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Building a Pearl 2
Building a Pearl 2
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Old 22nd February 2019, 12:52 PM   #1271
labjr is offline labjr  United States
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Quote:
Originally Posted by Lbcyclist View Post
Thatís the reason I used four pin XLRs.
As long as you don't have an expensive set of balanced headphones.
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Old 22nd February 2019, 03:43 PM   #1272
Enochrome is offline Enochrome  United States
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Quote:
Originally Posted by Mark Johnson View Post
Wrap a piece of tape around the cable at each end, right next to the XLRs. Use a wide black marking pen to write "DEATH CABLE!!" on this tape. Remind future-you (possibly inebriated-future-you) that this is not an ordinary cable.


Amazon.com: Glow X Fluorescent neon Gaffer Tape - 5 Pack. Cloth matt Finish is Reactive Under UV Blacklight. for Glow Parties and Art Projects. Each roll is 18 feet by .5 inches
Good Idea! How about skull and crossbones?

One more thing, I was double checking everything before my order and I realized I skipped over part C15 because I'm not sure what kind of capacitor that is?

Thanks
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Old 22nd February 2019, 04:18 PM   #1273
McQuaide is offline McQuaide  United States
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C15 is not required.
__________________
Mark
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Old 23rd February 2019, 02:38 AM   #1274
Lbcyclist is offline Lbcyclist  United States
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Quote:
Originally Posted by labjr View Post
As long as you don't have an expensive set of balanced headphones.
My only headphones are for my phone and computer.
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Old 10th March 2019, 03:53 AM   #1275
gigigirl is offline gigigirl
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Default Is +/-38 VDC to much

Hi Guys, Well I have finally received the parts as previously advise & put it together.

EI66 40W Power Transformer 220V TO 6V/9V/12V/15V/18V/36V AC Single/Dual DB-40VA | eBay

Dynamic Home Amplifier Rectifier Filter Fever Capacitor Board Audio Power Supply 691049210972 | eBay

Unfortunately the trans is putting out 27 v from both sides, so I am getting +/-38 from the recitier. Is this to high for the Pearl. If so how do I lower the voltage. Please remember I a a novice with AC circuitry.

Cheers
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Old 10th March 2019, 04:36 AM   #1276
6L6 is online now 6L6  United States
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Building a Pearl 2
It's going to come down a bit under load.

Did you get the NJM7824/7924 regulators? They can take 40v on the input, and you'll be fine.
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Old 10th March 2019, 08:29 PM   #1277
gigigirl is offline gigigirl
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Hi 6L6, I did not build the unit, (much to complicated for me) Have contacted the builder & he advised, yes he used NJM7824/7924 regulators. He also advised I should attach heat sinks at 38V as they currently do not have any. But still do not know why I cannot just use the adjustable LM317/LM337. Cheers
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Old 10th March 2019, 10:03 PM   #1278
6L6 is online now 6L6  United States
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Building a Pearl 2
Well, the circuit needs 24v regulators, so why not use a fixed.

Adjustability gains you nothing in this case, and anyway, your issue is input voltage, not output voltage.

Most importantly, the 317/337 have a different pinout and therefore don't fit the PCB, AND the required parts for set resistors and such are not on the PCB.

Wayne has used those very same regulators in products that cost well north of $10thousand, so I'd be perfectly content with them.

Last edited by 6L6; 10th March 2019 at 10:29 PM.
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Old 11th March 2019, 01:03 AM   #1279
gigigirl is offline gigigirl
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Hi 6L6, Sorry I did not explain myself correctly, of course I would change the regulators in the unit itself.
What I meant was that I have an external LM317 / LM337 Dual Power Adjustable Regulated Power Supply Board.
New Assembled LM317 / LM337 Dual Power Adjustable Regulated Power Supply Board 699985231662 | eBay
This would allow me to adjust the voltage down to a safe level for the unit, say +/-30 VDC.

Cheers
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Old 11th March 2019, 01:09 AM   #1280
6L6 is online now 6L6  United States
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Building a Pearl 2
Aha! That would also work.

I'd go with the raw supply personally and save that for a different project.
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