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Old 11th October 2011, 10:53 AM   #501
Salas is online now Salas  Greece
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So it works fine now, did you check the current by drop on your 8.2R?
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Old 11th October 2011, 10:57 AM   #502
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Not yet. It was late when I put it together last night and I didn't want to risk shorting something working at the angle I was. I'll get round to it sometime today.
I was excited by what I heard yesterday when it was only running at 9.5V. Looking forward to trying it again today and I think I'll leave the current heatsink as it is.
Chris
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Old 11th October 2011, 11:00 AM   #503
Salas is online now Salas  Greece
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Let us know CCS current and impressions later. Well done.
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Old 11th October 2011, 11:06 AM   #504
AndrewT is offline AndrewT  Scotland
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it does have a heatsink in my FM4. It is bolted to a metal strap that forms the metal compartment inside the main chassis.
I have just gone and checked.
I can feel the temperature rise around the mains IEC area compared to further away from that end where it is noticeably cooler. That temp rise is due to the heatsink transferring heat from the regulator to the chassis.

Yes the regulator runs hot. I have opened up and felt it. I can imagine many operating scenarios where the regulator may have to work at considerably higher temperatures. Higher temperatures than I have experienced could easily lead to device failure due to operation outside the specification limits.
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Old 11th October 2011, 11:12 AM   #505
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Yours must have been a later model taking steps to do something about the reg failure issue as there are no signs of holes for bolts or screws on mine.
Incidentally Andrew, is there a green diode on the pcb near the front of the chassis, to the left as you look at it from the front. There is on mine and it has never worked. Is it worth replacing?
Chris
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Old 11th October 2011, 12:50 PM   #506
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Voltage drop is 2.9V across 8.2ohms so about 0.35A and 1watt.
Chris
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Old 11th October 2011, 12:57 PM   #507
AndrewT is offline AndrewT  Scotland
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A shunt regulator for a 350mApk supply is not efficient and will run hot even with fairly large heatsinks.
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Old 11th October 2011, 02:17 PM   #508
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Well I've just spent an hour listening to the BBC Scottish Symphony Orchestra on Radio3 with the Salas reg and I have to say it is superb. Yes it is running hot but worth every penny to the electicity supplier. I shall post a more detailed description at a later date.
Chris
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Old 11th October 2011, 02:19 PM   #509
AndrewT is offline AndrewT  Scotland
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Ahh!
It's the Scottish contribution to the lovely sound.
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Old 11th October 2011, 02:20 PM   #510
Salas is online now Salas  Greece
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Ah, a Bib playing the Beeb.

Psycho Killer - The Ukulele Orchestra of Great Britain - BBC Proms - YouTube
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