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Old 22nd February 2013, 11:48 AM   #401
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Hi Georg,

Just to confirm my order for 1 set of amp pcbs and 2 sets of Reg pcbs (one spare set).

Does anyone know of someone in a position to do 5 way matched sets of the 2013/313 Fets? I still have a 3 way matched set from the group buy, and would be interested in either a 4 way, or a full 5 way set - not in a position to do this myself, unfortunately.

Much appreciated GB - many thanks.
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Old 22nd February 2013, 11:49 AM   #402
juma is offline juma  Germany
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Quote:
Originally Posted by The Space Egg Corp View Post
......what is the function of the 1uF cap with 1.5R resistor in series, on the PSU ?...
1R5 is there to decouple reactances of small bypass cap and big filter cap in order to avoid posible resonances.
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Old 22nd February 2013, 08:34 PM   #403
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+1
I'm also interested in a stereo set
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Old 22nd February 2013, 09:42 PM   #404
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Originally Posted by danny_66 View Post
+1
I'm also interested in a stereo set
Please send PM with your shipping and email address.

Thanks,
Georg
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Old 23rd February 2013, 10:30 AM   #405
tinitus is offline tinitus  Europe
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might build mono amps like this
each with seperate box for power supply
reg boards placed with power amp
power supply box with high current caps
multiple small lytics close to output board
or at least thats the plan right now

my trafos are 400VA 2x 22V toroids
so the power supply box could also drive a turbo charged F5
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Old 23rd February 2013, 11:28 PM   #406
tinitus is offline tinitus  Europe
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well, if noone else have anything, I guess it will be ok to post my revised box 'vision'
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Old 24th February 2013, 05:48 AM   #407
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Originally Posted by tinitus View Post
well, if noone else have anything, I guess it will be ok to post my revised box 'vision'
Keep in mind that you will need considerable heatsinking for the regulators too.

For example: Secondary AC voltages of 2*22V will give you ~ 2*30V rectified DC. Regulated down to 2*20V means 2*10V*2A idle current ~ 40W dissipation per channel.
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Old 24th February 2013, 08:55 AM   #408
tinitus is offline tinitus  Europe
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wow, thats like a small power amp
well, there would be plenty of space for the reg on bottom of my power amp main heat sink
measures like 300x250x70mm, each channel
sure hope they can take the heat then
thanks

+/- 22V on amp rails ought to work ok, and give a bit less heat dissipation ?
with +/- 30 fed into the regs, what would be highest possible regulated output voltage ?
or what would be optimal operation voltage ?
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Old 24th February 2013, 09:35 AM   #409
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Quote:
Originally Posted by tinitus View Post
wow, thats like a small power amp
well, there would be plenty of space for the reg on bottom of my power amp main heat sink
measures like 300x250x70mm, each channel
sure hope they can take the heat then
thanks

+/- 22V on amp rails ought to work ok, and give a bit less heat dissipation ?
with +/- 30 fed into the regs, what would be highest possible regulated output voltage ?
or what would be optimal operation voltage ?
+-22V outputs should be possible.

That won't change your thermic balance however. Higher supply voltages will cause increased heating of the amp transistors.

Nevertheless, your heatsinks seem to be proper to manage that.

Last edited by permaneder; 24th February 2013 at 09:37 AM.
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Old 24th February 2013, 10:39 AM   #410
tinitus is offline tinitus  Europe
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Originally Posted by permaneder View Post
Nevertheless, your heatsinks seem to be proper to manage that
its really a full 1 meter from Fisher
too expencive, and stored for too long
due time to turn the heat on
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