F5 Turbo Builders Thread - Page 181

AndrewT · 21st April 2013, 08:14 AM

Apex has shown a triac style speaker protector that can be added to the speaker rather than to the amplifier. It uses the speaker signal to trigger itself.

AndrewT · 21st April 2013, 08:15 AM

Soft start is usually applied to the mains switching before the mains transformer. It would be less safe to incorporate all the mains switching to a PCB that also connects to the speaker cables.

WalterW · 22nd April 2013, 07:51 PM

Quote:

Originally Posted by buzzforb

Here ya to V3. No diodes, but overal bias higher than my V2. No miller compensation cap for instability. No heavy testing, but small stuff checks out fine.

Buzz,

In this setup on your photo you did use the 'jumper' on the PSU boards, to connect the two grounds.
But in my setup with the two PSU boards separated, should I connect this 'jumper'? Or put a ground wire of each PSU board to the F5T convertible AMP board?
Because on the AMP boards there is a coppertrack on both sides connecting the two PSU-G 's. So i think I will introduce a ground loop if I connect the 'jumper' on the PSU boards also...

Are you still with me? Sorry if it is not clear...

buzzforb · 22nd April 2013, 08:19 PM

That point becomes star ground. It is from that point that you ground the entire circuit to earth through the CL60/Bridge combo(Ground lift). What is important is that you have a central point to return all the power grounds to. The main board becomes your star ground for the signal wires. In truth, you could take signal grounds to PSU as well, but it is convenient and noise free just to take them to the boards, plus it allows for twisted pairs to the inputs and outputs.

WalterW · 23rd April 2013, 02:38 PM

Thanks for your answer, Buzz !
I don't understand the last lines...
Made two pictures of what I mean. Which one is preferred?
Grounding of an Amp is always an issue...

Grzz, Walter

AndrewT · 23rd April 2013, 02:44 PM

Trace out the route followed by the speaker current from PSU back to PSU for both schemes.
I think you will find that both are flawed.

WalterW · 23rd April 2013, 03:25 PM

Hi Andrew, this is better?

buzzforb · 23rd April 2013, 03:28 PM

Neither are ideal, but the first one is best option. I dont expect noise issues, but you know where to look if you have them.

WalterW · 23rd April 2013, 03:31 PM

Thanks for helping! Is there a better way to do it, with this setup?
I'm very open to suggestions

buzzforb · 23rd April 2013, 03:32 PM

I would try it and see if there is even any issue.

21st April 2013, 08:14 AM	#1801
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Apex has shown a triac style speaker protector that can be added to the speaker rather than to the amplifier. It uses the speaker signal to trigger itself. __________________ regards Andrew T. Sent from my desktop computer using a keyboard

21st April 2013, 08:15 AM	#1802
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Soft start is usually applied to the mains switching before the mains transformer. It would be less safe to incorporate all the mains switching to a PCB that also connects to the speaker cables. __________________ regards Andrew T. Sent from my desktop computer using a keyboard

22nd April 2013, 08:19 PM	#1804
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	That point becomes star ground. It is from that point that you ground the entire circuit to earth through the CL60/Bridge combo(Ground lift). What is important is that you have a central point to return all the power grounds to. The main board becomes your star ground for the signal wires. In truth, you could take signal grounds to PSU as well, but it is convenient and noise free just to take them to the boards, plus it allows for twisted pairs to the inputs and outputs. __________________ ...Shape the sound , Man!

23rd April 2013, 02:44 PM	#1806
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Trace out the route followed by the speaker current from PSU back to PSU for both schemes. I think you will find that both are flawed. __________________ regards Andrew T. Sent from my desktop computer using a keyboard

23rd April 2013, 03:28 PM	#1808
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Neither are ideal, but the first one is best option. I dont expect noise issues, but you know where to look if you have them. __________________ ...Shape the sound , Man!


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23rd April 2013, 03:31 PM	#1809
WalterW diyAudio Member Join Date: Oct 2012 Location: Utrecht	Thanks for helping! Is there a better way to do it, with this setup? I'm very open to suggestions __________________ Pass F5, F5Tv3, ACA, Aleph J, DDDAC1794, DCB1, BA3-preamp, VFET CSX1, Pass F6

23rd April 2013, 03:32 PM	#1810
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I would try it and see if there is even any issue. __________________ ...Shape the sound , Man!

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