* The DIY Audio Thread *

gurusan · 25 Oct 2008 at 18:51

Ok well I've just ordered 2 new mosfets...unsure of what to do about the DAC though.

gurusan · 26 Oct 2008 at 09:57

So I'm looking for a suitable replacement transformer for the DAC. Can anyone recommend one that is not very expensive, but won't fail like the last one did?

adamau5 · 27 Oct 2008 at 12:57

hello.

First, the starving student, you put 48v through the heaters of the valve. It may be ok, or you may have blown the filaments, the fet will definately need replacing.

second, the transformer - what size fuse did you have in there?

gurusan · 27 Oct 2008 at 17:31

Hi...I ordered the new mosfets...just to be clear... 1,2 and 3 correspond with Gate, Drain, and Source respectively, right?

As for the transformer....I did not have a fuse :/ Not good, I know. What size should I put in, I don't even know where to put it..the IEC socket?

http://www.pmillett.com/images/starvi1.gif

No hot linking

J1234 · 27 Oct 2008 at 17:32

How hard is it to make a DAC and amp for headphones? Especially for someone that has never done something like this before?

I was going to buy a Fubar III USB DAC and headphone amp.. But fancy the challenge of building one. I have no idea where to start though. Is there any guides out there for complete noobs?

Also, where do you buy all the bits from and cases?

adamau5 · 27 Oct 2008 at 17:56

fuse goes on the hot line, just after the IEC.

for the dac i would estimate about 150 to 200 ma.

adamau5 · 27 Oct 2008 at 17:56

Justin, if you have never done any amp building or basic soldering then you should start with building a CMOY. google it and there are a few guides.

gurusan · 27 Oct 2008 at 17:58

ah ok will pick one up for sure this time. thanks

J1234 · 27 Oct 2008 at 18:45

Is there someone here that I can add on MSN for some advice about the CMOY?

adamau5 · 27 Oct 2008 at 18:49

justin, more info here than you can shake a stick at.

http://tangentsoft.net/audio/cmoy-tutorial/

J1234 · 27 Oct 2008 at 18:53

Looking there at the moment

Founder_film · 27 Oct 2008 at 19:48

Justin said:
Looking there at the moment

The tangentsoft CMoy tutorial is ideal for beginners. I built one with the standard components in the tutorial at it was ace. Great thing is once you have done your first you can tinker and make better and better amps. I had a good level of electronics experience from uni and found it dead easy to make and the tutorial as really well written. You will have questions I am sure though

p4radox · 27 Oct 2008 at 20:23

Ah Justin, was it you that added me the other day? I'm not on msn that often, but I'll be on tonight for a bit.

J1234 · 27 Oct 2008 at 20:29

I didn't add you, no. But will do now!

Right, I want to add a power supply to the CMOY instead of using batteries. How do I go about doing this?

I read this on tangentsodt:

Most single-voltage DC power supplies use a barrel connector of some sort. The inner part can be positive or negative. There is no standard, so you'll have to use your voltmeter to find out which it is. You can then use your ohmmeter to find out which lugs go to which parts of the plug. This will tell you where to run the V+ and V- wires from the amp board. For a simple 2-lug DC power jack, that's all you need to know to hook it up.

Is it really as easy as that?

What type/voltage etc would I need. Bit confused by it.

stew007 · 28 Oct 2008 at 18:26

my very own hand made DIY Morel based speakers

http://gallery11185.fotopic.net/

Founder_film · 28 Oct 2008 at 18:37

Justin said:
I didn't add you, no. But will do now!

Right, I want to add a power supply to the CMOY instead of using batteries. How do I go about doing this?

I read this on tangentsodt:

Is it really as easy as that?

What type/voltage etc would I need. Bit confused by it.

Basically the jack for the power supply replaces the batteries in the power supply schematic. You need a power supply that outputs 9 or 18 V DC. Its like the ones you have for routers where its just a power brick that plugs into the wall socket.

adamau5 · 28 Oct 2008 at 20:06

Stew007 - awesome job on the speakers. look super pro - how about the sound? happy?

gurusan · 28 Oct 2008 at 20:43

Quick question...what is this thing?

p4radox · 28 Oct 2008 at 20:50

Dunno. Diode or choke would be my guess.

p4radox · 28 Oct 2008 at 20:55

http://www.simister.com/temp/dac_cd.jpg

According to the PSU section of that schematic, it might be a zener diode. (D2)

*** The DIY Audio Thread ***

* The DIY Audio Thread *