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[Official] OCN Headphones and Earphones Club - Page 563

post #5621 of 38141
Completed one of the priorities on my to-do list over winter break last night - successfully switched my Little Dot II from 220-240V to 110V so I could actually use it here in the States.

My friend's father is an electrical engineer, so he provided all of the help necessary. Essentially, and pardon me if this does not make sense since circuits are not my forte in the slightest, the four wires that comprise the power windings for the transformer were placed in a serial layout. All we needed to do was place them in parallel, which simply involved stripping the two wires leading to the power plug termination on the back of the amp and soldering them to the other two wires (having them correctly correspond to each other of course). This successfully stepped the amp down to 110V, which we confirmed through a few tests with a voltmeter. I didn't understand all of the intimate details of it, but my friend's dad told me that it is perfectly fine for normal use now. It was pretty fun to use his external transformer to slowly run up the voltage through the amp when we were still trying to figure out exactly what needed to be done to switch it.



It is alive . Sounds pretty good and will see a lot of use at school, as I only intend to bring this amp, my cdp, and the HD580 with me for the semester. The rest of the rig will stay safely at home, away from the chaos that is life in a dorm.
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post #5622 of 38141
May I join ?

Cans: Sennheiser HD 595's
Mic: Some generic Logitech
Heaphone Amp: DIY Cmoy headphone Amp, in an Altoids tin! (woooo!)


Happy New Years
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post #5623 of 38141
Cans: HD555
Portable: Klipsch x10 w/ custom tips
Portable Amp: FiiO E5

pink
post #5624 of 38141
Quote:
Originally Posted by phospholipid View Post
im guessin he's gonna say grados
Blasphemy, I would never say grados My music needs to be able to reproduce multiple instruments dammit.
    
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post #5625 of 38141
Quote:
Originally Posted by Aura View Post
Completed one of the priorities on my to-do list over winter break last night - successfully switched my Little Dot II from 220-240V to 110V so I could actually use it here in the States.

My friend's father is an electrical engineer, so he provided all of the help necessary. Essentially, and pardon me if this does not make sense since circuits are not my forte in the slightest, the four wires that comprise the power windings for the transformer were placed in a serial layout. All we needed to do was place them in parallel, which simply involved stripping the two wires leading to the power plug termination on the back of the amp and soldering them to the other two wires (having them correctly correspond to each other of course). This successfully stepped the amp down to 110V, which we confirmed through a few tests with a voltmeter. I didn't understand all of the intimate details of it, but my friend's dad told me that it is perfectly fine for normal use now. It was pretty fun to use his external transformer to slowly run up the voltage through the amp when we were still trying to figure out exactly what needed to be done to switch it.



It is alive . Sounds pretty good and will see a lot of use at school, as I only intend to bring this amp, my cdp, and the HD580 with me for the semester. The rest of the rig will stay safely at home, away from the chaos that is life in a dorm.
made sense to me
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post #5626 of 38141
Hey Aura, what power tubes are those?
Not bad at all...
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Not bad at all...
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post #5627 of 38141
currently using a set of Skullcandy smokin' buds. Does that count...LOL
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post #5628 of 38141
Quote:
Originally Posted by soloz2 View Post
made sense to me
Glad to hear I didn't confuse everyone . Seriously though, it was quite an experience to take an amp apart and really learn about some of what lies inside the chassis. The little extra knowledge I gained was alone worth the bit of work. I suspect DIY is in my forecast this summer.

Quote:
Originally Posted by not2bad View Post
Hey Aura, what power tubes are those?
Power tubes (two in the back with silver base) are 41PS, driver tubes in front are 1K2, which is a better version of the 1B2 apparently. Both are fairly obscure tubes, finding spares might take some work on my part.
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post #5629 of 38141
Quote:
Originally Posted by Aura View Post
Completed one of the priorities on my to-do list over winter break last night - successfully switched my Little Dot II from 220-240V to 110V so I could actually use it here in the States.

My friend's father is an electrical engineer, so he provided all of the help necessary. Essentially, and pardon me if this does not make sense since circuits are not my forte in the slightest, the four wires that comprise the power windings for the transformer were placed in a serial layout. All we needed to do was place them in parallel, which simply involved stripping the two wires leading to the power plug termination on the back of the amp and soldering them to the other two wires (having them correctly correspond to each other of course). This successfully stepped the amp down to 110V, which we confirmed through a few tests with a voltmeter. I didn't understand all of the intimate details of it, but my friend's dad told me that it is perfectly fine for normal use now. It was pretty fun to use his external transformer to slowly run up the voltage through the amp when we were still trying to figure out exactly what needed to be done to switch it.


It is alive . Sounds pretty good and will see a lot of use at school, as I only intend to bring this amp, my cdp, and the HD580 with me for the semester. The rest of the rig will stay safely at home, away from the chaos that is life in a dorm.
Quick question, i am very very noob when it comes to electrical, but if it was suited to 220-240v but you modded down to 110v, wont it not function as well as it would at its natvie 240v as it isnt receiving enough power or something?

Or does it have its own little transformer kinda thing which automatically would reduce the received 240 down to say 20v if thats all it actually required?

Please let me know i if i even in the right general direction lol
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post #5630 of 38141
Quote:
Originally Posted by jpw007 View Post
Quick question, i am very very noob when it comes to electrical, but if it was suited to 220-240v but you modded down to 110v, wont it not function as well as it would at its natvie 240v as it isnt receiving enough power or something?

Or does it have its own little transformer kinda thing which automatically would reduce the received 240 down to say 20v if thats all it actually required?

Please let me know i if i even in the right general direction lol
it's all in the way you wire the transformer. dual primary windings...

If you are familiar with speakers, especially car audio.

2 4ohm subwoofers wired in parallel will give your amp a 2ohm load.
2 4ohm subwoofers wired in series will give your amp a 8ohm load.

It's the same principle here. Many transformers can be used with either 120v or 240v mains power.
Wire the primary leads parallel for use in 120v situations or series for 240v.
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