Need a schematic for Arcam Delta Black Box!

[JiggaD369]

Please can anyone send me one? This is the original DAC (not 5, 50, 500). It has a TDA1541A DAC chip. Thank you. I would really appreciate it.

[jean-paul]

It has TDA1541 without the A ( probably ). Watch your mailbox. I changed the thread title with the correct word for schematic.

[ash_dac]

Originally posted by JiggaD369
Please can anyone send me one? This is the original DAC (not 5, 50, 500). It has a TDA1541A DAC chip. Thank you. I would really appreciate it.

I have it but I think someone has sent it to you.

I haven't used my black box in a while because it sounds too bright to me.

Arcam Delta Black Box1 mods

What are you planning on doing to the black box?

[Ruach]

Hi Jigga,

You wrote to me earlier asking about Black Box mods. I have not done any mods to the Black Box. You may wish to check with the rest.

Ash_dac - I am surprised that you find the Black Box bright? Did you mod it?

[JiggaD369]

Originally posted by jean-paul
It has TDA1541 without the A ( probably ). Watch your mailbox. I changed the thread title with the correct word for schematic.

Hey Jean. Thank you very much for the manual. It's weird that mine does have the A on the 1541 chip. Maybe different units?

I'm planning on modding couple things on it. Maybe the caps in the PSU and the digital stage. Change out the lytics on the bypass. Maybe change out the diodes for MUR405's? Change the rca's (they seems little old to me) and change out the Rca input for a BNC input. Any input from you guys would be appreciated also.

Pics are up here:

http://www.villagephotos.com/pubbrow...der_id=1661429

[Ruach]

For a start, you can build a separate +5V for the 1541A. It is currently powered by a +6.2V shared power supply.

You can construct a new digital input section using a CS8414 chip

[JiggaD369]

Originally posted by Ruach
For a start, you can build a separate +5V for the 1541A. It is currently powered by a +6.2V shared power supply.

You can construct a new digital input section using a CS8414 chip

Hey Ruach. I'm just starting into this whole DIY thing. I have no clue how to do either of the two things you recommended. Any links or pics or advice you can provide?

[ash_dac]

Originally posted by Ruach
Hi Jigga,

You wrote to me earlier asking about Black Box mods. I have not done any mods to the Black Box. You may wish to check with the rest.

Ash_dac - I am surprised that you find the Black Box bright? Did you mod it?

Originally posted by Ruach
For a start, you can build a separate +5V for the 1541A. It is currently powered by a +6.2V shared power supply.

You can construct a new digital input section using a CS8414 chip

I haven't done much modding to it really. I decoupled saa7220, and tda1541a with oscon capacitors. Then I replaced the wire link with resistor to 'correct' 6.2V. I think it now measures 5.2v from memory . Also replaced tda1541a with tda1541a S1 grade. Corrected the inverted input receiver circuit so it works with my Philips cd723 / Marantz cd63.

I find the black box bright compared to my DPA dac's (bitstream). I'll listen again this week.

Yep I would go for correcting the PSU stage. Is the -15v to the relay the same line as to tda1541a? Might be worth building Jocko's Easy IV stage..