Tír Na HiFi

i am just returning to my shelved 1121 project. I put it on hold early last year in the hope that Nigel was going to attack his and give us mere mortals a guide on what to do but alas this has not happened. Has anyone modified one yet, on the lines of the mods made to the 1021? I'm comfortable with ...

i know development on this thread has mostly died (maybe all threads/forums) but i stumbled across some of these i got a while back to provide a differential clock signal for the dam for those of us that think the stock adjustable clock is probably not a great idea..... I have been holding off from...

smaller than i thought Mine is wired up with basic supply and has been running in for the last few days. Waiting to see what Nigel does before I start modding! I really don't want to trash this one. Interested to know where Nigel finds are the optimal points to inject the battery power supplies and...

I give up. I've triple checked everything and can find nothing amiss. I have tried using different firmware, with and without input isolators, and can not get anything on the output. Its almost as if there is a 'mute' switch on! I must have damaged something, but all the voltages check ok, the FPGA ...

nige2000 wrote:Vref voltages ok?

Yes, all spot on.

I'll have another good look tomorrow.

Just worked out that U39 is the RS232 transmitter, so probably not the cause of my issue and no doubt working correctly as I am able to communicate with uManager.

Val

@val33 any luck? Yes and no, mostly no. I eventually found a minute stray ball of solder caught in the legs of U39. Removing this has got uManager working again. I have reloaded the software and have full communication with the DAM, but still no output. I get flashing LED on startup and it goes sol...

Was that Q3 and Q4?

I'll try removing them tomorrow, but it was working well before I pulled the isolators.

Val

Its an R3 board.

That is with the leads disconnected, DAC off

with the power on and signal in, 0.64 kOhm

Val