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Old 22nd October 2010, 05:15 AM   #501
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin2069er View Post
Hi; I've got a couple of quick questions regarding the blue edition pcb board.

The .22u/100uf caps in the middle - what up with that? Is it two caps ( 1x .22uf and 1x 100uf) or something else?

I've noticed two resistors just before v+ / v- out (labelled '1') - are these on the BOM?

Thanks,
JG
1 Ohm resistors indeed. Test points use for those setting various voltages when used as a PSU unit for other stuff. You can either install or jumper them in a full DCB1.

Its 2 places (one per channel) for 0.22uF or even larger value plastic caps with many holes to aid size variation. The 100uF option is again for setting general PSU. Ignore the 100uF in a standard full DCB1 blue use. Films play better for it there.
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Old 22nd October 2010, 06:27 AM   #502
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Found the problem, it was a bent pin that wasn't making contact.

Thanks
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Old 22nd October 2010, 01:17 PM   #503
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Thanks.

Hmm, what kind of .22uf caps are people using here? The ones I bought look a little underwhelming.
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Old 22nd October 2010, 01:46 PM   #504
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DC-Coupled B1 Buffer Build

Maybe this will help, I ust found it. I still don't understand what value resistor to use.
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Old 22nd October 2010, 05:42 PM   #505
Salas is offline Salas  Greece
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Those 10R power resistors in BOM and written on board are good for circa 200mA standing current per rail.
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Old 22nd October 2010, 05:51 PM   #506
Marra is offline Marra  United Kingdom
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Quote:
Originally Posted by merlin2069er View Post
Thanks.

Hmm, what kind of .22uf caps are people using here? The ones I bought look a little underwhelming.
I used 2 MKP1837 0.1uf in parallel. Working well and sounding brilliant.
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Old 22nd October 2010, 06:58 PM   #507
TerryC is offline TerryC  United States
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Is it safe to test the regulator section unloaded (no parts installed in the buffer section) ?

Isn't the 10R current setting resistor quite over-spec'd at 5W (chance of burning it out zero under absolute worst case) ?
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Old 22nd October 2010, 07:25 PM   #508
qusp is offline qusp  Australia
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why not just place an appropriately sized resistor accross the output of the reg for load
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Old 22nd October 2010, 07:42 PM   #509
Salas is offline Salas  Greece
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Quote:
Originally Posted by TerryC View Post
Is it safe to test the regulator section unloaded (no parts installed in the buffer section) ?

Isn't the 10R current setting resistor quite over-spec'd at 5W (chance of burning it out zero under absolute worst case) ?
Theoretically yes, it seems too much, but after builders found the 2W ones hot enough (what it burns it burns it all the time, no pause, the body accumulates heat), they concluded a 5W part worked most comfortably.

No danger to test this one without a load.
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Old 22nd October 2010, 08:08 PM   #510
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Hi Salas,

I am confused about something, and it's probably basic electronics. The DCB1 power supply caps are connected with + and - sides connected together, to make + and - sides to the shunt reg (hence DC coupled, I guess). What I am confused about is why in this instance the + side of the bridge can feed the - side of the cap without making it explode. Is this the only instance in which a polarised cap can be put backwards, ie directly after a bridge?

Thanks as ever.
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