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Markoz12

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Reply with quote  #1 
Hands up those who have the Raagini Digital Tanpura and the on/off volume control crackles and cuts out intermittently?

I've fixed mine today and it is now perfect. The two control pots (on/off volume and the Ladies/Gents control are flimsy minute nylon shaft pots that have way too much movement causing the wiper (internal moving part that regulates the output) to make and break contact with the carbon track.

The hardest part has been finding a replacement on/off volume control of the correct value. I have sourced the perfect part.

Initially I thought the switch part was switching the mains voltage, but it isn't, it is switching the 12V supply to the circuit board on the secondary side of the transformer.

Anyway, if you have this problem you can source the following parts:

On/Off volume pot is 10K Log (Audio taper). This part on E-bay is perfect:

http://www.ebay.co.uk/itm/120774177287?ru=http://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=120774177287&_rdc=1

Select A10K from the drop down list of values.

The Ladies/Gents pot is 100K Lin (Linear). This part on E-bay is perfect:

http://www.ebay.co.uk/itm/1X-Alpha-potentiometer-100k-linear-lin-16mm-GUITAR-EFFECTS-STOMPBOX-MIXER-POT-/261147904464?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3ccda0c9d0

Because the replacement pots have splined shafts you will need to replace the knobs which fit on top.
These knobs are perfect replacements:

http://www.ebay.co.uk/itm/Hard-Plastic-Mixer-Control-Knob-for-6mm-Splined-Shaft-pots-Various-Colours-/120812573339?pt=UK_BOI_Electrical_Components_Supplies_ET&var=&hash=item1c20fd929b

They are black but you can choose what colour marker you want on them.

It is a simple changeover job if you are able to solder, otherwise I would suggest you find someone who can solder. It is literally wire for wire replacement. I would always advise drawing out the connections to the pots on a piece of paper before hand as this will help as a back up.
I'm an electrical engineer so the task was simple for me, but I thought I would share it with anyone here suffering with the issue.

From a health and safety point of view make sure that the unit is NOT plugged into the wall socket and remove all the batteries from the unit before attempting the repair.

After replacing the pots:

http://i244.photobucket.com/albums/gg39/TriSonics/Raagini%20Digital%20Tanpura/th_P5091119.jpg
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Sitarfixer

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Reply with quote  #2 
WELL DONE ! ! !
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http://www.karaseksound.com/
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Markoz12

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The new "replica" knobs arrived and fitted. I had to cut the pot shafts down a little so the skirt of the knobs were closer to the top of the box.
I hate changing the original look of anything unless I have to.
All looking and sounding as it should.....no snap, crackle and pop!

Now on to the next project........!

http://i244.photobucket.com/albums/gg39/TriSonics/Raagini%20Digital%20Tanpura/th_P5131158.jpg
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desh

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Hi Markoz12,

Thanks for posting this!!!
Quote:
Originally Posted by "Markoz12"
Hands up those who have the Raagini Digital Tanpura and the on/off volume control crackles and cuts out intermittently?
I have the same problem with my Taal Tarang http://www.soundlabs.in/musical-instruments/taaltarang-tabla.shtml. Would you know if the taal tarang uses the same value on/off volume control as the Raagini Digital Tanpura?

Thanks
Desh
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Markoz12

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Reply with quote  #5 
If you look inside your unit (make sure you remove the mains power lead!) you should be able to read the details from the switch/volume.

If you pull the knob off the switch/volume and loosen the nut, you can remove the switch. Look on the top and there will be some letters and numbers.

Read them and post back here. I will then be able to tell you.

If you are careful, you will not damage anything.

Mark.
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trippy monkey

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Reply with quote  #6 
Stop playing with your knob!!! :wink:

Nick
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Markoz12

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Reply with quote  #7 
You have to twiddle it occasionally! ops:
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trippy monkey

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Thought you were married????
Or have I hit on a sore point?? FNAAR FNAAAR!!!! :wink:

Nick
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Markoz12

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barend

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Reply with quote  #10 
has someone noticed that these Raagini machines have to warm up 10 minutes or so. When you start the pitch changes slightly after awhile and then after some time it stays on the same pitch. Don't now if the latest models also have this problem?
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Markoz12

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Reply with quote  #11 
I'll have to check mine. Can't say I noticed.
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TBo22

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Reply with quote  #12 
Greetings,
Thanks for this thread!
My Raagini volume potentiometer shaft came loose several months ago. I examined it to find that the housing on the pot, as it abuts to the Raagini case, had separated. I was able to superglue it back together for a temporary fix, but that was indeed temporary. 

After discovering your post I ordered the new pots: 10K linear for the on/off-vol, and the 100K linear for pitch. However, the pots don't match what I have. My on-off-vol pot is a stacked pot. 

Raagini onoff vol pot 2.jpg 

I'm not trained in electronics, so am not sure why this is a stacked pot and therefore don't know how to proceed with repairing it. 

Any advice/guidance would be most welcome. 

Thanks!


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david

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Reply with quote  #13 

It appears that the second level is the power switch.  If you are desperate, you can permanently solder these leads together. But if it were me, I would just order another pot. Furthermore, you will probably find that a liner taper pot will not work nearly as well as an audio taper.

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TBo22

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Reply with quote  #14 
Greetings David,

Thanks for your reply! At this point the stacked pot is no longer functional, the top plate that secures the shaft has broken off the pot housing, so I can't just solder the two together. 
 
Do you know where I might find a suitable replacement pot for this?
 
Would it be appropriate to simply replace the stacked pot with the 10K audio taper pot mentioned in the early posts of this thread even though it's not a stacked pot?: 

"On/Off volume pot is 10K Log (Audio taper)."

Thanks,

Tim

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david

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Reply with quote  #15 
They will always say whether they have an integral on/of switch and yes, "Log" means the same thing as Audio Taper.  It is a very common configuration.  Another common configuration is a stereo/on-off/audio taper.  I do not know how much room you have inside the box but if you have a lot of room, this would also work.  You would just ignore one of the integral pots.
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