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Class D Switching Power Amplifiers and Power D/A conversion

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Old 13th August 2010, 11:38 AM   #591
sendler is offline sendler  United States
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Join Date: Aug 2004
Location: ny
Default Opamps

I don't have any opamps in my system right now either unless you count the various digital and amp chips.
.
I think the solutions to your problems are to use separate power supplies or batteries for each component, and then compare the tube buffer to some other volume control options and keep what ever sounds best.
Quote:
Originally Posted by TheDealer View Post
Why not ? Is it more technical or taste depended ? In pre stage for the most poweramps it makes sense but in the other hand I donīt see any urgent need for at least smooth Tripaths.
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And guys excuse me if I am crossing a bit off topic at moment ...
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Old 13th August 2010, 01:31 PM   #592
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Quote:
Originally Posted by dubai2000 View Post
@hifimediy
Cool project......I shall stay tuned. When do you think the new board will be available?
Board will arrived next week, but many works need to do before "available".

Quote:
Originally Posted by alkasar View Post
nice project. all-in-one
don't you want to start a dedicated topic for this ?
I'm just used to come here.
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Old 15th August 2010, 03:12 AM   #593
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Quote:
Originally Posted by hifimediy View Post
Board will arrived next week, but many works need to do before "available".

I'm just used to come here.
A new topic might be preferable, since this DDX board you're developing is a substantially different product and it isn't a "TK2050 board," as the name implies. You'd probably get more attention and feedback from a new discussion anyway, since these conversations can get unwieldy after the first fifty pages or so.
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Old 15th August 2010, 07:57 AM   #594
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Thank you.
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Old 16th August 2010, 05:42 AM   #595
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Hello to all. This is my first post on this board.
I'm just getting into the DIY Amp community so please , kid gloves...lol

I am very interested in building my first amp with Hifimediy's V2.0 2x100W board. I have spent the last 2 weeks researching which on the many many many boards from as many manufacturers to get started with and this seems to be the one. It will be driving a pair of Reference3A MM speakers.
I'm looking for if at all possible Audiophile audio quality, stability & ease of construction since this will be my first amp build.

2 things I want to do initially & I need feedback as to how straight forward this will be.

1)I will be relocating the potentiometer as I want to put the board in a nice case with a volume knob. It's present location may present a problem with case mounting with the case I have available unless I link the knob & the boards volume potentiometer via a rod of some kind as is the case with my Mission Cyrus retail amp that sits in my audio system presently.

2) I want to replace the signal input plug & wire the input directly to rca input jacks on the rear of the case.

Really DIY baby questions but I have to start somewhere.
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Old 16th August 2010, 06:07 AM   #596
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Your DDX project sounds awesome, but yeah, a new thread would be nice. I'd be very, very interested in this.
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Old 16th August 2010, 12:11 PM   #597
zog666 is offline zog666  Australia
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Join Date: May 2009
Quote:
Originally Posted by hifimediy View Post
Why not use 20000uF?
35V is enough for your usage.
OK, implemented this.. of course hard to quantify but I think the amp can pour out a lot more definate bass now!
But then I know I've increased the capacitance from 4700uF to 24700uF.

Here is a picture of my fairly basic enclosure setup (electronics store instrument enclosure):

Click the image to open in full size.


its the enclosure (and extra capacitors + transformer) repurposed from my dead YuanJing module

All fits very nicely. I'm using a bamboo chopstick stuck on with hotglue as the rail to attach the extra caps to.

Now I'm really enjoying the amp.. it's very quiet, very clear, and can put out quite heavy bass with my econowave speakers.

good stuff!
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Old 16th August 2010, 12:55 PM   #598
alkasar is offline alkasar  France
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Join Date: Jan 2009
Location: near Paris, France
Quote:
Originally Posted by kingnubian View Post
Hello to all. This is my first post on this board.
I'm just getting into the DIY Amp community so please , kid gloves...lol

I am very interested in building my first amp with Hifimediy's V2.0 2x100W board. I have spent the last 2 weeks researching which on the many many many boards from as many manufacturers to get started with and this seems to be the one. It will be driving a pair of Reference3A MM speakers.
I'm looking for if at all possible Audiophile audio quality, stability & ease of construction since this will be my first amp build.

2 things I want to do initially & I need feedback as to how straight forward this will be.

1)I will be relocating the potentiometer as I want to put the board in a nice case with a volume knob. It's present location may present a problem with case mounting with the case I have available unless I link the knob & the boards volume potentiometer via a rod of some kind as is the case with my Mission Cyrus retail amp that sits in my audio system presently.

2) I want to replace the signal input plug & wire the input directly to rca input jacks on the rear of the case.

Really DIY baby questions but I have to start somewhere.
This will be straight forward. Unsolder the onboard pot, relocate where you want, but preferably not too far, and use shielded wire. I would replace the provided pot by an ALPS, but this might be a minor improvement.

For input signal: in the box comes a 20cm cable as shwown on hifimediy.com web site. There is also in the box an additional molex plug with no cable, so that you can build your own cable if you wish. You can also solder directly to the board pins if you don't want to use molex plug. Last alternative is to purchase the already made 4USD cable with two RCA provided on the website.
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Old 16th August 2010, 03:58 PM   #599
TCx is offline TCx  Czech Republic
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Join Date: Apr 2010
Hi all, if I wanted to use TK2050 v.1.1b module (without pot) with external pot, what value would you recommend? Can I use 10kOhm? Or is higher value (like 50kOhm) better? Thanks.
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Old 16th August 2010, 05:03 PM   #600
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Join Date: Aug 2010
Quote:
Originally Posted by alkasar View Post
This will be straight forward. Unsolder the onboard pot, relocate where you want, but preferably not too far, and use shielded wire. I would replace the provided pot by an ALPS, but this might be a minor improvement.

For input signal: in the box comes a 20cm cable as shwown on hifimediy.com web site. There is also in the box an additional molex plug with no cable, so that you can build your own cable if you wish. You can also solder directly to the board pins if you don't want to use molex plug. Last alternative is to purchase the already made 4USD cable with two RCA provided on the website.
Thanks for the great answers.

I'll probably initially going with a toroidal transformer (Antek - AN-4228) for power.

Any pitfalls going this route?
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