Ordering a Noir on Black Friday is the right thing to do...
One set with chassis will soon be on its way to Thailand.
One set with chassis will soon be on its way to Thailand.
Mine.
Set the bias to 5.1 volts and left it overnight, this morning it reads 5.106 and 5.107.
Gotta be happy with that.
Set the bias to 5.1 volts and left it overnight, this morning it reads 5.106 and 5.107.
Gotta be happy with that.
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Great job, fmmech_24! You're going to have a lot of fun with your HPA design!
You might want to experiment with different bias voltages and currents than the standard Noir, since your HPA will operate on a lower supply voltage than Noir. Different supply, different optimum bias point.
The IRF510 in your supply smoother, has a fairly large gate-to-source voltage drop. Thus the supply smoother has a fairly large input-to-output voltage drop, perhaps on the order of 4.0 or 4.5 volts.
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You might want to experiment with different bias voltages and currents than the standard Noir, since your HPA will operate on a lower supply voltage than Noir. Different supply, different optimum bias point.
The IRF510 in your supply smoother, has a fairly large gate-to-source voltage drop. Thus the supply smoother has a fairly large input-to-output voltage drop, perhaps on the order of 4.0 or 4.5 volts.
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I have ordered the items in the Mouser basket, save 2 items as these weren't in stock.
For the Alps (delivery expected Februari 2020) I chose as temporary replacement:
1688-RK16312A0B85
RK16312A0B85
ALPS Potentiometers
And for the Littelfuse I chose:
650-RXEF050-2
RXEF050-2
Littelfuse Resettable Fuses - PPTC
If there are better alternatives at Mouser, please advise, for other builders.
For the Alps (delivery expected Februari 2020) I chose as temporary replacement:
1688-RK16312A0B85
RK16312A0B85
ALPS Potentiometers
And for the Littelfuse I chose:
650-RXEF050-2
RXEF050-2
Littelfuse Resettable Fuses - PPTC
If there are better alternatives at Mouser, please advise, for other builders.
Hey fmm. There is a problem in your circuit. You are about to put the 24v to the Output. Also the bleederresistor is in the powersupplyline. Not on ground as it have to be. Dont know if it is a drawing problem or a "real" problem
PjVervoorn: those look like good choices. US and Canada buyers can also buy the ALPS Blue Velvet potentiometers from Parts Express (here is a LINK), maybe they will also sell to customers in Thailand (?). And of course eBay sells lots and lots of Blue Velvet pots, we just don't know whether they are counterfeit or genuine.
Hi Mark,
Thanks. Yes, Thailand it is. I plan to replace the Alps when the Noir is a keeper (comparing to the O2.)
Then I can just add it to another Mouser order and avoid both fakes and shipping costs.
Thanks. Yes, Thailand it is. I plan to replace the Alps when the Noir is a keeper (comparing to the O2.)
Then I can just add it to another Mouser order and avoid both fakes and shipping costs.
Yes you're right, thanks for the catch! The PCB is correct, and so is the schematic in the PCB CAD system, but the "make it pretty for human readers" version of the schematic for documentation, is upside-down. I'll fix it.
I have just tried out my Noir for the first time, source was a squeezebox touch and phones are AKG Q701, Totally amazed at the SQ of this amp. well done guys.
THANK YOU.
THANK YOU.
Congratulations, batty! Hope it was a quick fun job to put Noir together, and I'm thrilled you are pleased with the results.
Since you're in the US, the best idea is probably to just buy it from DigiKey (LINK).
Maybe the second best idea is to buy Mouser part number 710-74270035 , keeping in mind that its diameter is much larger than the Laird bead which the Noir PCB is designed to fit. I expect it might be a little tricky to thread a plastic cable tie through the mounting holes on the PCB, encircling and securing such a wide core. But you may prefer this kind of challenge, rather than placing a DigiKey order. Extra long (8" , 200mm) zip ties might be useful here since they allow you to have plenty of "slack" above and below the board, and yet be able to mate the two ends, as you're positioning the coil and gradually tightening the zip tie. Amazon Link
I used this one from fair-rite, which had very similar specs to the original (both physically and electrically) and did the job just fine for me:
https://www.newark.com/fair-rite/26...5023002&ddkey=https:en-US/Element14_US/search
They have stock for about 50c US.
https://www.newark.com/fair-rite/26...5023002&ddkey=https:en-US/Element14_US/search
They have stock for about 50c US.
In case that link doesn't work, go to the website of Newark / Element14 and search for
2675023002
which is the manufacturer's part number, or
70W1676
which is the Newark part number
That's the replacement which member avtech23 is suggesting.
2675023002
which is the manufacturer's part number, or
70W1676
which is the Newark part number
That's the replacement which member avtech23 is suggesting.