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Old 3rd June 2010, 05:01 AM   #8001
fingerx is offline fingerx  Hong Kong
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More,,,what is the opinion of using speaker protect circuit/relay? I found it really affect the sound, esp bass, transparency, right now I trend to not using it, and my F5 was get rid of ztx450/550, NTC, am I taking risk?
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Old 3rd June 2010, 11:11 AM   #8002
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If you ask the question you know the obvious answer.

Amplimo manufactures a unique LSP protection relay that is inaudible on 9 of 10 power amps, the LR(Z) relay dates back as far as their takeover from ILP in the late 1980s.

Too slow for fast BJT output power amps for my taste, for which i use two parallel 4-layer SDS relays with a delay that handle 160A peak, 40A continuous and 8000VA.
I could show you relays which are totally out of this world, completely inaudible for decades, but out of reach for both DIYer and pro amp manufacturer.

Combined with intelligent protection circuitry of proven track record, such as a NEC uPC1237, the LR(Z) relay would work like a charm with a power amp as the Fist 5.
Search Janneman (linearaudio.nl) for more on the Amplimo relay.
There are a few comparable relays from other manufacturers, not superior to the LR(Z) but more difficult to obtain.
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Last edited by jacco vermeulen; 3rd June 2010 at 11:21 AM.
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Old 3rd June 2010, 11:15 AM   #8003
EUVL is offline EUVL  Europe
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I have speaker protection in all my power amps. They are not in the signal path.
When you have a fault, you want to make sure the output has no voltage, and the power supply is switched off as fast as possible.

You might have to sacrifice your output devices and protection relays. But they are cheaper compared to good speakers.
Not for the faint-hearted.


Patrick
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Old 3rd June 2010, 08:15 PM   #8004
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My F5 is alive, my first non chipamp project. It is a very sweet amp.
Thank you Papa !
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Old 3rd June 2010, 10:41 PM   #8005
tinitus is offline tinitus  Europe
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Old 4th June 2010, 03:32 PM   #8006
fingerx is offline fingerx  Hong Kong
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Quote:
Originally Posted by fingerx View Post
Hi there,

Hello everybody, some questions, what is the value of the gate stopper? I saw someone even short them when I go though the thread, the orginal circuit found in FirstWatt website is 47R, however I read the F5 review from 6moon is shown 150R in the pictures? What is the effect when the value is change? My F5 was almost done, perhaps need some final fine tune, I may post the picture when I get back the DC from my girlfriend, Cheers.

Alvin
Anyone have an answer on the gate stopper? 47r or 100r, 150r?
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Old 4th June 2010, 03:49 PM   #8007
fingerx is offline fingerx  Hong Kong
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Quote:
Originally Posted by EUVL View Post
I have speaker protection in all my power amps. They are not in the signal path.
When you have a fault, you want to make sure the output has no voltage, and the power supply is switched off as fast as possible.

You might have to sacrifice your output devices and protection relays. But they are cheaper compared to good speakers.
Not for the faint-hearted.


Patrick
Patrick, yup, are you connected the protect relay to the AC mains? what do you think since the amp output still in parallel to the protect circuit?
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Old 4th June 2010, 04:47 PM   #8008
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Sounds more as EUVL merely shorts the output to ground with the relay.
Fries all output devices, right after current soldering the relay contacts.
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Old 4th June 2010, 07:54 PM   #8009
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Quote:
Originally Posted by fingerx View Post
Anyone have an answer on the gate stopper? 47r or 100r, 150r?
The Gate stopper is nominal. Any of those values will work.

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Old 4th June 2010, 08:18 PM   #8010
EUVL is offline EUVL  Europe
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Almost correct, except that you forgot I only build balanced amps.



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