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"Reference" TDA1541A DAC with I2S-BUS architecture

Surface Finish for future PCB´s

  • ENIG - Electroless Nickle/Immersion Gold

    Votes: 93 48.7%

  • Immersion Silver

    Votes: 54 28.3%

  • Immersion Tin

    Votes: 24 12.6%

  • OSP - Organic Solderability Preservatives

    Votes: 20 10.5%
  • Total voters
    191
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#325
Hi Oliver,

All leds are Green...

Transfer
Unlock
Non-Audio
Gen_flag

but this is also true even if nothing is being played.

If i unplug the coax cable from the back of the dac, then all lights are red...except for non-audio which is green.
 
#336
Malka07 said:
Oliver this is what im getting

Pin 28 = +4.90v
Pin 26 = -4.70v
Pin 15 = -14.85v
Click to expand...

Those TL431s are pretty inaccurate, with no way to adjust them in this configuration.

But you are getting voltages on the chip, so that's a good start.

When I had this problem, I was getting +5v digital to the X2, but not to the reclocker, due to the coil being broken so please check for voltage on the 74HC02 chips too. Pin 14 should be +5v ±1v. To find pin numbers, pin 1 is at the mark, or if no mark it is anticlockwise next to the indent or chip on the end. Then numbers count anticlockwise - so pin 14 is the last one you come to.
 
Last edited:
#338
LucasAdamson said:
Those TL431s are pretty inaccurate, with no way to adjust them in this configuration.

But you are getting voltages on the chip, so that's a good start.

When I had this problem, I was getting +5v digital to the X2, but not to the reclocker, due to the coil being broken so please check for voltage on the 74HC02 chips too. Pin 14 should be +5v ±1v. To find pin numbers, pin 1 is at the mark, or if no mark it is anticlockwise next to the chip on the end. Then numbers count anticlockwise - so pin 14 is the last one you come to.
Click to expand...

This are the Voltages im Getting Lucas.

An externally hosted image should be here but it was not working when we last tested it.


All other Voltages are 0v
 
#340
Malka07 said:
This are the Voltages im Getting Lucas.

An externally hosted image should be here but it was not working when we last tested it.


All other Voltages are 0v
Click to expand...

All voltages correct throughout then, measured at chips themselves. That 4.83v is pin 14, the VCC for that chip.

I see you have those tiny reclocker chips in place. Do you have any 74HC02 chips to throw in there, just in case? They're dirt cheap (30p each) and work well.

It does seem from what you've said that the data may not be reaching the TDA chip at all, indicating that the Twisted Pear is not set up properly, or the reclocker chip is not working.

Are your DAC boards v2.2 or v2.3. If v2.2, have you lifted the appropriate pins on the chips or removed the traces, as instructed by Oliver?
 
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