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DIY DIY amp club V2, Post your DIY amp here

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Leolabs
post Dec 17 2011, 03:40 PM

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From: Bukit Mertajam,Penang State


QUOTE(Iqbal_kakashi @ Dec 17 2011, 12:08 AM)
Hi everyone. I want to ask, can anyone from here replace the loose audio jacks of my iBasso T3D? It's very loose. having hard time with headphones some times.  icon_question.gif
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Understood your question...only can help u if u are from Penang...
Leolabs
post Dec 31 2011, 09:49 AM

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QUOTE(limhongwoon @ Dec 30 2011, 06:56 PM)
Hi everyone , anyone know where to buy 18AWG Wire ?
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Jalan Kampung Benggali @ Butterworth

or

Destiny Electronic Centre @ Sunway Tunas branch



This post has been edited by Leolabs: Dec 31 2011, 09:54 AM
Leolabs
post Feb 3 2012, 04:35 PM

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QUOTE(nekatrall @ Feb 2 2012, 11:32 PM)
user posted image
user posted image
finally finished this
biggrin.gif hahaha shiok
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Me already finished 5 units last December.... tongue.gif
Leolabs
post Feb 4 2012, 05:11 PM

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QUOTE(nekatrall @ Feb 4 2012, 07:01 AM)
u finished 5 i no time mah
hahaha do for fun last december i made ssmh, cmoy and recabled es7 and made a cable for hifiman he6
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What's your next project then??? drool.gif
Leolabs
post Mar 19 2012, 10:32 AM

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QUOTE(BanG_DeaD @ Mar 17 2012, 03:10 PM)
i need help  blush.gif
My new Cmoy is producing great sounds but when i measure the dc offset, i get about 90mV on the right and about 5mV on the left.. What should i do?  cry.gif
Btw, the cmoy has no volume control and is at max volume (gain 6).. Using WIMA 1uf input caps..
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Check the input to ground resistor OR replace the OPAMP and see....
Leolabs
post Mar 19 2012, 08:47 PM

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QUOTE(LittleGhost @ Mar 19 2012, 06:16 PM)
http://s160.photobucket.com/albums/t175/oo...nt=PICT1624.jpg

Ahhh cmoys, the time when I was so young and filled with spirit and motivation.

Here's an old picture of my cmoy. biggrin.gif

EDIT: For those who are now playing with point to point builds, I'm currently forced into building a simple dual regulated PSU for my final year project. Will share the layout and pics later.
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Remind me of my point-to-point LM3875 gainclone....now both units (as I have build 2 units) working at my friend's place and my friend's friend's place.... tongue.gif
Leolabs
post Mar 19 2012, 10:25 PM

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QUOTE(totally_skint @ Mar 19 2012, 09:42 PM)
Kena pinjam and never returned? tongue.gif
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Biasalah.... tongue.gif

Anyway,got free time going to rebuild again.... rclxms.gif
Leolabs
post Apr 30 2012, 03:27 PM

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QUOTE(mrsu @ Apr 29 2012, 12:40 AM)
Hi,if i want to build up a budget amp with good output,anyone has the diagram of the circuit and suggest to me which DIY one is nice?

And where should i get those DIY thingy? any reliable online shop to start with?

Thanks ya, I always wish to make a head amp myself,hope someone here willing to help wink.gif
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Discrete or IC based??? brows.gif
Leolabs
post May 21 2012, 04:31 PM

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QUOTE(cba5566 @ May 21 2012, 09:00 AM)
What i can say is building from "salvage".

As i know musical fidelity x-10d don't use 7812 voltage regulator in the

power supply section....but the internet x-10d schematic used it.

Can someone confirm about this...
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It doesn't use for the amplification section BUT the filament section....
Leolabs
post Sep 14 2012, 09:22 AM

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QUOTE(LittleGhost @ Sep 5 2012, 07:59 PM)
Try to use a mix of both, like I usually do.

Sometimes RS has parts E14 does not. Sometimes RS is cheaper, sometimes E14 is cheaper.
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E14 usually ask for order above RM150 for free shipping....BUT this month (September) they got free shipping for any amount of ONLINE order.... rclxms.gif
Leolabs
post Sep 14 2012, 11:59 PM

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From: Bukit Mertajam,Penang State


QUOTE(zy_xcup @ Sep 14 2012, 08:11 PM)
anyone building NwAvGuy O2 amp? i was thinking of building one but omitting the battery and changing it to powered one.. is it a good idea?
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QUOTE(LittleGhost @ Sep 14 2012, 11:30 PM)
why not?

