My F5 (Cviller board) is as i described, dual mono and quiet dead.
That's the opposite, the more channels on one common PSU the more problems with ground loops.
My power supply board is up and running. I'm just missing a couple of parts for my F5 boards and I'm done.
I have + and - 29vdc from my PSU with no load. Is this OK?
I have + and - 29vdc from my PSU with no load. Is this OK?
bobodioulasso said:
True unless you have gnd directly connected to chassis and use safety gnd...
specialidiot said:
Sounds a bit high, but it might be ok. Is the toroid 2x18VAC?
specialidiot said:
What is the rating on your capacitors? The voltage will go down substantially when you drive the F5 boards.
PSU schematic
Samoloko, You need to watch that lower bridge. As drawn will result in a large mess when lower cap bank explodes! You have polarities of lower bridge reversed.
Samoloko, You need to watch that lower bridge. As drawn will result in a large mess when lower cap bank explodes! You have polarities of lower bridge reversed.
anyone got measured rails with load and no load
I got 25 Vdc no load and 22 Vdc with 2 F5 amps at 0.5 V bias
I got 25 Vdc no load and 22 Vdc with 2 F5 amps at 0.5 V bias
cviller said:
Thank you cviller, I appreciate the reply. I knew I'd bring it down a bit under load, but 29vdc seems high to me.
What is the correct gauge of wire to use for the power connections? I have 16 ga on hand.
specialidiot said:
"00" gauge !
Seriously, the transformer secondaries look like 16-18 gauge I would think that's enough.
The posted drawings from http://www.diyaudio.com/forums/showthread.php?postid=1814765#post1814765 and http://www.diyaudio.com/forums/showthread.php?postid=1814874#post1814874 are wrong - reversed polarity of the lower bridge
here corrected drawing
here corrected drawing
Attachments
I just found this nice thread about star grounding.
Hoping it can help.
http://www.diyaudio.com/forums/showthread.php?s=&postid=1403793#post1403793
Hoping it can help.
http://www.diyaudio.com/forums/showthread.php?s=&postid=1403793#post1403793
Hello CViller,
Just bought 2 F5 boards, and one PSU board by paypal.
Couldnt not send you email because i am newbie here..
Best regards,
-Niko from finland.
Just bought 2 F5 boards, and one PSU board by paypal.
Couldnt not send you email because i am newbie here..
Best regards,
-Niko from finland.
na said:
I got your order and paypal - thanks. My weekend is busy, but I'll send the boards on monday.
initial rail reading
Hi,
This was my 1st amp build (thanks N. Pass, C. Viller for boards, and U.Dailey for step-by-step power supply pictorial) and I bought my 1st multimeter and variac. I put everything together, plugged it in and slowly turned up the voltage to 125. I was very happy to see the little led lights glow. When I first measured the rails they were 29vcd!😱 😱
Some things I thought were perhaps my toroid was incorrectly labled (antek 300va 18x18) or my variac was defective. I had to turn it down to 105 volts to achieve 24vdc rails. My initial reading across r11 was 0. After p1/p2 adjustment my rails were 25 at 120volts and generally I have measured 22 to 23.5 average off the mains.
specialidiot said:
Hi,
This was my 1st amp build (thanks N. Pass, C. Viller for boards, and U.Dailey for step-by-step power supply pictorial) and I bought my 1st multimeter and variac. I put everything together, plugged it in and slowly turned up the voltage to 125. I was very happy to see the little led lights glow. When I first measured the rails they were 29vcd!😱 😱
Some things I thought were perhaps my toroid was incorrectly labled (antek 300va 18x18) or my variac was defective. I had to turn it down to 105 volts to achieve 24vdc rails. My initial reading across r11 was 0. After p1/p2 adjustment my rails were 25 at 120volts and generally I have measured 22 to 23.5 average off the mains.
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