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Old 18th August 2005, 06:37 PM   #11
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Quote:
Originally posted by Bensen
Hi there,

Have you seen this relais:
http://www.vego.nl/amplimo/07/07.htm

It's a relais with a 100A rating NO contact, and right after is closes there closes a second smaller contact made of silver. This relais only costs 8.15 here in Belgium.

Pity the text is all in Dutch. The site should have an English version, at least, if not other European languages.

But the part looks very interesting.

Who is Amplimo?


Carlos
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Old 18th August 2005, 06:46 PM   #12
Bensen is offline Bensen  Belgium
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Carlmart,

Amplimo is our suplier of high quality toroidal transformers.
See: http://www.amplimo.nl/

You can pick also another language on this site.
You can compare these with the Plitron transformers (have I red on the forum).

Cheers.
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Old 18th August 2005, 07:03 PM   #13
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It's a great idea. I wonder if it can be emulated by two separate relays and a control circuit. Probably not as cutting off the PS will probably damage the low signal relay.
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Old 18th August 2005, 10:21 PM   #14
zinsula is offline zinsula  Switzerland
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Default Re: Looking for the best relay

Quote:
Originally posted by carlmart
Relays seem like a necessary evil on power-amp outputs if you want to prevent on/off thumps and protect the speakers from destructive DC off-set. Right? Or not right?
To protect the speakers from DC, you could also use big MOS-FET's to short the rails to ground and force rail fuses to blow.
To avoid power up thumps, you could use a relay which shortens the output to ground (so it's not in the signal path), together with bases/gates of output transistors. Watch out not to destroy the driver transistors though when doing it this way.

Quote:
Originally posted by carlmart
Then the quality of the contact's metal and plating seems to be essential. I have never seen any article reviewing relays brands or types, which I think would be more important than resistors, capacitors, diodes or even cables.

Does that metal & plating affect sound quality? Which is best?

Most do not specify what they use, and many of them look dangerously like nickel plated metal, probably copper.

Silver, gold-plate and silver cadmium-oxide are also popular on those that do specify the contacts. Which would be best or what sould we look for?
Some good information from Dimitri (although for line level relays):
http://www.diyhifi.org/forums/viewtopic.php?p=5779#5779


Ciao, Tino
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Old 18th August 2005, 10:36 PM   #15
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Remember (said the newby)

not all the relays have to be in the signal path. I am building a DC detection and thump on/off inhibitor for an Aleph 5. These mosfet amps you can short-circuit without problems. So I just mount a relais parallel on the speaker output.

Greetings, Harry
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Old 19th August 2005, 01:06 AM   #16
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Default Re: Re: Looking for the best relay

Quote:
Originally posted by zinsula


Some good information from Dimitri (although for line level relays)

Aren't reed relays the better option for line level signal control?
Or they also have disadvantages?


Carlos
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