Gb: F5 Pcb - Page 71

sandbasser · 16th April 2009, 11:20 PM

Hi Christian -

Do you have parts suggestions or BOM for your Rectifier Bridge boards???

Thanks,

cviller · 17th April 2009, 05:46 AM

Diodes, use any three legged with Anode Cathode Anode legs. Example:
http://www.mouser.com/Search/Product...2fWe128j0pc%3d
(you can also use two legged, but then you need to bend the legs slightly)

Heatsinks, if you want to use onboard sinks use these:
http://www.mouser.com/Search/Product...GKJGAHIA%3d%3d

For the snubbers (resistor and capacitor) you can use 100ohm and capacitors in the 20-100nF range.

And of course you will need to buy 4 of each for one board.

RonD2 · 17th April 2009, 02:48 PM

Hi Christian,

I'm hoping someone can help me troubleshoot my F5. The amp (built with your boards) has worked fine for many months. Sounded great in fact. Suddenly while playing music it stops and begins to buzz in both channels.

A quick check shows the 24v DC at the outputs. No visible damage to the boards but I can't keep it powered on for more than 20 sec or so.

What would be the best way to proceed? Thanks in advance.

Ron

cviller · 17th April 2009, 03:15 PM

What happens after 20 sec? (don't connect speakers)

Do you have replacement components?

You have to start trouble shooting. If nothing burns when it is on, you can start to measure voltages - otherwise you have to figure out which component is shorting the whole thing (you solder out the power fets).

RonD2 · 17th April 2009, 05:41 PM

No speakers connected. Tested with inputs shorted and open. After 20 sec I start to smell burning. Power supply tests ok when disconnected.

I do have a second set of boards and components. I will build those while I troubleshoot these.

What doesn't make sense to me is that something happened to both boards at the same time.

cviller · 17th April 2009, 05:44 PM

Did you lose the negative rail?

strider75 · 17th April 2009, 05:59 PM

Quote:

Originally posted by cviller
Yes, I have psu, rectifier and f5 boards.

Great! I just ordered a PSU and 2 of the rectifier PCB's.

Thanks!

cviller · 17th April 2009, 06:18 PM

Quote:

Originally posted by strider75

Great! I just ordered a PSU and 2 of the rectifier PCB's.

Thanks!

Cool - I can see that.

I'll send the orders on Sunday.

RonD2 · 17th April 2009, 06:22 PM

I will check again but I don't think so (+/- 24 V).

smyslow · 17th April 2009, 09:59 PM

Hi Christian,

just sent you an order about some F5 and PSU boards.

Thanks for your effort.

smyslow

16th April 2009, 11:20 PM	#701
sandbasser diyAudio Member Join Date: Sep 2008 Location: Riverside, CA - USA	Hi Christian - Do you have parts suggestions or BOM for your Rectifier Bridge boards??? Thanks, __________________ - Ray

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17th April 2009, 05:46 AM	#702
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	Diodes, use any three legged with Anode Cathode Anode legs. Example: http://www.mouser.com/Search/Product...2fWe128j0pc%3d (you can also use two legged, but then you need to bend the legs slightly) Heatsinks, if you want to use onboard sinks use these: http://www.mouser.com/Search/Product...GKJGAHIA%3d%3d For the snubbers (resistor and capacitor) you can use 100ohm and capacitors in the 20-100nF range. And of course you will need to buy 4 of each for one board.

17th April 2009, 02:48 PM	#703
RonD2 diyAudio Member Join Date: Dec 2004 Location: MA	Hi Christian, I'm hoping someone can help me troubleshoot my F5. The amp (built with your boards) has worked fine for many months. Sounded great in fact. Suddenly while playing music it stops and begins to buzz in both channels. A quick check shows the 24v DC at the outputs. No visible damage to the boards but I can't keep it powered on for more than 20 sec or so. What would be the best way to proceed? Thanks in advance. Ron

17th April 2009, 03:15 PM	#704
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	What happens after 20 sec? (don't connect speakers) Do you have replacement components? You have to start trouble shooting. If nothing burns when it is on, you can start to measure voltages - otherwise you have to figure out which component is shorting the whole thing (you solder out the power fets).

17th April 2009, 05:41 PM	#705
RonD2 diyAudio Member Join Date: Dec 2004 Location: MA	No speakers connected. Tested with inputs shorted and open. After 20 sec I start to smell burning. Power supply tests ok when disconnected. I do have a second set of boards and components. I will build those while I troubleshoot these. What doesn't make sense to me is that something happened to both boards at the same time.

17th April 2009, 05:44 PM	#706
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	Did you lose the negative rail?

17th April 2009, 06:22 PM	#709
RonD2 diyAudio Member Join Date: Dec 2004 Location: MA	I will check again but I don't think so (+/- 24 V).

17th April 2009, 09:59 PM	#710
smyslow diyAudio Member Join Date: Feb 2009 Location: Villach	Hi Christian, just sent you an order about some F5 and PSU boards. Thanks for your effort. smyslow