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Old 25th January 2013, 05:46 PM   #1
defi is offline defi  United States
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Default Pimeta V2 or O2?

Hi, I'm looking towards my second diy amp project. As usual, cmoy was the first, but now I'm looking for something with a little more punch. I've been looking at the 50-100$ diy range that has the ability to recharge/run on wall plug with two batteries. This has left me with the options of tangent's Pimeta v2 and nwavguy's Objective2. I haven't been able to find information on the notable differences of both and also comparing the two.

My main needs are swappable opamps and option to recharge/use on batteries or wall plug. I don't need them to be portable. The two amps cover these. Could someone help me decide? Thank you.
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Old 30th January 2013, 03:35 AM   #2
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Go for O2, because
- Of the shelf, readily available, thru hole parts(no SMD or boutique parts used)
- Simple yet good objective design.
- Near zero ohm o/p impedance (0.5 Ohms)
- Drives 16-600 Ohms h/p with o/p 7V rms /200mA max with adj. gain
- Employs real gnd (No shaky virtual gnd or 3-ch. gnd "concept")
- Flat audio response - no coloration.

I can go on & on...
I won't list any flaws of pimeta as I don't want to start any "War Of Words"

You can get kits/finished O2 from many good reliable sources like jtktam(audio poutine), swalter(Head n Hifi) or epiphany acoustics right here at diyaudio (also lots of help from fellow diyaudio members, especially moders like agdr).
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Last edited by availlyrics; 30th January 2013 at 03:37 AM.
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Old 30th January 2013, 01:11 PM   #3
Limp is offline Limp  Norway
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Pimeta is one of those infamous 3-channel designs, isn't it? I'd stay away from those.
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Old 30th January 2013, 01:16 PM   #4
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Quote:
Originally Posted by Limp View Post
Pimeta is one of those infamous 3-channel designs, isn't it? I'd stay away from those.
Did you ever heard one or are you just recommending something based on something you read somewhere?

Could you state the reasons for what you wrote?
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Old 30th January 2013, 01:26 PM   #5
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I've owned a Mini3 (also a 3-channel design) a few years ago. Man, was that a disappointment and a waste of money.
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Old 30th January 2013, 01:29 PM   #6
Limp is offline Limp  Norway
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Quote:
Originally Posted by MASantos View Post
Did you ever heard one or are you just recommending something based on something you read somewhere?

Could you state the reasons for what you wrote?
No, never heard a PPA/Pimeta, and I have never commented on how it sounds.
The design is flawed, that's all. You do not need me to explain how, it has been done in depth by others, much more qualified than me.
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Old 30th January 2013, 06:08 PM   #7
adydula is offline adydula  United States
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you can not go wrong with the O2....built several amps, including (2) O2's...its a wonderful design, engineered and is totally transparent....low output impedance etc...

would not hesitate to recommend this as a DIY project.

Good luck
Alex
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Old 30th January 2013, 10:28 PM   #8
jcx is offline jcx  United States
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the distinction between AMB, head-fi's faddish "3 channel" and a active split supply is very small on the pcb

its usually easy to cut and jump (or lift a pin or 2) to have a single copper path from input singal gnd to output gnd

if the project already has a dual polarity supply you can just not stuff the 3rd "gnd channel" - again add a jumper or 2
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Old 1st February 2013, 04:06 AM   #9
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Quote:
Originally Posted by MASantos View Post
Did you ever heard one or are you just recommending something based on something you read somewhere?

Could you state the reasons for what you wrote?
NwAvGuy: Virtual Grounds & 3 Channel Amps

I highly recommend reading the whole blog (incl. comments)
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