I've been reading through most of this thread once again, and I was also offered a set of PCBs as requested, so I might give this one a go, beautiful as it is! Hats off for Cheff!
And I most ecertainly need a new set of amps.
I found the zip for the PCB, which I may or may not need ( I will need the silk overlays though), but is there a zip somewhere with the corresponding schematics and comp. numbers for all the additional boards except the UGS module itself?
And I most ecertainly need a new set of amps.
I found the zip for the PCB, which I may or may not need ( I will need the silk overlays though), but is there a zip somewhere with the corresponding schematics and comp. numbers for all the additional boards except the UGS module itself?
AuroraB said:
Usually LeCheff's boards are designated with the component values. I for one pretty much like that! Usually you will have to compare the schematic's to the board's
Go figure; you actually have to do a little work yourself.Dont hesitate building LeCheff's UGS, everything else is somewhat pale and "bloodless" in direct comparison.......
An externally hosted image should be here but it was not working when we last tested it.
UGS circuit of extreme simplicity, is the output current smaller, more select class after.
I use Nelson Pass F4 power circuit when the buffer output ,current small problem disappeared ....
Update
I have replaced the atmega64 chip. All joints are now very clean and the legs of the chip are perfectly positioned. I now read 5V on the chip when power is connected and there is no continuity between 5V pins and ground.
I have also replaced the 74HC244 chip. I ued a 74HC244 OCTAL TRI-STATE BUFFER (DIL) RC from Rapid electronics. When I power the uC board I get 4.41V between pins 20 and 10 on the 74HC244 chip, which is fine.
I ran Ponyprog again but it still comes back with "device unknown or not present". Calibration still comes back as OK though.
One interesting point: I am plugging the prog-board into LAPT1 on my laptop. When my laptop is being powered from the mains is causes a problem to the PSU of the uC (the transformer buzzes). However when my laptop is powered by its own battery there is no problem.
Ideas welcome.
I have replaced the atmega64 chip. All joints are now very clean and the legs of the chip are perfectly positioned. I now read 5V on the chip when power is connected and there is no continuity between 5V pins and ground.
I have also replaced the 74HC244 chip. I ued a 74HC244 OCTAL TRI-STATE BUFFER (DIL) RC from Rapid electronics. When I power the uC board I get 4.41V between pins 20 and 10 on the 74HC244 chip, which is fine.
I ran Ponyprog again but it still comes back with "device unknown or not present". Calibration still comes back as OK though.
One interesting point: I am plugging the prog-board into LAPT1 on my laptop. When my laptop is being powered from the mains is causes a problem to the PSU of the uC (the transformer buzzes). However when my laptop is powered by its own battery there is no problem.
Ideas welcome.
The "only" things to change are the source resistors (22R & 47R)
The best way is to use a breadboarded schematic as depicted here :
http://www.homecinema-fr.com/forum/viewtopic.php?p=171952037#p171952037
Before testing a JFet, set the variable R to its max resistance.
Then plug the fet and the battery, and set the res to read 3.5 to 4 mA
Unplug all and measure the resistor value, and write it down.
Do the same for the other fet in the case, note the resistor, and average the two values.
Then use this value for the new source resistor on the pcb.
Remember to substract 25 Ohms (VR2/2) to the found value for the 2SJ109
Hope this helps
The best way is to use a breadboarded schematic as depicted here :
http://www.homecinema-fr.com/forum/viewtopic.php?p=171952037#p171952037
Before testing a JFet, set the variable R to its max resistance.
Then plug the fet and the battery, and set the res to read 3.5 to 4 mA
Unplug all and measure the resistor value, and write it down.
Do the same for the other fet in the case, note the resistor, and average the two values.
Then use this value for the new source resistor on the pcb.
Remember to substract 25 Ohms (VR2/2) to the found value for the 2SJ109
Hope this helps
Finished !!!
Couple of days ago i finally finished my UGS.
It has been playing for many moons now but i had to learn how to use my CNC properly to finish the case.
It's more or less accomplished, this was my first DIY for many years, next one will be better.
Great many thanks to François and of course NP for this sweet thing , their generosity is amazing.
( ...many thanks too for ZMs patience because i put the Shanling project on hold to finish this one first...i'll now make it the CD player it can be. )
Couple of days ago i finally finished my UGS.
It has been playing for many moons now but i had to learn how to use my CNC properly to finish the case.
It's more or less accomplished, this was my first DIY for many years, next one will be better.
Great many thanks to François and of course NP for this sweet thing
, their generosity is amazing.( ...many thanks too for ZMs patience because i put the Shanling project on hold to finish this one first...i'll now make it the CD player it can be. )
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