Yeah, on the shunt regulator board, you can measure the voltages at IA/IB, OA/OB, and Ba/Bb.
a few LED's no longer light up [solved]
- Thread starter wesleyHK
- Start date
;D paul, i solved it!
since the voltage at OA was abnormal, i looked closely at the board. looking from the top, i noticed that 2 solder points at the MJE5731A transistor were touching by a very, very minute amount, so i got out a syringe needle and scraped it a tiny bit so that they were separated and that did it.
the voltages are now as follows. the LED's now light up 8) .
IA 118.1
IB 118.0
OA 106.8
OB 107.7
BA 0
BB 0
thanks again for your help paul, GREATLY APPRECIATED
.
since the voltage at OA was abnormal, i looked closely at the board. looking from the top, i noticed that 2 solder points at the MJE5731A transistor were touching by a very, very minute amount, so i got out a syringe needle and scraped it a tiny bit so that they were separated and that did it.
the voltages are now as follows. the LED's now light up 8) .
IA 118.1
IB 118.0
OA 106.8
OB 107.7
BA 0
BB 0
thanks again for your help paul, GREATLY APPRECIATED
.
There's magic in them numbers!
I'm glad you got it up and running!
I'm glad you got it up and running!
airdronian
New member
wesleyHK said:;D paul, i solved it!
since the voltage at OA was abnormal, i looked closely at the board. looking from the top, i noticed that 2 solder points at the MJE5731A transistor were touching by a very, very minute amount, so i got out a syringe needle and scraped it a tiny bit so that they were separated and that did it.
the voltages are now as follows. the LED's now light up 8) .
IA 118.1
IB 118.0
OA 106.8
OB 107.7
BA 0
BB 0
thanks again for your help paul, GREATLY APPRECIATED
Glad you and PB were able to solve this. These sorts of posts are very helpful to those of us starting out. Thanks.
airdronian said:wesleyHK said:;D paul, i solved it!
since the voltage at OA was abnormal, i looked closely at the board. looking from the top, i noticed that 2 solder points at the MJE5731A transistor were touching by a very, very minute amount, so i got out a syringe needle and scraped it a tiny bit so that they were separated and that did it.
the voltages are now as follows. the LED's now light up 8) .
IA 118.1
IB 118.0
OA 106.8
OB 107.7
BA 0
BB 0
thanks again for your help paul, GREATLY APPRECIATED
Glad you and PB were able to solve this. These sorts of posts are very helpful to those of us starting out. Thanks.
you're more than welcome. with a few builds under my belt, i thought i wouldn't encounter any problems, boy was i wrong. life is about learning, no matter how old we are.
