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williamneo

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Posts posted by williamneo

  8. Posted · Report reply

    ok i have updated the cmoy amplifier instruction:

     

    Added: 10k dual pot onto part list 2

    added: R6 10k ohm 1/4W resistor onto part list 2

    added: R6 Resistor for power led and save current flow

     

    One last stuff I gonna add in is a Picture instruction on how to solder the green line jumper as commented by 1bit.

     

    I am very appreciate all your comment and all the question so that I will be able to add in to the instruction blog in order for many more ppl to understand easily, once again thank you guyz.

     

  9. Posted · Edited by williamneo · Report reply

    Yup! The volume control pot... hmmm... is there a value for the pot, eg 10K, 100K etc? Also... what's dual pod?

     

    Can share how you drilled the holes for the tin?

     

    Thanks!

    I use a single hole puncher brought from bookstore. http://williamneo.blogspot.com inside got a the picture of it under tools. the value of the pot is 10k. Dual pot has 6 pin and single has 3 pin. dual pot for stereo L/R channel while single only has mono channel either L or R.

  10. Posted · Report reply

    hmm i can't say for sure about battery life. never really test it proper.

    i'd say it's between 5 to 10 hours or probably longer.

     

    well the gain setting is up to you, when i first made it i used the standard part list (gain 2x) to drive my cheapo koss 100 ohm headphones and i felt unsatisfied. that's why i increase the gain. that time i haven't got my alesandro yet and therefore never had the chance to try the 2x gain on a lower impedance phones.

     

    cmoy2 can fit inside an altoids tin, but it's a pain to make the holes for the pot and jacks.

     

    I use single hole paper puncher which can purchase at book store, The size of the hole fit nicely to input, output, toggle on/off switch, Power led and pot. If you want to see how it look like i have the pic at my blog the tools section.

     

    regards

    william

    http://williamneo.blogspot.com

  11. Posted · Report reply

    Nice Job, correct me if I'm wrong but isn't there suppose to be a 10 KΩ 1/4W resistor between the LED and the +ve at step 4? You might wanna add that in cos I read somewhere on tangentsoft the LED will burn up if it's missing.

     

    Yup i didn't add the resistor there on my amp, i will update the page asap. In fact so far my led didn't burn up might be due to i am using 9v batt instead tangent is using 18v if i not wrong.

     

    yeah you really need the led resistor, if you don't put it in, the led will draw so much current that the battery won't last long. the resistor there will control the current.

     

    For 9v battery, the resistor's value can range from 560 to 10k ohm, depends on how bright you want the led to be. Try to use as high value as possible though.

     

    a little comment: you should probably add more detail on how to solder those jumper wires (the green links in your diagrams) i think beginners might get confused about this. Actual photos would be nice.

     

    another thing, metal film resistors (usually blue colored) would be more suitable for an amp. it's still quite cheap at 10 cents a piece iirc.

     

    i love the way you put pictures to describe the parts list. but looks like the actual audio jacks that you use is different from the picture.

     

    and the main point is that you give a nice layout that is easy to solder the jumper wires (no messy wire crossings)

     

    cool

     

    As for the led resistor i will update that on e blog. The comment regarding the jumper wires for real pic is abit hard for me my phone camera can't take very close shot it look blur, i will try to borrow a digit camera to actually take some real pic so that i can update it... thanks for e comment

     

    Nicely done indeed!

     

    One question though... What's the component part of the pot that you're using?

     

     

    Oh you mean the volume control pot i am using? For that i just buy those normal dual pot you can find at SLT.

  13. Posted · Report reply

    Good day everyone!

    My name is William, I understand that there is alot of people like me who isn't really good at electronic or had a hard time reading those schmatic diagram. So I have write up a blog on sharing how to build a cmoy amplifier by using picture of step by step tutorial. For those of you who interested please check my blog at http://www.williamneo.blogspot.com/. Hope this help! :)

     

    sincerely

    William Neo

     

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