Speaker protecion for F5

Tyimo · 12th February 2013, 10:05 AM

Hi!
What should be the ideal speaker protecion for the F5 or any direct coupled relatives?
Is there any "official" solution?

Greets:
Tyimo

KatieandDad · 12th February 2013, 10:13 AM

In a word, there is no official solution. I believe the original design relies upon the sturdy design to protect itself.

ianc13 · 12th February 2013, 11:18 AM

While there isn't an official line on this if you are concerned then have a look in the diyaudio store. There is a PCB set for soft start + speaker protection (2 boards as a set) that will do the job. And you are supporting the forums if you do decide to buy.

Dzius · 12th February 2013, 11:49 AM

According to F5 manual there should be no more than 25mV at the speaker output, so isn't dangerous unless there is any fault.

ianc13 · 12th February 2013, 11:59 AM

Alas I had one channel of my F5 go pop and trigger one of my speaker protection boards. It was during normal operation so, while rare, these things can happen!

willamp · 12th February 2013, 12:24 PM

Early in my F5's life it was accidentally left on for a couple of days. When I had been using it the heatsinks had never gotten over 48 C but somehow during this couple of days something happened and the fuse blew. I found both output mosfets on the failed channel were now burned out. I had no speaker protection on it at the time but fortunately my speakers were switched to a different amp via a switchbox and weren't connected to the F5. After this I added the store's speaker protection board and lowered the bias from 1.3 to 1A after replacing the mosfets and source resisters. I haven't had any trouble with it since but definitely wouldn't go without the speaker protection again. And also, of course I'm much more careful that it doesn't get left on.

Dzius · 12th February 2013, 02:36 PM

Guess it had something to do with P1 and P2 potentiometers quality.

Tyimo · 12th February 2013, 02:58 PM

Quote:

While there isn't an official line on this if you are concerned then have a look in the diyaudio store. There is a PCB set for soft start + speaker protection (2 boards as a set) that will do the job. And you are supporting the forums if you do decide to buy.

Thanks!

willamp · 12th February 2013, 05:03 PM

Quote:

Originally Posted by Dzius

Guess it had something to do with P1 and P2 potentiometers quality.

Not sure what you mean about the pots. If you're referring to me lowering the bias, I only did that to be safer, and run a little cooler.

Bksabath · 13th February 2013, 12:04 AM

Gogle up NTE 7100 I am using those and Amplimo relay on my F5

12th February 2013, 10:05 AM	#1
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Speaker protecion for F5 Hi! What should be the ideal speaker protecion for the F5 or any direct coupled relatives? Is there any "official" solution? Greets: Tyimo

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12th February 2013, 10:13 AM	#2
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	In a word, there is no official solution. I believe the original design relies upon the sturdy design to protect itself.

12th February 2013, 11:18 AM	#3
ianc13 diyAudio Member Join Date: Oct 2005	While there isn't an official line on this if you are concerned then have a look in the diyaudio store. There is a PCB set for soft start + speaker protection (2 boards as a set) that will do the job. And you are supporting the forums if you do decide to buy.

12th February 2013, 11:49 AM	#4
Dzius diyAudio Member Join Date: Sep 2010 Location: Warsaw	According to F5 manual there should be no more than 25mV at the speaker output, so isn't dangerous unless there is any fault.

12th February 2013, 11:59 AM	#5
ianc13 diyAudio Member Join Date: Oct 2005	Alas I had one channel of my F5 go pop and trigger one of my speaker protection boards. It was during normal operation so, while rare, these things can happen!

12th February 2013, 12:24 PM	#6
willamp diyAudio Member Join Date: Dec 2011 Location: Austin, Texas	Early in my F5's life it was accidentally left on for a couple of days. When I had been using it the heatsinks had never gotten over 48 C but somehow during this couple of days something happened and the fuse blew. I found both output mosfets on the failed channel were now burned out. I had no speaker protection on it at the time but fortunately my speakers were switched to a different amp via a switchbox and weren't connected to the F5. After this I added the store's speaker protection board and lowered the bias from 1.3 to 1A after replacing the mosfets and source resisters. I haven't had any trouble with it since but definitely wouldn't go without the speaker protection again. And also, of course I'm much more careful that it doesn't get left on.

12th February 2013, 02:36 PM	#7
Dzius diyAudio Member Join Date: Sep 2010 Location: Warsaw	Guess it had something to do with P1 and P2 potentiometers quality.

13th February 2013, 12:04 AM	#10
Bksabath diyAudio Member Join Date: Dec 2007	Gogle up NTE 7100 I am using those and Amplimo relay on my F5