. From what I have read the film capacitors value is not that important right, just that there is a film capacitor in parallel with the electrolytic cap and removes issues with those caps. So if I happen to have a 10 or 100 mfd 100v cap sitting around would it matter if I just used that value or is there a problem with using a higher value cap? On the rectifier side are there any special qualities of one over another. Does the speed of the rectifier have anything of consequence here, would a Schottky diode bridge have any advantage here?
It is recommended to NOT place small film caps in parallel with large electrolytics. See:

paralleling film caps with electrolytic caps
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Old 30th August 2012, 05:06 AM   #644
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Default The PCB will look something close to this

Here is a draft of the PCB. This is just a draft the silk will be cleaned up. Show your interest here. Once we get 10 members the PCBs should be ready within 1 week. It will be 2 layer, 3 oz , lead free. A contribution of US $15 per PCB will be appreciated. Kindly show your interest here. You can read reviews for this amplifier here: Gallery

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Last edited by OnAudio; 30th August 2012 at 05:35 AM.
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Old 30th August 2012, 05:36 AM   #645
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Quote:
Originally Posted by OnAudio View Post
Here is a draft of the PCB. This is just a draft the silk will be cleaned up. Show your interest here. Once we get 10 members the PCBs should be ready within 1 week. It will be 2 layer, 3 oz , lead free. A contribution of US $15 per PCB will be appreciated. Kindly show your interest here. You can read reviews for this amplifier here: Gallery
How do you plan on mounting the output transistors on a heatsink with this configuration? The best thing would be to mount them underneath but you would need to make some holes on the PCB to accommodate this.

Ciao!
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Old 30th August 2012, 05:38 AM   #646
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Thanks Pinnocchio. Yes the transitors are mounted under PCB. There is no need for big holes on PCB. Transistors will be mounted onto heat sink before soldering.
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Old 30th August 2012, 05:43 AM   #647
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I believe that for easy servicing, the power transistors should be mounted flush against the board and heatsink and use the PCB with screw and washer as pressure plate. The other transistors could have a bigger hole to fit a screw through the board.

Doing it your way is not bad but if you have to replace one of the transistors, you basically have to unsolder all of them which could damage the board/components and is time consuming.

Also think of how to properly measure the proper hole distance on the heatsink is going to be a challenge and aligning all the pins at once to put back the board over is going to be challenging as well

Just my 2 cents!

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Last edited by pinnocchio; 30th August 2012 at 05:46 AM.
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Old 30th August 2012, 05:46 AM   #648
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Thanks Pinnocchio. However in the case that an amplifier fries its output stage, in most cases it fries all the output transistors.
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Old 30th August 2012, 05:47 AM   #649
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Quote:
Originally Posted by OnAudio View Post
Thanks Pinnocchio. However in the case that an amplifier fries its output stage, in most cases it fries all the output transistors.
I have edited my post above
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Old 30th August 2012, 05:50 AM   #650
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Thank you Pinnocchio. I will provide the document for the holes .
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