Useful to have boards to build when you need to take your mind off things.
Thanks Salas and Tea-Bag for these great projects!
L-Adapter up and running (a music server), UltraBiB in progress.
You are welcome. Nice photo by the way.
Confirmed all semiconductors are in the correct place and I re-flowed Q2, Q3 and C2. Still no change.
M2 measures 3.58v (between two outside pins)
Q2 and Q3 measure .625v (middle and right pin when facing the flat "face")
M2 measures 3.58v (between two outside pins)
Q2 and Q3 measure .625v (middle and right pin when facing the flat "face")
After rechecking all semis are the right ones at the right places see if Q2 Q3 actually give 0.61V Vbe and M2 few volts Vgs. Also retouch Q2 Q3 C2 joints.
It's a bit tough to measure now that it's soldered, but at one extreme I'm measuring approx. 75ohms and when turned the other way it reads about .4. When I turn back 5 or so turns I'm reading 72.5. I used these 10k variable resistors.
3296Y-1-103LF Bourns | Mouser
3296Y-1-103LF Bourns | Mouser
Correct, vout doesn't change. I'm using a 50va 2x15v toroid. I get 15vout on the other secondary with a different power supply. My target vout for the ultrabib is 15v and 200mA CCA. Right now I have a 3ohm resistor at r1. The 4.91v is unloaded, when I use a 20ohm resistor I have as a load, this drops about 1v to 3.9v.
After double checking, yes you are correct! Thanks.
When all bias voltages seem proper could it be your vrr is a 75Ω resistor instead of 75k by mistake?
I see the +/- boards are electrically seperate. I have 2 18v toroids from when I built DCG3 with DCSTB. I purchased these wrong for thr DCSTB.....these trafo have just 1 output(2 wires). So would these 2 trafo be ok to power Ubib.....seperate trafo for each rail....aiming for 15v so maybe a little 'hot' secondaries?
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