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Old 26th February 2012, 12:54 PM   #2531
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Should be good there to if using dependable trafo.
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Old 26th February 2012, 02:04 PM   #2532
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Default The best of both Worlds

After a great deal of playing, I've now settled in for this weekend with my B1 running with the Salas Shunt reg. set at 180mA.

I do think that 600mA might get a bit warm in there but I might try 500mA later.

The B1 is a far more forgiving board when it comes to laying it out and is completely silent. A correctly laid out DCB1 is silent too, don't get me wrong.

I can use my wonderful Obbligato 10uF PIOs in this layout which suits me as I have a DC coupled amp.

The B1 doesn't need the dual reg, but, hey I'd built it anyway so I'm just using is as a 19V DC supply.

No humming, no buzzing and no distortion. Just pure listening pleasure. No relays, No turn-On thump, just everything as I would like it.
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Last edited by KatieandDad; 26th February 2012 at 02:14 PM.
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Old 27th February 2012, 02:18 AM   #2533
udailey is offline udailey  United States
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Quote:
Originally Posted by 2channel View Post
Thanks for your input.

Hi Uriah. That is very interesting about capacitive coupling on the LDRs. My supply is perhaps already similar to what you suggested (see circuit below). Do you think the Oscons are ok as final filtering elements? Any other suggestions for mods are welcome.

I think the problem I had might have been exacerbated because I use an LC filter after the rectifier bridge. This caused a weird looking waveform on the output of the bridge which seemed to also upset the transformer and produce some additional ringing on this and other windings.

The snubber I fitted is shown on the diagram. The waveform there is still strange, however the sharp resonances noticed on all windings are gone.

As an interesting bonus this snubber even eliminated the minor ringing on other windings which was generated independently of this circuit.

Jeremy
Jeremy,
Your supply should do the trick. Oscons are nice. I find them expensive. A Nichicon or Panasonic will give you the same effect. Dont forget to throw a film on the electrolytic's leads.
Uriah
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Old 27th February 2012, 04:12 AM   #2534
Salas is offline Salas  Greece
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Quote:
Originally Posted by KatieandDad View Post
just everything as I would like it.
Since you had output capacitor in service anyway, a good config decision. Enjoy.
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Old 27th February 2012, 10:50 AM   #2535
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Jeremy,
Your supply should do the trick. Oscons are nice. I find them expensive. A Nichicon or Panasonic will give you the same effect. Dont forget to throw a film on the electrolytic's leads.
Uriah
Great. I found the Oscons in my parts bin and thought "what the heck". Best I delve back in their for a film cap too.

Thanks for the advice.
Jeremy
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Old 27th February 2012, 04:22 PM   #2536
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I have a partial kit for the DCB1 mesmorize available if anyone is interested.

http://www.diyaudio.com/forums/pass-...ml#post2925027

Last edited by KatieandDad; 27th February 2012 at 04:26 PM.
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Old 27th February 2012, 04:43 PM   #2537
Salas is offline Salas  Greece
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The Mez takes up to 7 relays in total, not just one.
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Old 27th February 2012, 04:44 PM   #2538
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I'll reflect that in the advert, I only used two input channels so I would only use three.

I missed that as I used my B1 board that didn't use any relays.

Last edited by KatieandDad; 27th February 2012 at 05:00 PM.
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Old 29th February 2012, 11:38 AM   #2539
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I've just received my 3R3 resistors.

Unfortunately they were sold under a banner that did not read correctly

FOR SALE 3R 3Ohm Resistors. I assumed that was 3R3 but they are 3R0 or 3Ohm.

Never mind. Do you think 3R0 may be a little too low for my heatsinking ?
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Old 29th February 2012, 12:49 PM   #2540
udailey is offline udailey  United States
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You can always just try them. Keep an eye on the temp as it warms up. You wont kill anything if you plan ahead to turn off at a given temp and have a way to measure temp.
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