Hifimediy DAA1853 DAC - AD1853/CS8416/OPA2134

[tamphist]

I don't quite understand FM lost signal, may be you can set it to be 4x mode and have a try.
Yes, hope that not trouble you

While I'm listening a FM radio station, at 101 MHz, and
when I have 44khz input to dac, interference from DAC
fills radio with noise. But with 48khz input this does not happen.

Just a strange new phenomena for me

 

[JensH]

@tamphist

It seems like there is some radiation from the DAC clock. I assume the DAC is using a system clock of 256 x the sample rate. If so, the 9th harmonic of this clock will be close to the 101MHz (actually 101.6064MHz) when using a sample rate of 44.1kHz. This may very well interfere with the radio signal.

At 48kHz sampling the odd harmonics will be outside the FM band.

 

[hifimediy]

While I'm listening a FM radio station, at 101 MHz, and
when I have 44khz input to dac, interference from DAC
fills radio with noise. But with 48khz input this does not happen.

Just a strange new phenomena for me

hmm, so did you put the board in a metal case or not?

 

[tamphist]

hmm, so did you put the board in a metal case or not?

It's in an aluminium case.
But aluminium of course is not a magnetic shield.
I could wrap the board in EMI Shielding Foil, but naahh..

 

[Centvrion]

But aluminium of course is not a magnetic shield.
I/QUOTE]

Put your mobile in a metal "butter cookies" box, then call it...it doesn't matter which metal... what matter is that the material is conductive.

However try to link the aluminium case to the ground, to dramatically improve shielding (see for example on the right of this picture).

Hope this helps

 

[oon_the_kid]

Hi Hifimediy,

I bought this DAC from you but I am embarrased to say I have not hook it up.

Trying to understand one thing. If I were to short the jumpers I would get either 2X or 4X oversampling. If I were to leave both open, does that mean the original input from my CDplayer will be converted to analogue at 44.1KHz as an non-OS DAC or will it be converted to 48KHz before conversion?

Does thisimply that this is actually a non-OS DAC that can be updsample if you want to?

Oon

 

[hifimediy]

Hi Hifimediy,

I bought this DAC from you but I am embarrased to say I have not hook it up.

Trying to understand one thing. If I were to short the jumpers I would get either 2X or 4X oversampling. If I were to leave both open, does that mean the original input from my CDplayer will be converted to analogue at 44.1KHz as an non-OS DAC or will it be converted to 48KHz before conversion?

Does thisimply that this is actually a non-OS DAC that can be updsample if you want to?

Oon

Hi, on DAA1853, short the jumpers will put the logic to '1' and left open means '0', so you can check the state according to table below.

 

[reg66]

hi hifimediy, sorry for the complete noob question but...

i have hdd with flac files connected to logitech squeezbox touch via analogue at the moment. i want to use the optical out to this DAC. my flac collection is a mix of 44.1 and 96khz.

does this mean i can only play one or the other, according to jumper selection?
or does it mean that, if i had 44.1 configured on jumper, both 44.1 flacs and 96 flacs would play, but only at 44.1?

please avoid heavy technical language in response, as i say, i'm a noob and just getting into all this stuff. many thanks

 

[hifimediy]

hi, reg66.
Pls use the INT 4x mode (or set 4x jumper, and left 2x open).