Salas hotrodded blue DCB1 build - Page 200 - diyAudio
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Old 22nd June 2012, 02:02 PM   #1991
Salas is offline Salas  Greece
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Can you show a picture of the build? Idle PSU current is very high VS what the signal asks for, heat should be even enough after warm up and in box equilibrium. To make sure you should time it and note down readings from a thermocouple or IR gun on a specific spot. Also room temp should be comparable. Turn off power amp, give DCB1 an hour of full volume play from cool. Read temp on what is the hottest spot on its closed case. Turn off DCB1, let it reach room temp. Turn on without signal for an hour, keep power amp off, measure DCB1's case temp again. Note down room temp in audio rack's vicinity during those tests at start and end.
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Old 22nd June 2012, 02:04 PM   #1992
AndrewT is offline AndrewT  Scotland
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Change in mains voltage will make a big difference to dissipation.

Increase in mains voltage from UK's min of 226Vac to UK's max of 254Vac increases the dissipation by ~+26%.

The UK's supply should rarely and probably never arrive between 216Vac and 226Vac. That would indicate a fault, even though it is within specified tolerance.
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Old 22nd June 2012, 02:29 PM   #1993
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cheers Andrew + Salas for the QUICK replies.

the buffer works really well, and my post was to get a bit of an insight into the temperature variations. It never gets scary hot!

It did seem strange that the case felt hotter 1st thing in the morning, even though no signal was being passed, but maybe your thoughts Andrew are right on the UK mains variations.

During the day when the ambient temps are generally higher, the case usually feels cooler to the touch, even though it is generally being used.

I will try out your suggestions Salas and report back.

Brad
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Old 22nd June 2012, 02:32 PM   #1994
Salas is offline Salas  Greece
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If there is big mains play indeed in his grid, what you say Andrew can give significant dissipation differences no doubt. He must use his DMM on his mains also then and keep notes. Which I don't generally recommend if with cheap non trusted for input protection DMM. I have this thingy on my a/v rig by the way. I see only about 1-2V differences in my mains over the week. Also shows Hz, power consumption, so I can see each item's Watt draw and all together, I can give it kWh price and it can tell me the rig's energy cost over a period etc. And its always 50Hz spot on, good for my ac TT motor.
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Old 22nd June 2012, 02:35 PM   #1995
AndrewT is offline AndrewT  Scotland
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Salas, you must have a miracle worker controlling your mains electricity supply.
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Old 22nd June 2012, 02:43 PM   #1996
Salas is offline Salas  Greece
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There is a power hub building within 500m and a step-down/distribution transformer at the end of my road.
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Old 1st July 2012, 10:30 PM   #1997
jeff517 is offline jeff517  United States
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Default Matched Jfet's

I am a total new comer to this. How do you match these pieces?
Just want to know I have 10 of them.
Thanks for your patience.
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Old 1st July 2012, 10:44 PM   #1998
Salas is offline Salas  Greece
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Quote:
Originally Posted by AndrewT View Post
Salas, you must have a miracle worker controlling your mains electricity supply.
Worker must have gone to watch football, I saw +/-2.5VAC tolerance this weekend.
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Old 1st July 2012, 10:46 PM   #1999
Salas is offline Salas  Greece
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Quote:
Originally Posted by jeff517 View Post
I am a total new comer to this. How do you match these pieces?
Just want to know I have 10 of them.
Thanks for your patience.
Recently discussed again there: Simplistic NJFET RIAA
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Old 1st July 2012, 11:26 PM   #2000
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Man! Here's in Montreal we have extremely stable power. Always have ~120Vac... Pretty good!

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