Though the addition of the battery circuit is very minimal in terms of cost. More likely insignificant.
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But one thing for sure,using battery sound better than using AC adapter only,due to the filtering circuit...... tongue.gif
Leolabs
post Sep 15 2012, 09:44 AM

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QUOTE(zy_xcup @ Sep 15 2012, 09:26 AM)
but to change battery when its low is quite troublesome after a while.. but maybe i'm mistaken..

i've got the part list for the amp.. thinking of testing it first on breadboard..

i'm pretty much a beginner in this area..
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That's why it got charging circuit for rechargeable battery
Leolabs
post Oct 4 2012, 10:58 PM

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QUOTE(tanhks @ Oct 4 2012, 03:55 AM)
Wanted to ask about the electronic magazine that has article about DIY power amp.

Anyone can recommend some good electronic magazine (can be English or Chinese)?

20 years ago i used to buy those Hong Kong's electronic magazine but now those magazine seldom talk about DIY power amp.
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QUOTE(LittleGhost @ Oct 4 2012, 08:51 AM)
we use the internet now.

http://www.diyaudio.com
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Or HIFIDIY论坛 tongue.gif
Leolabs
post Oct 21 2012, 10:54 PM

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QUOTE(LittleGhost @ Oct 21 2012, 09:30 PM)
Not sure if anyone's interested, but...

user posted image

Teaser on a fully Discrete Amplifier I'm working on.
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Tektronix DSO...Noratel toroid.... rclxms.gif

Your amp drive phones or speaker??? hmm.gif
Leolabs
post Oct 22 2012, 11:15 AM

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QUOTE(LittleGhost @ Oct 21 2012, 11:44 PM)
Got the first half right laugh.gif, not Noratel Toroid though. Too poor to afford one.

My amp is meant for pre-amp/headphone use.

Features:
-folded cascode (yes fully discrete)
-push pull darlington output stage (50mA)
-Fully Class A
Glad you're interested biggrin.gif

It is designed for headphones. The PSU and the amp itself is designed from scratch. PSU is Linear Tech's high spec LT317 and LT337 (not to be confused with LM317/337). biggrin.gif

Going to post more details after I'm done with the stress tests and benchmarks.
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Then where's your amp that drive speaker??? tongue.gif
Leolabs
post Oct 22 2012, 01:21 PM

On my way
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QUOTE(LittleGhost @ Oct 22 2012, 11:16 AM)
no money yet la.

Using cheap cheap Class D atm.

plan to design and build a LATERAL MOSFET based Class AB amp in the future for my Full Range drivers.
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Build a Gainclone lah,also cheap cheap nia.... tongue.gif
Leolabs
post Oct 24 2012, 02:26 PM

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QUOTE(LittleGhost @ Oct 24 2012, 10:51 AM)
Last time I jelly empire23 as well.

He was one of the first amongst us old /audiophile/ diy kakis to own one.
If you're gonna be doing stuffs like this, you'd have to invest in one set sooner or later. There's no way out of this sad.gif

I'm saving money for an audio analyzer as well. Costs like at least 5k USD per unit. sad.gif
Audio engineering sucks even more blood money than actual audiophilia.
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Audio Prism or Audio Precision??? rclxms.gif
Leolabs
post Oct 24 2012, 02:55 PM

On my way
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Senior Member
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From: Bukit Mertajam,Penang State


QUOTE(LittleGhost @ Oct 24 2012, 02:32 PM)
Want audio precision but seems like takes a whole lot longer to save to get one sad.gif
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Enough to buy a car already......

But if kena lottery,can buy a Audio Precision and a Lecroy..... tongue.gif
Leolabs
post Oct 24 2012, 03:20 PM

On my way
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Senior Member
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QUOTE(LittleGhost @ Oct 24 2012, 03:02 PM)
Or, be a virgin forever, don't buy a car, acquire AP.
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LOL.....

I'm still waiting for your amplifier that drive speakers.... tongue.gif
Leolabs
post Nov 2 2012, 07:59 PM

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From: Bukit Mertajam,Penang State


QUOTE(stan001 @ Nov 2 2012, 11:09 AM)
Found this see-thru "crystal" CMoy amp with instructions on how to build it...

http://runawaybrainz.blogspot.com/2012/04/...-headphone.html

user posted image
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Point to point wiring I did on the Gainclone but not on any CMOY before.... tongue.gif

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