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JFET-MOSFET headphone amplifier J-Mo 3
JFET-MOSFET headphone amplifier J-Mo 3
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Old 22nd November 2017, 03:11 PM   #61
withmatt is offline withmatt  South Korea
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Anyone knows part number of 100k, dual gang, audio taper alps mini volume pot? I can not find it from Mouser, Digikey or farnell.
I would like to avoid bourns - pro audio pot due to channel imbalance.
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Old 22nd November 2017, 11:55 PM   #62
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Richard Murdey
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JFET-MOSFET headphone amplifier J-Mo 3
I'm not 100% certain but it looks like the highest value they make as a mini, stereo, audio taper, pot is 20K.

The part no. is RK09712200MT.
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Old 23rd November 2017, 12:48 PM   #63
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JFET-MOSFET headphone amplifier J-Mo 3
Oh right, I forgot to mention - I removed the trestrict layer that you put around the heatsink lugs, so unless you put them back please isolate the FETs and regulator from the heatsink using a thermal pad.

Generally I think its better to ground the heatsinks and isolate the active devices.

I hope the way you have the layout - with a ground plane shared by all the returns - is okay. It should be satisfactory, but there is an argument for instead tying the signal returns from each channel together before connecting down to the main ground plane. This would be better, but given the particulars of the way you've arranged the components rather difficult to execute.

Final note there is less room between the heatsinks than I'd like, getting into the space between them will need some smallish fingers so plan the build carefully to do the hard to access parts first, before the heatsinks are added.

/R
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Old 7th December 2017, 10:09 PM   #64
withmatt is offline withmatt  South Korea
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PCB just arrived.
I ordered to PCBWAY, they are fast and quality looks even better than Seeed.
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Old 7th December 2017, 11:28 PM   #65
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Richard Murdey
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JFET-MOSFET headphone amplifier J-Mo 3
Great! Looking forward to seeing what they look like cased up.
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