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Old 24th July 2013, 08:28 PM   #1181
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Hi
VERY cool looking!
I use a simple thumbrule:inlet area as large as possibel,outlet area same * 4.
This give a natural convection flow of the heat.(in an enclosure)
Anyway I would let them stick out as much as possibel.

Jan
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Old 24th July 2013, 09:53 PM   #1182
Variac is offline Variac  United States
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Heat sink looks good for one ch.

The 20 watt comment was that the amp is quite inefficient, to get the 5 watts output it "wastes" many times that as heat to the heatsinks. It's not a waste though- not when you hear it..

I like your idea of 2 totally independent towers on one base. It will really look good! Also very practical since you'll have switched inputs and volume control
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Old 27th July 2013, 07:11 PM   #1183
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I've assembled an external psu with one XP power ECM130PS24 smps (http://www.farnell.com/datasheets/310596.pdf) for two mono amps. I was using two generic laptop chargers previously.

The new PSU runs at 22.6V (after being adjusted to the lower limit). My old chargers ran at about 20.5V. I haven't checked or adjusted the bias yet, but it was sitting on 10V with the old supplies. Loudthud demonstrated that HF distortion reduced when bias was increased to 11V with (I believe) a 19V psu. On this basis I'm going to try changing the bias to 13V with the 22.6V psu after everything has warmed up again.

No dramatic change in sound quality so far. Perhaps a little more relaxed and resolved. I'm happy knowing that the new supply is likely to be far more reliable, produce less noise, psu voltage is the same for both channels and the smps switching frequency is well away from the audible range at 120khz.
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Old 27th July 2013, 07:17 PM   #1184
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Quote:
Originally Posted by Variac View Post
Heat sink looks good for one ch.

The 20 watt comment was that the amp is quite inefficient, to get the 5 watts output it "wastes" many times that as heat to the heatsinks. It's not a waste though- not when you hear it..

I like your idea of 2 totally independent towers on one base. It will really look good! Also very practical since you'll have switched inputs and volume control

thanks. as it is for my son i want to keep it clean and simple, and it must be sometihing good to look at. i hope to get it to run at around 10 watts as we will be building small speakers for him to.
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Old 29th July 2013, 02:59 PM   #1185
dodog is offline dodog  United States
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More stupid questions....

When using Keratherm or Sil-Pad insulators, do you still need to use thermal grease or do you just use this as-is between the MOSFET and the heat-sink?

Does anyone know a source (Digikey, Mouser) for a jack-connector (preferably chassis mount) for an EIAJ-05 connector? I have two power supplies with this tip and am finding it very hard to find a mate. I can find a PCB mount but that will be very hard to cut/mount to a chassis. I could suck it up and buy two more power supplies but I'd like to use these, if possible.
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Old 29th July 2013, 03:06 PM   #1186
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Quote:
Originally Posted by dodog View Post
More stupid questions....

When using Keratherm or Sil-Pad insulators, do you still need to use thermal grease or do you just use this as-is between the MOSFET and the heat-sink?

Does anyone know a source (Digikey, Mouser) for a jack-connector (preferably chassis mount) for an EIAJ-05 connector? I have two power supplies with this tip and am finding it very hard to find a mate. I can find a PCB mount but that will be very hard to cut/mount to a chassis. I could suck it up and buy two more power supplies but I'd like to use these, if possible.
Will this work for you?

Regards,
Sachin
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Old 29th July 2013, 03:10 PM   #1187
dodog is offline dodog  United States
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Quote:
Originally Posted by sachu888 View Post
Will this work for you?

Regards,
Sachin
Sachin, there isn't a link.

I did some digging and found one at MCM electronics. I should have checked there as they seem to have everything:

DC Panel Mount Jack Eiaj 4.35x6.5x1.4 Plastic (eiaj V) | 027-5883 (0275883) | Distributed By MCM
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Old 29th July 2013, 03:13 PM   #1188
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Quote:
Originally Posted by dodog View Post
Sachin, there isn't a link.

I did some digging and found one at MCM electronics. I should have checked there as they seem to have everything:

DC Panel Mount Jack Eiaj 4.35x6.5x1.4 Plastic (eiaj V) | 027-5883 (0275883) | Distributed By MCM
Sorry,here it is http://in.mouser.com/ProductDetail/K...Jm1QV1qQ%3d%3d

Regards,
Sachin
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Old 29th July 2013, 03:16 PM   #1189
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I found many here http://in.mouser.com/Connectors/Powe...z0z812Z1z0z63x

Regards,
Sachin
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Old 29th July 2013, 03:22 PM   #1190
bcmbob is offline bcmbob  United States
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Quote:
Originally Posted by dodog View Post
....When using Keratherm or Sil-Pad insulators, do you still need to use thermal grease or do you just use this as-is between the MOSFET and the heat-sink?
Please see this post and Andrews answer.
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