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Old 19th October 2008, 11:48 AM   #1901
ashaw is offline ashaw  Australia
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Would the following PSU be okay for The balanced F5 posted by Patrik a while ago?

I was thinking 4 Jenson 47000uF caps per rail per channel, could i get away with less?
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Old 19th October 2008, 12:00 PM   #1902
stein2 is offline stein2  Serbia
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Quote:
Originally posted by ashaw
Would the following PSU be okay for The balanced F5 posted by Patrik a while ago?

I was thinking 4 Jenson 47000uF caps per rail per channel, could i get away with less?

Look at SM, it can't be much simpler. I have 2x22.000uF followed by 2x 25W R22 and 4x 33.000uF per channel. Across the 22.000 caps additional 1u/250V and the 2k2 5W resistor as well. Hope the simulation is just for one of two required rails per channel.
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Old 19th October 2008, 12:12 PM   #1903
ashaw is offline ashaw  Australia
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SM? so like this - per rail?

(note steped load 5 than 10A)
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Old 19th October 2008, 12:53 PM   #1904
stein2 is offline stein2  Serbia
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Quote:
Originally posted by ashaw
SM? so like this - per rail?

(note steped load 5 than 10A)

Something like that. 18VAC before the bridge but twice, meaning 18-0-18VAC to get rectified 24VDC per rail, plus and minus 24VDC measured from the center tap. SM is service manual downloadable from passdiy site ...
There's a full schematic drawing of the suggested PSU, but really not critical. Across each 22.000uF goes one 2k2 5W (can go with less power but I had these at hand)

I have a single 500VA transformer (toroid) with four 18VAC secondaries. Go back a few posts and pages and check it out. Very simple, very stable, completely silent... I suggest you get one NTC TH with around 6-10 Ohms for the primary that will act as a soft start and two more to ground the signal's ground. But it's all in the manual...
Here's the direct link to the service manual for F5
http://www.firstwatt.com/downloads/F5-om_sm-080527.pdf
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Old 19th October 2008, 01:11 PM   #1905
ashaw is offline ashaw  Australia
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Note i said Patrick's Balanced F5, IE this one,
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Old 19th October 2008, 01:42 PM   #1906
stein2 is offline stein2  Serbia
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Ok, then, sorry for talking about higher rail voltages. Still, adding the drain resistor across the first pair of caps and being wise about the grounding plus adding the thermistor in the primary remains a valid recommendation. I guess you have the service manual at hand and that you have checked how it was done.
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Old 19th October 2008, 02:09 PM   #1907
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Patrick's balanced Cct uses just 4 amps per channel (2A per side).

Suggest smaller caps in R-C-R-C configuration if using Jensens - not the usual setup but very effective - 1st cap (ripple) = 10,000 (maybe 22) and 2nd cap (power)= 22,000 (maybe those 47s) and R = 0.1R - 0.12R.

Not sure about those 1N5828 diodes on design spec - studs?
Avoid the cheap Jaycar, etc trannie - better to spend some $s.
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Old 20th October 2008, 05:58 AM   #1908
ashaw is offline ashaw  Australia
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Really, Jest 4A,

so it will do only about 10W?

The diodes are just that, Ones the program has in it's memory bank
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Old 23rd October 2008, 04:28 AM   #1909
Wasim is offline Wasim  Pakistan
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Hi All,

This amplifier seems to be very good. Those who have built this ... How does it sound? Which transformer did you use?

Reg
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Old 23rd October 2008, 02:02 PM   #1910
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Quote:
Originally posted by Wasim
Hi All,

This amplifier seems to be very good. Those who have built this ... How does it sound? Which transformer did you use?

Reg

Many F5 builders confirm that the F5 sound is great.
You could use any good quality of transformer.

Cheers,

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