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Old 31st May 2012, 03:50 AM   #701
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Quote:
Originally Posted by Samuel Jayaraj View Post
On page 8 of the Build Guide, KSC 1845 (HG) has been shown as 845 missing the 1. Perhaps, correcting this could help many builders.
I'm not sure where you saw the KSC1845 nor the 845, what's in there is a KSC815 (HG) and is a valid alternative.

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Old 31st May 2012, 04:16 AM   #702
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Originally Posted by destroyer X View Post
You have reduced VAS current, and this made the whole difference....man! .... this deeply impresses me how lucky you are!

Was the heat that moverd you to do that? ..... just impressive....on target man!

Have i understood you changed Vas current to 8 mA? .... you got that! .... this is unbeliavable you did that and did very well ... you may have not an anjo taking care of you but an Arcanjo!

regards and be happy,

Charlie
Hi Charlie

Good to see your going well and still have sense of humour. Yeah I did change the VAS current to help with it. I am now working on a audio spectrum analyser to install into this amplifier to make it look pretty. I will experiment myself with that LC cap to see if sound changes. Please tell your nurse that if you have to strip down and get poked with a needle then you should be able do the same to her with your needle.

Regards

Simon
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Old 31st May 2012, 08:29 AM   #703
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Default Yeah!.... gonna do it Simon

Give a try with the original current (increase heatsink size) and compare.... if you did it, them let me know as i would like to confirm or dennie some tries i have made here with my own amplifiers.

If you like you post it...if not, then go to old uncle charlie mail box, you are always welcome there:

nanabrother@hotmail.com
carlos.eugenio1951@yahoo.com

Make videos Simon.... you make very good comparison videos man!

regards,

Carlos
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Old 1st June 2012, 05:04 PM   #704
SoIL4x4 is offline SoIL4x4  United States
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I am representing the beginner builder and have questions that reflect this. Having said that I am working on a digikey BOM for the power supply section of the amp, and have a few questions regarding some component choices. I would like to attain the full output potential of 150w @ 8r. Thanks in advance.
  1. The build guide recommends the Antek AN-8445 transformer for the power supply and is shown with two 1V20 power supply boards for a dual mono configuration. I am planning to use the two 1V20 boards as shown but am curious. In the first few pages of this thread it was suggested that a builder could alternatively use two 400VA transformers instead of the single 800VA transformer. This option was not mentioned in the build guide, are two transformers not recomended? Is it more difficult to achieve equal output from both channels?
  2. It has come up in other threads that Antek rates the output of their transformers differently than other manufacturers. Other members have suggested that users move up to the next VA selection to achieve the same performance as other brands. Was the 150watt @ 8r output measured with the AN-8445? Will other brands of transformer change the output measurements of the amp?
  3. Can anyone recommend where to source 10-12,000uf caps that are 30mm in diameter, 10mm lead spacing, snap in, and rated at or above 75V (and reasonably priced). I have found a few options at digikey in the 10-12,000uf range that have the right diameter and lead spacing but they are only rated to 63V. My calculation for a 45V secondary after rectification is 63.64V. This does not leave any elbow room for voltage fluctuation. The prototype amp appears to have 12,000uf 63V elna caps in the power supply, so am I missing something or were these just used for illustration purposes?
Sorry if this has been covered in the thread already, and thanks to everyone who helped put together this great project.
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Old 1st June 2012, 07:25 PM   #705
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Quote:
Originally Posted by SoIL4x4 View Post
I am representing the beginner builder and have questions that reflect this. Having said that I am working on a digikey BOM for the power supply section of the amp, and have a few questions regarding some component choices. I would like to attain the full output potential of 150w @ 8r. Thanks in advance.
[LIST=1][*]The build guide recommends the Antek AN-8445 transformer for the power supply and is shown with two 1V20 power supply boards for a dual mono configuration. I am planning to use the two 1V20 boards as shown but am curious. In the first few pages of this thread it was suggested that a builder could alternatively use two 400VA transformers instead of the single 800VA transformer. This option was not mentioned in the build guide, are two transformers not recomended? Is it more difficult to achieve equal output from both channels?
It won't be a true dual mono with a single 800VA from Antek. Both secondary windings will be wired to both of the PS boards if you go that route. With two 400VA you could have true dual mono amplifier, with completely separate power supplies. This would be ideal, but not if the cost difference is great, and it will take up more room.

