Comparing power supply of F-5 to F-1 - diyAudio
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Old 24th March 2011, 08:59 PM   #1
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Default Comparing power supply of F-5 to F-1

Looking at the F-1 power supply schematic and noticed it was extremely similar to F-5 with one exception:

The F-5 has a run off of the power supply ground, leading to the CL-60, which then goes to chassis ground.

The F-1 appears identical, except each cap bank has its own CL-60 going to ground, and they are not linked as in the F-5.

Can someone explain why this is, or would either amp work either way? I'm sure there is a simple reason I just am not aware of?

Russellc
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Old 24th March 2011, 09:06 PM   #2
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Quote:
Originally Posted by Russellc View Post
...... I'm sure there is a simple reason I just am not aware of?

....
exactly
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Old 25th March 2011, 12:38 AM   #3
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exactly
I will stare at it further. Until osmosis sets in!

Russellc
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Old 25th March 2011, 12:40 AM   #4
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osmozis will tell ya that

in F5 your nose is between two eyes

in F1 there is no nose ...... and eyes are wandering around ......
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Old 25th March 2011, 12:46 AM   #5
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Default look Ma !

......... there is one channel PSU
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Last edited by Zen Mod; 25th March 2011 at 12:50 AM.
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Old 25th March 2011, 12:47 AM   #6
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Default and ........

there is other channel PSU .........
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Last edited by Zen Mod; 25th March 2011 at 12:51 AM.
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Old 25th March 2011, 12:52 AM   #7
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Default MA! look again !

........ and there is just one channel PSU !

and one leg more , pulling down ........
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Old 25th March 2011, 02:17 AM   #8
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Oh I get it 1 Bipolar psu as opposed to 2 polar, on the lower channel if i use F1 psu board flip the polarity of the input from transformer flip my filter caps loose one thermistor tie lower + to upper -??? So i have B+ O B-

Dazed and confused , Elwood
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Old 25th March 2011, 03:00 AM   #9
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The F1 has two supply secondaries, isolated through
thermistors so as to absolutely minimize ground loops.

On a good day they measure about 20 uV unweighted
output noise.

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Old 26th March 2011, 02:43 AM   #10
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I probably would have figured it out when I went to tie p/s to F5 boards with their V+, GND, V-...

Or not and melted some three legged fuses.

Regards, Elwood
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