TDA1541A based NOS-USB-DAC schematic and pcb comments

dsavitsk · 9th March 2006, 04:47 PM

I am working on a NOS DAC using USB input and a TDA1541A chip. It is based on my own earlier TDA1543 based project but includes an async reclocker. The reclocker is from diyparadise. The board is designed so that the reclocker can easily be used, or ignored. I still need to add some pads such that the output filter can be jumpered. One thing that is not obvious is that the decoupling caps for the TDA1541a can have a pin spacing of 2mm, 5mm, or 7.5mm. This is to allow use of BG 0.1uF NX caps, wima polyprops, or siemens stacked film caps, or anything else that fits. Every other cap is mounted under the board. The opamp can be a dual, or there hould be room for a single to dual adapter to use opa627s or something.

Anyhow, any comments regarding schematic improvements and or layout changes would be greatly appreciated.

dsavitsk · 13th March 2006, 07:30 AM

Any comments before this gets made?

C1, C2, C3, and C4 are 1500uF FMs. C5 and C9 are 1000 and 680uF FMs. C55 and C6 are 47uF oscons. C54 is a 470pF wima, and all the rest of the squares (except C16 and C17 which are smaller) are 0.1uF wima MKPs. C57 is a 1uF tant. When caps appear to overlap (C18, C44, C45, every other 1541 decoupling cap, etc.), it means that one of them is mounted under the board.

9th March 2006, 04:47 PM	#1
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	TDA1541A based NOS-USB-DAC schematic and pcb comments I am working on a NOS DAC using USB input and a TDA1541A chip. It is based on my own earlier TDA1543 based project but includes an async reclocker. The reclocker is from diyparadise. The board is designed so that the reclocker can easily be used, or ignored. I still need to add some pads such that the output filter can be jumpered. One thing that is not obvious is that the decoupling caps for the TDA1541a can have a pin spacing of 2mm, 5mm, or 7.5mm. This is to allow use of BG 0.1uF NX caps, wima polyprops, or siemens stacked film caps, or anything else that fits. Every other cap is mounted under the board. The opamp can be a dual, or there hould be room for a single to dual adapter to use opa627s or something. Anyhow, any comments regarding schematic improvements and or layout changes would be greatly appreciated.

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13th March 2006, 07:30 AM	#2
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	Any comments before this gets made? C1, C2, C3, and C4 are 1500uF FMs. C5 and C9 are 1000 and 680uF FMs. C55 and C6 are 47uF oscons. C54 is a 470pF wima, and all the rest of the squares (except C16 and C17 which are smaller) are 0.1uF wima MKPs. C57 is a 1uF tant. When caps appear to overlap (C18, C44, C45, every other 1541 decoupling cap, etc.), it means that one of them is mounted under the board.