TDA1541A Diy Pcb - "Distinction-1541 v2"

[ryanj]

Lovers of the TDA1541A -

"Distinction-1541 V1" Was a success thanks to the combined knowledge of the DIY community.

I start this thread for a place for myself to share what i'm working on with the TDA1541A, however unprofessional it may seem. I admit i'm certainly no expert. I just want to share my experiences with like minded people.

A new direction for the project has obviously been led by myself; wanting more from the TDA1541A - Especially after hearing just what V1 was capable of.

Design goals for v2:
-Simplicity
-Cost effective vs performance
-Attention to detail of Pcb design topology
-The use of the latest passive technology in SMD formats
-Seemless connection to other diy products (FIFO/PCM Pcbs)

The output stage for the TDA1541A is normally a personal choice for particular reasons so this part will be left out. I continue to use the "CEN Passive IV" with much enjoyment and success.

Attached to this post you will find a few pictures of the progress v2 has currently undergone. These pictures by no means represents what the finished product may or may not resemble - they simply show what i'm working on at the moment to attain the ultimate goal of the final product.

Please note that there are design compromises in every PCB design and this one is no different - all i'm doing is selecting the parts to the system I feel to be important based on simulation, practical testing and of course, most importantly - listening.

Ryan.


http://www.diyaudio.com/forums/group...ml#post4346268

[wlowes]

I will follow with great interest

[ryanj]

Thanks Walter.

Attached is a Simulation which has already been posted on v1 thread.

This is not the final schematics - just something i've been playing with.

Hopefully I'll have the time to build and experiment with this soon.

You will notice I've added inductance to simulate the PCB trace inductance - It's a bit crude but it does alter the results somewhat.

[Luke]

pushing my luck asking for a CEN stage board as well

[ryanj]

This might help. Should be easy to do on vero board - which is what I did in the beginning.

You could omit DAC -15, R8, and NCT 5k.

Jfets should be matched for Idss.

[ryanj]

Noise vs phase plot simulation for most recent posted schematics.

[Luke]

I think its the SEN I was interested in actually. but thanks. I don't get the social media thing. just don't do it.

[ryanj]

Originally Posted by Luke

Ryan is your design finalised for this? If so can you post a BOM please.

Hi Luke,

Ill answer here to keep the two threads separate.

I'm still very much in the design phase; plenty of work ahead before a prototype is ready for testing.

Recently I've been working on laying out the attenuation circuit.

I've decided it may be a better solution to add a reclocker instead of a signal buffer (needed to correctly drive the atten circuit) as its only one extra part - SMB connector for the master clock.

Image attached - Please note this is still work in progress.

[Luke]

Sorry I have thread crossover confusion. It looks really nice, it seems to be getting very SMD based now, getting out of my comfort zone. However, don't let that stop you, I suspect through hole days have another 5 years or so to go so maybe a good time to get some practice in. Its nice to see the odd post to let us know what your up to, we need something to talk about and critique One request would be to keep the SMD parts to 1206, nothing microscopic if at all possible.

[ryanj]

Just a bit of an update of where i'm at with the new design.

As you can see from the image attached, all the components have now been placed but not yet routed, i'm taking great care in the attention to detail - As we know the 1541 is very fussy with layout.

Still much work before I get a design ready to prototype and test. Thanks for everyone's patience.

Next steps will be to calculate heat dissipation techniques and how big to make the copper pours - the only challenging one will be the -15V with ~1W of heat to deal with. The CCS for the 3 supplies is only around 500mW so should not be an issue, might have to physically separate them further apart.

Still a few areas in the schematics that need to be looked over, and also need to add ground planes and power planes.