Bottlehead Kits > Mainline
missing leds on one c4s board
jagmeetbatth:
hello
i am building amplifier using your kit and i am not getting leds on one of c4s board
the other board have leds light up
OB voltage with working c4s =around 220
OB voltage no leds c4s= 300 plus
Paul Birkeland:
--- Quote from: jagmeetbatth on November 26, 2023, 03:31:37 PM ---i am building amplifier using your kit and i am not getting leds on one of c4s board
--- End quote ---
Is this one of our kits? If so, which one?
If not, you'll have to describe what you're building to get an idea of what might be going on. Based on the limited information available in this post, the center joint of Q2 isn't always easily soldered, and this can create the issue you describe. Whatever you do, do not apply a ton of extra heat and solder to the LED solder pads themselves, as this can damage the LEDs.
jagmeetbatth:
its one of your kit .someone gave it to me to build for them
in photo the one on left side c4 board doesnt light up led and voltage at OB is diffent(higher) than other board.
there is sound output but very quiet in headphones.
the right side c4 board two led light up
Paul Birkeland:
OK, this is a Mainline kit, so I have moved your thread to that section of the forum.
Can you describe what's going on under the R4 resistors on the center C4S board?
On the center board, what are the Kreg and +reg voltages on each side?
jagmeetbatth:
i just marked red r4 resister with marker as they were missing but later found and soldered.
voltrage A side +reg=306v
kREG 1.2v
B side +reg 218v
Kreg 4.18v
DC
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