DAC build TDA1541A/SAA7220P/B *will take som time* - Page 32

Mayday · 2nd February 2012, 09:20 PM

This build is now about $5 short of $300...

But why complain, I've gotten so much fun DIY-stuff for free recently

Mayday · 8th February 2012, 09:02 AM

Build is not abandoned, waiting for some parts and to afford to order other parts.

Also I've been busy with this tube amp

I found the fault, a resistor that was broken(a 51R resistor responsible for poweringen one channel of the amp). Also I'll put a second on-off switch (on B+) so that I can switch on heaters, and then 20-30sec later switch on B+.
A manual softstart of sorts.

Mayday · 8th February 2012, 01:19 PM

Done

Not pretty, but it works, I'll make it pretty later when I've tested it w tubes in place. Enough OT, sorry.

Mayday · 10th February 2012, 10:57 AM

Got the CS8412 today.

Mayday · 15th February 2012, 09:01 AM

Got the PS's needed for the ECC86 output today.
24Vdc/1A and 6Vdc/1A.

Mayday · 08:57 PM

I've ordered a custom transformer for the DAC.
It's a toroid 60VA 230V primary.
Secondaries:
0-9Vac 1A
0-15Vac 1A
16-0-16Vac 1A

A picture of a friends transformer from the same company that's making mine.

This way I get away with using one transformer and it was actually the cheapest option.

This leaves room for a copper "wall" between transformer and DAC (and later tube output).

Mayday · 18th February 2012, 08:50 PM

Could someone please give me the search words for ebay or link me to a place where I can get a dip socket with the right dimensions that can be modified to be a TCXO-socket(cut to size and remove excess pins I guess). I want this in part to be able to swap/upgrade TCXO and also to change them in time as they age.

Mayday · 18th February 2012, 09:40 PM

With transformer the total so far comes to $387.

Still left to buy:
TCXO( price depends on which I chose) and a top for the enclosure (15usd)

Mayday · 19th February 2012, 10:06 AM

I have 4pcs OPA604 and 2pcs NE5534.

I'm thinking of putting the entire thing together when I get the transformer and TCXO using OPA604 for I/V and Buffer/Filtering.

Listen to the dac this way for a while before putting in the ECC86 outputstage.

Will this do as a TCXO-socket? Either breaking of 4 pins or two rows and removing unused pins(this approach would make for a more stable socket).

Mayday · 21st February 2012, 12:51 AM

The above and also 1ppm low jitter Valab TCXO ordered.

2nd February 2012, 09:20 PM	#311
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	This build is now about $5 short of $300... But why complain, I've gotten so much fun DIY-stuff for free recently __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

8th February 2012, 09:02 AM	#312
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Build is not abandoned, waiting for some parts and to afford to order other parts. Also I've been busy with this tube amp I found the fault, a resistor that was broken(a 51R resistor responsible for poweringen one channel of the amp). Also I'll put a second on-off switch (on B+) so that I can switch on heaters, and then 20-30sec later switch on B+. A manual softstart of sorts. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

8th February 2012, 01:19 PM	#313
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Done Not pretty, but it works, I'll make it pretty later when I've tested it w tubes in place. Enough OT, sorry. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

10th February 2012, 10:57 AM	#314
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Got the CS8412 today. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

15th February 2012, 09:01 AM	#315
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Got the PS's needed for the ECC86 output today. 24Vdc/1A and 6Vdc/1A. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg


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18th February 2012, 08:40 PM	#316
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	I've ordered a custom transformer for the DAC. It's a toroid 60VA 230V primary. Secondaries: 0-9Vac 1A 0-15Vac 1A 16-0-16Vac 1A A picture of a friends transformer from the same company that's making mine. This way I get away with using one transformer and it was actually the cheapest option. This leaves room for a copper "wall" between transformer and DAC (and later tube output). __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg Last edited by Mayday; 18th February 2012 at 08:57 PM.

18th February 2012, 08:50 PM	#317
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Could someone please give me the search words for ebay or link me to a place where I can get a dip socket with the right dimensions that can be modified to be a TCXO-socket(cut to size and remove excess pins I guess). I want this in part to be able to swap/upgrade TCXO and also to change them in time as they age. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

18th February 2012, 09:40 PM	#318
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	With transformer the total so far comes to $387. Still left to buy: TCXO( price depends on which I chose) and a top for the enclosure (15usd) __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

19th February 2012, 10:06 AM	#319
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	I have 4pcs OPA604 and 2pcs NE5534. I'm thinking of putting the entire thing together when I get the transformer and TCXO using OPA604 for I/V and Buffer/Filtering. Listen to the dac this way for a while before putting in the ECC86 outputstage. Will this do as a TCXO-socket? Either breaking of 4 pins or two rows and removing unused pins(this approach would make for a more stable socket). __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

21st February 2012, 12:51 AM	#320
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	The above and also 1ppm low jitter Valab TCXO ordered. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

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