Class D Amplifiers

Rega Amplifiers
captrajesh said:
Listened to Iron Maiden, Deep Purple. Sounds sexy.

As mentioned before, this amp is great in sweetening the mids, positioning of the instruments, spot on.

The transient peaks an decay, worthy rival to tube amps.

What it lacks I find is in slam & width of sound stage.Depth is now palpable but I've not been able to expand the sound stage.:sad:

Donno if it is the speaker prob?:confused:
Click to expand...

Amp may need to be burned in - if you believe that.
 
keith_correa said:
Amp may need to be burned in - if you believe that.
Click to expand...

Donno how much of burning in is required.:rolleyes:

For the slam, I've read that the PassDIY B1 Buffer pre amp will do wonders with their JFETS. I'm planning to get the kit. Lets see.

Edit:
One good news, one not so good news & one bad news.

Good news first, the toroid has arrived.:)

Not so good news: It weighs 4.1 kg:indifferent14:

Now the bad news: It doesn't provide a -35 tap. So I cant use it for this amp.:annoyed:

And the whole point to get :mad: is: I'm myself to blame.:mad::mad::mad:

I mentioned that I need 35V @ secondary, I should've said 35-0-35 @ secondary.

Don't know what to do with it now.
 
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captrajesh said:
One good news, one not so good news & one bad news.

Good news first, the toroid has arrived.:)

Not so good news: It weighs 4.1 kg:indifferent14:

Now the bad news: It doesn't provide a -35 tap. So I cant use it for this amp.:annoyed:

And the whole point to get :mad: is: I'm myself to blame.:mad::mad::mad:

I mentioned that I need 35V @ secondary, I should've said 35-0-35 @ secondary.

Don't know what to do with it now.
Click to expand...

you can change the rectifier to a bridge type and use the tfr, get a bridge rectifier module or use discrete diodes
 
borg said:
you can change the rectifier to a bridge type and use the tfr, get a bridge rectifier module or use discrete diodes
Click to expand...

Hi Borg

Thanks but the power supply already has a bridge rectifier. It has three pins, one each for +35, 0 & -35 which lead to the bridge rectifier and the caps.

Someone suggested that the tranny can be used for Class A amp as it doesn't need -35 tap. Is this true?
 
I thought EIs are bulkier and heavier than Toroids ...

Hmmm check with the electronics experts , I have no clue about what kind of acrobatics will make it useable ...
 
captrajesh said:
Hi Borg

Thanks but the power supply already has a bridge rectifier. It has three pins, one each for +35, 0 & -35 which lead to the bridge rectifier and the caps.

Someone suggested that the tranny can be used for Class A amp as it doesn't need -35 tap. Is this true?
Click to expand...

Oh, you need a dual supply, that also possible with this by using a doubler configuration, will have to use bigger caps to reduce ripple. you should be able to find the schematic on net

gobble said:
I thought EIs are bulkier and heavier than Toroids ...

Hmmm check with the electronics experts , I have no clue about what kind of acrobatics will make it useable ...
Click to expand...

Toroid shape is one of the most electromagnetically efficient shape to make a tfr, the core material available is the best grade (min losses) so it should be possible to make a lighter tfr ,if it is heavier it the EI and toroid may not be of equivalent specs
 
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borg said:
Toroid shape is one of the most electromagnetically efficient shape to make a tfr, the core material available is the best grade (min losses) so it should be possible to make a lighter tfr ,if it is heavier it the EI and toroid may not be of equivalent specs
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Even i think the transformer is overweighted...
My toroidal is a 20 amps 22-0-22 config. It weighs around 5 kg only..
3000+ rupees is also very high for this spec.
In this case its only a 0.4 amps 35v transformer:rolleyes:
In your case center tap is a must.. or else, u may face grounding issues.

Don't worry sir, thats all in the game...
I know how much money i have burnt while i was designing my 8-channel amp for my X-fi Platinum Sound Card:D:D:D
So, many IC's blowed up, redesigned and fabricated PCB's hell a lot of times due to ground looping issues.
All this u must consider as a thrill; in the end one day u'll be like :yahoo::yahoo:
 
borg said:
Oh, you need a dual supply, that also possible with this by using a doubler configuration, will have to use bigger caps to reduce ripple. you should be able to find the schematic on net
Click to expand...

Thank you very much for the info Borg, will check that out.
Edit:
Checked with Miracle guys, they are suggesting that I connect the +35 lead parallelly to the +35 / -35 terminals of the power supply and connect the '0' tap to the neutral.

Any DIY masters help me please:sos:

Hope Cranky was around.:rolleyes:
 
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Hi!
In class D, D stands for Dusty Vawter groused.It is actually an analog switching amplifier that modulate the output of the digital input..:)
 
pragyapriya said:
Hi!
In class D, D stands for Dusty Vawter groused.It is actually an analog switching amplifier that modulate the output of the digital input..:)
Click to expand...

Dusty Vawter is the name of the person that owns Channel Islands Audio. "Dusty Vawter groused" means "Dusty Vawter grumbled". In context of the Stereophile article which mentions "Dusty Vawter groused", Dusty was grumbling to the author of that article that the D in Class D did not mean Digital.
The D in Class D does not stand for the D in Dusty if that is indeed what you are thinking :lol:
 
Reviving an old thread. I re-visited the amp and mated it to my AP PM1 to drive both AP MS101 and the Cadence Aristas. The class D amp is such seductive midrange and beaten the AP AM1 Power amp so hollow on that account that I want to see how it fares vis-a-vis a tube amp. Looking forward Rajiv. Ball is in your court.;)

captrajesh said:
Will come back & tie up with Bala & Rajiv to see how this amp fares with their speakers.
Click to expand...

Rajiv said:
Looking forward to it.
Click to expand...
 
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