I've replaced both of BC560C. Q2 Vbe 166mV Q3 Vbe 3.45V
M1 voltage between leg 1-3 is 11.56V (same as output voltage) M2 voltage between leg 1-3 0.585mV. Rload checked 99.6Ohm
Sorry the measured value on M2 is 585mV not 0.585mV
M1 must be wrong type or broken
I've replaced M1, but the voltage between 1-3 is 11.56 after the replacement. Not changed.
The measured M2 voltage is correct or is it too low?
Last edited:
If you don't have a component tester see: #132: How to test MOSFETs with a DMM - a few methods... - YouTube
I've put a new M2. I resoldered every joint. (I never had soldering problem) I measured the voltage drop on the R7 and still 0.5-1mV... and the led illuminating very low light. I measured again J1-J3 all between 85 and 100Ohm. I really don't understand. I changed the potmeter, Q2, Q3 M1, M2...
One year ago I made my own version of UltraBiB to one sided pcb, for home production. It worked first time, but a bit noisy. (I think, because of the pcb arrangement) Therefore I bought an official pcb with minikit to be sure everything will be perfect. My DAC don't want the perfect PSU
Thanks again for the patient and the help for the troubleshooting.
One year ago I made my own version of UltraBiB to one sided pcb, for home production. It worked first time, but a bit noisy. (I think, because of the pcb arrangement) Therefore I bought an official pcb with minikit to be sure everything will be perfect. My DAC don't want the perfect PSU
Thanks again for the patient and the help for the troubleshooting.
Is there a possibility some 270R is 2K7 or 27K by mistake?
All of 270R and 51R are Dale RN60D from Mouser. I measured the first, when I opened the package, and all are the same. The text are visible 2700F is the 270 Ohm, and 51R0F is the 51 ohm. 470Ohm resistor is PRP
yes, i replaced Vrr. and now it is located under the pcb.Is VRR populated underneath?
Attachments
Last edited:
- Home
- Amplifiers
- Power Supplies
- Salas SSLV1.3 UltraBiB shunt regulator