Type of Pot Needed

[widmark]

I had an headphone audio in jack that wasn’t secure/connecting all the time so opened up this old 90s amplified 2.1 speaker trio and super glued it down, but in the process broke the subwoofer level pot.

From this pic, anybody have a guess at what specs/size of replacement pot to get?

UPDATE 8-9-20 - Looks like pot is 6mm width on knurled dial post and 15mm long (or about 1/4 in. and 5/8 in. respectively) and (based on comments) its a 50K linear pot. Pics of caliper readings below. Any suggestions as to specs for # of gangs, wattage and whether linear, audio or reverse audio is best would be appreciated. Thanks for all the input already, very helpful for this tinkerer!

There are mindnumbing levels of options for this pot on mouser: Bourns 50 kOhms 1 Turn 15 mm Potentiometers | Mouser

 

[Enzo]

Not by looking at it from the outside. What might be printed on the control's body inside?

 

[JonSnell Electronic]

Disassemble the unit and read the value, make and model from the actual pot. If an older amplifier, data should be readable. Probably Alps or Bournes will be the manufacturer.
Can't suggest a suppliers as I have no idea on which country you are.

 

[widmark]

Took me awhile to get back to this project. Here are pics from board and pot, where the broken pot knob is resting on top of the board. Marks on Pot showing TB50K a. Board shows PCB-1721-B.

Aside from not knowing what kind of pot to get as replacement, that superglue job on the audio jack probably needs something stronger. Any ideas on how to better secure?

Thanks again in advance.

 

[Enzo]

50k linear

 

[widmark]

Thanks Enzo! I’m new buying pots and electronic parts... any suggestions as to best manufacturers and/or parts sellers for this pot?

 

[widmark]

Pic of top side of pot. Looks like it says “Noble” on side.

 

[MAAC0]

that superglue job on the audio jack probably needs something stronger. Any ideas on how to better secure?

If it is an input jack, get a panel mount one and then wire it to the board or fit two RCA's. You can also try hot melt glue around it.
Those flimsy jacks are known to break.

For the pot get one with a knurled shaft like the original or fit another knob.

 

[russc]

Post 1 states its a headphone jack.
A panel mount one may fit.
Else a hot melt glue gun is pretty good - it can be disassembled for future repairs as required.
Maybe a photo of the jack?

 

[widmark]

OK... pic of audio input jack.


I'm going to update the OP with caliper measurements of the pot.

 

[widmark]

Post 1 states its a headphone jack.

Post 1 was incorrect Russ, my bad, it's an audio in jack. Post 1 now corrected, apologies.

 

[MAAC0]

Post 1 states its a headphone jack

As I deducted earlier from the photo it's the input jack.
System doesn't have a headphone jack.
The pot is a 6mm 1.5cm shaft length standard one.
Now, You need to find a small diameter pot since a standard doesn't fit or You'll have to dremmel the board.
Mixing desk pots come to me in mind.

 

[Enzo]

Have you fixed the clear broken solder on that jack?

 

[widmark]

Have you fixed the clear broken solder on that jack?

I didn't notice it thanks for pointing out Enzo. Will fix.

Still looking for guidance on other pot specs beyond 50K such as # of gangs, wattage, voltage and whether a) linear, b) audio or c) reverse audio is best.

These two at mouser look like possible replacements:

P160KNP-0QC15B50K BI Technologies / TT Electronics | Mouser
PDB182-K215K-503B Bourns | Mouser
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Here is a longer list of options from mouser: https://bit.ly/3fGPg4r

Thanks

 

[PRR]

> Still looking for guidance on other pot specs beyond 50K such as # of gangs, wattage, voltage and whether a) linear, b) audio or c) reverse audio is best.

Enzo already said 50k Lin and he usually knows what he is saying.

By inspection it has to be single gang. It may be rated as high as 0.5W but 99% of audio pots only handle 0.001W, so near zero volts.

 

[widmark]

He did say linear... scratch that Q. Thanks for this very helpful. Looks like I’ll be ordering this one... this one has straight pins unlike the one I posted prior.

P160KN-0QC15B50K BI Technologies / TT Electronics | Mouser

 

[widmark]

Got the replacement pot, but pin layout is slightly wider than needed.


Will be researching how to order the proper pin layout for second attempt, but if anybody knows, would be grateful for the info.

 

[Enzo]

Pots come in sizes. The larger one appears to be a common 16mm control, while your broken one is likely a 12mm pot. just measure the overall diameter/width.

 

[rabbitz]

As well as the pin spacing such as 2.5mm, 5mm etc so it matches the holes in the PCB.

 

[widmark]

Thanks. Went with this one, a Bournes pot (11.5mm body), waiting for delivery. Bournes sounds like a decent pot maker. The shipping charges add up quickly on these re-orders.

LINK

I got a replacement Switchcraft 3.5mm audio jack, one lacking an internal switch. Not sure if no internal switch was right choice. Reflowed the solder after Enzo flagged it for me, and the old one seems secure. Any idea as to whether I should have gotten a jack replacement with an internal switch and if so, how many switches? Asking bc old one may still be a fail, haven’t put the job back together.