Quote:
Originally Posted by SoIL4x4 View Post
It has come up in other threads that Antek rates the output of their transformers differently than other manufacturers. Other members have suggested that users move up to the next VA selection to achieve the same performance as other brands. Was the 150watt @ 8r output measured with the AN-8445? Will other brands of transformer change the output measurements of the amp?
I haven't read any mention of this, and maybe there is proof, but Antek's ratings seem fairly straight forward. Either way, the 800VA Antek is more than capable for Honey Badger.
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Old 1st June 2012, 07:45 PM   #706
SoIL4x4 is offline SoIL4x4  United States
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I used two transformers in my chipamp and would prefer to use two again I was just curious if there was a reason why this was not mentioned in the build guide, especially when referencing a dual mono build.
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Old 1st June 2012, 07:56 PM   #707
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The goal was probably to keep the build guide to essential configurations for the beginner, to keep it simple. They could go on for pages and pages about all the possible configurations for this amp.
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Old 1st June 2012, 09:39 PM   #708
Luke is offline Luke  New Zealand
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Isn't the rail voltage too high for 3 pairs of outputs? I would think that 35V secondaries and a 500VA transformer would suffice?
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Old 2nd June 2012, 04:49 AM   #709
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Quote:
Originally Posted by SoIL4x4 View Post
I am representing the beginner builder and have questions that reflect this. Having said that I am working on a digikey BOM for the power supply section of the amp, and have a few questions regarding some component choices. I would like to attain the full output potential of 150w @ 8r. Thanks in advance.
  1. The build guide recommends the Antek AN-8445 transformer for the power supply and is shown with two 1V20 power supply boards for a dual mono configuration. I am planning to use the two 1V20 boards as shown but am curious. In the first few pages of this thread it was suggested that a builder could alternatively use two 400VA transformers instead of the single 800VA transformer. This option was not mentioned in the build guide, are two transformers not recomended? Is it more difficult to achieve equal output from both channels?
  2. It has come up in other threads that Antek rates the output of their transformers differently than other manufacturers. Other members have suggested that users move up to the next VA selection to achieve the same performance as other brands. Was the 150watt @ 8r output measured with the AN-8445? Will other brands of transformer change the output measurements of the amp?
  3. Can anyone recommend where to source 10-12,000uf caps that are 30mm in diameter, 10mm lead spacing, snap in, and rated at or above 75V (and reasonably priced). I have found a few options at digikey in the 10-12,000uf range that have the right diameter and lead spacing but they are only rated to 63V. My calculation for a 45V secondary after rectification is 63.64V. This does not leave any elbow room for voltage fluctuation. The prototype amp appears to have 12,000uf 63V elna caps in the power supply, so am I missing something or were these just used for illustration purposes?
Sorry if this has been covered in the thread already, and thanks to everyone who helped put together this great project.


1. I indicated there that only the PSU was in a dual mono style configuration. Having separate rectifiers and their own cap bank per channel would still help for better channel separation. Of course using two separate transformers is ideal, I did not mention it in there to keep it simple.

2. I have not seen nor experienced any problems with the Antek tranny that I used in the prototype, if you are in doubt, then please feel free to use your own personal brand of transformer. The 150W @ 8R was tested by OS himself with +/-60V supplies. He also recommends 500VA to 600VA for two channels.

3. Your calculation of the VDC is spot on, but the Antek primary is rated at 230V and I live in a 220V country so I get a small reprieve. You are also correct about the "allowance" thing, you are not missing anything, we just like to be at the edge and push these things to the limits, of course I suggest you get a 75V or 80V cap for your build.


Here at DA Central, I try my best to put these projects at the edge, I do my very best to torture this amps too (I hope Jason and Mark does not read this ) in the hopes of giving beginners some form of "build tolerance" and leave the dangerous things to us.

Happy building!

Jojo
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Old 2nd June 2012, 04:50 AM   #710
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Originally Posted by Stormrider View Post
The goal was probably to keep the build guide to essential configurations for the beginner, to keep it simple. They could go on for pages and pages about all the possible configurations for this amp.
There you go. Thanks for summing that up.
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