After some discussion with Kari regarding the part selection on the BOM I will be providing two different voltages for C9 thru C12. As the negative rail is only 9VDC a 25VDC cap here should be plenty, that would mean 2 x 25VDC and 2 x 100VDC, that caps will be different sizes but should have no effect on the working of the circuit. I suppose a larger value cap couls be used for better filtering. This small change if there are no insurmountable objections will save the GB a buck or two. It opens up more options for C4 & C5.
What would be the preferred value amoungst the members for these caps 10, 12, 15, 17, 20uF?
Regards
Anthony
What would be the preferred value amoungst the members for these caps 10, 12, 15, 17, 20uF?
Regards
Anthony
Hi,
looking at the transformer the current from the 60V windings should be the same as for the 15 (12V) windings since the current through the amp goes from plus to minus.
around 80-100mA per amp should be possible to let people experiment a bit.
So the spec would be 2x60V 100mA plus 2x15V 100mA wich is 60x0,2 plus 15x0,2 = 15VA.
A 100VA transformer would be overkil enough I think........and capable of 600mA bias per amp.
William
looking at the transformer the current from the 60V windings should be the same as for the 15 (12V) windings since the current through the amp goes from plus to minus.
around 80-100mA per amp should be possible to let people experiment a bit.
So the spec would be 2x60V 100mA plus 2x15V 100mA wich is 60x0,2 plus 15x0,2 = 15VA.
A 100VA transformer would be overkil enough I think........and capable of 600mA bias per amp.
William
Hi folks
If 15VA is minimum than I think we could settle with 60VA. 4x overkill ratio sounds reasonable to me.
That not only saves money for us, but also saves mother earth
Or?
The details about the secondaries I let you decide.
//V!T
Edit: WIKI open http://www.diyaudio.com/wiki/index.php?page=X-Bosoz+and+power+supply+GP
If 15VA is minimum than I think we could settle with 60VA. 4x overkill ratio sounds reasonable to me.
That not only saves money for us, but also saves mother earth
Or?
The details about the secondaries I let you decide.
//V!T
Edit: WIKI open http://www.diyaudio.com/wiki/index.php?page=X-Bosoz+and+power+supply+GP
Actually the transformer just needs 60VAC and 12VAC as the the X-BOSOZ is not a balanced +/- 60VDC rail.
So any configuration like a 30-0-30 and 0-12 can be used.
I was looking at this trransformer.
http://eshop.diyclub.biz/product_info.php?cPath=152_74&products_id=55
Model number R26-08??
0-32X2, 0-9-12
$15US you can configure for 32-0-32 and 0-12 Perfect I would say, am I wrong?
Regards
Anthony
So any configuration like a 30-0-30 and 0-12 can be used.
I was looking at this trransformer.
http://eshop.diyclub.biz/product_info.php?cPath=152_74&products_id=55
Model number R26-08??
0-32X2, 0-9-12
$15US you can configure for 32-0-32 and 0-12 Perfect I would say, am I wrong?
Regards
Anthony
As much as it pains me to admit, It might be hard to find a surplus transformer that combines the 2 voltages. Small transformers new are almost as expensive as large ones, so using a separate trans for 12v and another 55-60 is going to be pricey even at surplus prices. I'm hoping to have a separate one for each channel.
So, maybe in this case Victoria or Plitron up in Canada are the way to go. We could get quotes from each... Shipping is usually a killer, but these won't be THAT heavy.
So, maybe in this case Victoria or Plitron up in Canada are the way to go. We could get quotes from each... Shipping is usually a killer, but these won't be THAT heavy.
Sorry Coulomb, we cross posted. If the VA is Ok thats tempting,
but isn't the volts even higher than 60?Is it a toroid or what? shipping is the issue I guess. Those guys are in china, right?
Still I'm interested in the big local iron too, including Plitron someone needs to ask them .... I don't have even a moment to look this stuff over- work is getting out of hand, arrrrrggggghhhh -bye.
but isn't the volts even higher than 60?Is it a toroid or what? shipping is the issue I guess. Those guys are in china, right?
Still I'm interested in the big local iron too, including Plitron someone needs to ask them .... I don't have even a moment to look this stuff over- work is getting out of hand, arrrrrggggghhhh -bye.
Variac said:Sorry Coulomb, we cross posted. If the VA is Ok thats tempting,
but isn't the volts even higher than 60?Is it a toroid or what? shipping is the issue I guess. Those guys are in china, right?
Still I'm interested in the big local iron too, including Plitron someone needs to ask them .... I don't have even a moment to look this stuff over- work is getting out of hand, arrrrrggggghhhh -bye.
It is 50VA so it should be plenty according to earlier postings, I have been talking to Johnny about getting a discount for 70 of them and including them in the parts kit instead of the Caps.
Regards
Anthony
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