ezDAC v.1.5 Builders Thread - Page 2

stonedowner · 16th March 2009, 09:12 PM

How do you calculate the gain?

ezkcdude · 16th March 2009, 09:16 PM

I made a simulation for the circuit a while back.

You can download it here. And you will need to download TINA-TI to run it.

TINA-TI

stonedowner · 17th March 2009, 05:25 PM

At last I found the problem. R12 the pesky little thing wasn't soldered properly. Resoldered the resistor and low and behold wonderful loud music. A great project. Thanks

Peter

ezkcdude · 17th March 2009, 05:28 PM

Well, that's good to hear (literally).

stonedowner · 23rd March 2009, 01:57 PM

What's the max output of the op amps. As configured the output is about 2V which is about the same as the output of a CD player. When connected to the CD input of an amp it produces the correct sound levels. What I would like to do is connect the output from the DAC to a stepped attenuator then to some power amps . The output from the op amps needs to be about 8V. Are they capable of this and if so,what value of resistors should I use. Or would I be better using a line amp.

ezkcdude · 23rd March 2009, 04:31 PM

Quote:

Originally posted by stonedowner
What's the max output of the op amps. As configured the output is about 2V which is about the same as the output of a CD player. When connected to the CD input of an amp it produces the correct sound levels. What I would like to do is connect the output from the DAC to a stepped attenuator then to some power amps . The output from the op amps needs to be about 8V. Are they capable of this and if so,what value of resistors should I use. Or would I be better using a line amp.

I think it's the current you mean?

Regardless, I use exactly this setup for my ezDAC: ezDAC->attenuators->Parasound amp.

I have used Endler attenuators for several years now, and am very happy with the results.

6h5c · 26th March 2009, 10:53 AM

Hi Evan,

Great to see everything is going well with the ezDAC 1.5!

Mine's from the first 1.5 batch, but I couldn't resist

Regards,

Ray

6h5c · 26th March 2009, 10:58 AM

Quote:

Originally posted by stonedowner
The output from the op amps needs to be about 8V. Are they capable of this and if so,what value of resistors should I use. Or would I be better using a line amp.

What kind of attenuator is that?? Or does the amp need 8V input? You can change the 2k0 resistors in the output stage to increase the output voltage, but if it has to be 8Vrms that will not be possible, that's too much for a +/- 12V supply

.

Ray

HaLo6 · 14th April 2009, 02:08 PM

I am getting sound out of both channels on the first hookup! ezDual is putting out perfect -13.8 and +13.8 on both leads. When playing back a song through it I am getting popping every so often in each channel, any idea what could cause that? I am still troubleshooting, (slowly, I have a final this week), just want to see if anyone could direct me down a path!

ezkcdude · 14th April 2009, 03:23 PM

Maybe there's a faulty connection to the output stage. Have you checked the solder joints are "clean"?

16th March 2009, 09:16 PM	#12
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	I made a simulation for the circuit a while back. You can download it here. And you will need to download TINA-TI to run it. TINA-TI __________________ He's not hi-fi, he's my stereo. ShinyMetal

17th March 2009, 05:28 PM	#14
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	Well, that's good to hear (literally). __________________ He's not hi-fi, he's my stereo. ShinyMetal

14th April 2009, 02:08 PM	#19
HaLo6 diyAudio Member Join Date: Dec 2008	It works...sort of... I am getting sound out of both channels on the first hookup! ezDual is putting out perfect -13.8 and +13.8 on both leads. When playing back a song through it I am getting popping every so often in each channel, any idea what could cause that? I am still troubleshooting, (slowly, I have a final this week), just want to see if anyone could direct me down a path!

14th April 2009, 03:23 PM	#20
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	Maybe there's a faulty connection to the output stage. Have you checked the solder joints are "clean"? __________________ He's not hi-fi, he's my stereo. ShinyMetal

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16th March 2009, 09:12 PM	#11
stonedowner diyAudio Member Join Date: Feb 2009	How do you calculate the gain?

17th March 2009, 05:25 PM	#13
stonedowner diyAudio Member Join Date: Feb 2009	At last I found the problem. R12 the pesky little thing wasn't soldered properly. Resoldered the resistor and low and behold wonderful loud music. A great project. Thanks Peter

23rd March 2009, 01:57 PM	#15
stonedowner diyAudio Member Join Date: Feb 2009	What's the max output of the op amps. As configured the output is about 2V which is about the same as the output of a CD player. When connected to the CD input of an amp it produces the correct sound levels. What I would like to do is connect the output from the DAC to a stepped attenuator then to some power amps . The output from the op amps needs to be about 8V. Are they capable of this and if so,what value of resistors should I use. Or would I be better using a line amp.

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