rille
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About rille
- Birthday 02/03/1970
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The power supply is working now. I used the BUZ80 instead of the Ixys 10M90S with some modifications: But the amp makes problems. The problem seems to be also the Ixys parts. I measured ~9V across R12/R19 only at one transistor. I guess this is ok? The other 3 seems to be defective (~0V across the R12/R19). I guess nearly all the Ixys parts from Littlediode were defective. Or they are fake parts. I will complain about the parts.
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The printing on the power supply board for BR1 is wrong. The "+" is at the wrong side. I guess it's a board from the current group buy (Production Rev 0.6). So be carefull if you have one of these boards.
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Thanks, this answers my question
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Nobody any idea?
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How do I build the Power Supply v8 as simple version (only zener diodes)? I guess there is a connection between the Cathode of D5 and the Gates of Q1/Q2 missing. In version 4 was there a 250kOhm resistor (R23). Should I add it also in v8?
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@livewire The insulation is ok now, I used the thick insulators and plastic screws. Also all traces were cut. The problem is really the current source. A friend showed me an alternative current source with the BUZ80, which is easily to get here.
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The voltage is much too low, only some mV. The strange thing is that in the working part it's also too low. I really have no idea why they are defective. I changed Q8 and Q17 already. I bought them from littlediode. I hope they don't sell faked parts. Is there any alternative for the 10M90S which is better available and not so expensive in Europe? They cost > $10 and it takes two weeks to get them
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After having no success at all I tried this today with 3 x 160V zeners. It's still not working. The output voltage raises slowly. After 10 min it reaches 285V. Is it normal that the voltage across the zener diodes drops instantly if I want to measure it? Also the voltage across D7-D10 is IMHO too low. I get only 98V and not 580 V as expected.
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Was anybody successfull to build the PSU version 3 at the corresponding PCB? I have still problems, livewire had problems too. Perhaps there's something wrong with the PCB? Or this version was not the best solution. Version 4 has some changes.
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Thanks for your help I measured Q4-7 (all voltages to GND): Q4 (B/E/C): 46,15/46,60/30,1 Q5 (B/E/C): 54,7/47,3/17 Q6 (B/E/C): 27,8/30,4/0,6 Q7 (B/E/C): 27,8/16,8/0,02 Output voltage was ~56V. The voltage is not stable and fluctuates a little bit. I didn't matched the transistors in the power supply. Only in the amp section.
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At the LM4040 I can measure 10V. I will measure at the other points tomorrow. Yes, I read it. The only question is if I should leave the cap in parallel to the zeners. I guess yes because I saw it in other power supplies. Thats the problem. Generally some more information and help would be nice
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My power supply is still not working. Could any of the changes between Version 3 and 4 help? If I change to the simple version with zener diodes I would only need the diodes? Also the cap in parallel (C5, C6)? I get ~60V from the positive rail. I changed all semiconducters already
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Not yet. I'm still struggling with the power supply
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What did you do? It's possible This was done with a cordless electric screwdriver and a hand thread cutter. It's a Pesante Dissipante 2U:
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Thanks for your reply. I will try changing the parts first.