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Chipamp IC amp kits & PC boards from ChipAmp

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Old 1st February 2018, 06:03 PM   #21
Hogwild is offline Hogwild  Canada
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Looking at POTS. Are they a standard pin layout/distance? Like I said, I'd really prefer to make soldering and desoldering/resoldering easy. My hands are not great.
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Old 1st February 2018, 06:30 PM   #22
scottjoplin is offline scottjoplin  Wales
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The layout is standard, that is looking from the front the left and right pins are the ends of the track and for a volume pot, left would be signal ground, right would be input, the middle is the wiper and would go to the amplifier along with the ground. The distances are not standard.
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Old 1st February 2018, 07:40 PM   #23
Hogwild is offline Hogwild  Canada
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PSU board and components are stock, as sold by Chipamp.com (CarlosFM snubberized).

Amp Boards are stock Chipamp.com LM3886, except for the following resistor changes to reduce gain:
Rf=20K
R2=20K
R3=1K

Everything else stock. No additional components (I'll add protection stuff when I have this sorted out).




Quote:
Originally Posted by Keruskerfuerst View Post
Can you give some more information?
PSU, board, values at LM3886,.....
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Old 1st February 2018, 08:59 PM   #24
Hogwild is offline Hogwild  Canada
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Should I be looking at a dual or stereo model, since I'm planning to build dual mono amps?
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Old 1st February 2018, 09:20 PM   #25
scottjoplin is offline scottjoplin  Wales
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Dual or stereo is the same thing, it's just two pots on the same shaft
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Old 1st February 2018, 09:39 PM   #26
Hogwild is offline Hogwild  Canada
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If I leave this permanently in the circuit, does it change the gain/resistor values? I dread desoldering/resoldering in new resistors.
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Old 1st February 2018, 09:43 PM   #27
scottjoplin is offline scottjoplin  Wales
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No, the gain of the amplifier remains the same, all the pot does is attenuate the input
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Old 1st February 2018, 10:12 PM   #28
Hogwild is offline Hogwild  Canada
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This is available, but so much cheaper.
Would it be noisy? I don't want noise.
RK16312A0B85 ALPS | Mouser Canada

This is more expensive, but beefier. Would it be likely to be less noisy
due to higher cost?
81A2A-B28-D15/D15L Bourns | Mouser Canada

Do you recommend using a PCB for the POT?
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Old 1st February 2018, 10:33 PM   #29
scottjoplin is offline scottjoplin  Wales
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They are both good quality pots from respected manufacturers, I doubt you'd hear any noise from either, but you pays your money and you takes your choice

Pots like those with pins are easier PCB mounted, some are available with tabs with a hole for wiring to directly but I've wired directly to PCB mounting pots, it's a bit fiddly though.
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Old 1st February 2018, 11:37 PM   #30
Hogwild is offline Hogwild  Canada
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I ordered a couple of POTS from PartsExpress. It was cheaper than the Bourne at Mouser and faster shipping to my location.

It will take a few days for them to get here. I hope you'll stick around to continue to help me figure out my signal problem. Thanks!
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