DSpenceATL
New member
Hello all,
I have exhausted my options with this build, so I think I’m in need of some fresh eyes and ideas.
I’ve completed a circulator build, and everything seems mostly normal, except that the output is well below unity volume. I’ve gone through it with an audio probe and identified that the signal becomes quieter at all of the 1.2k resistors (R8, R12, etc.)
I’ve done a reflow, scrub down with 99% alcohol, tested and tested and tested, and gone over this thing with a bright light and a magnifier looking for issues. I’m sure it’s right under my nose, but I think I need some outside perspective.
Recorded voltages follow
Non-Vref voltages are average, they move around a little bit in a small range.
IC3 voltages presented as a range are swinging wildly so I just posted the top and bottom.
IC1
1 1.23
2 1.55
3 4.55
4 4.55
5 5.67
6 -
7 5.71
8 4.55
9 4.55
10 5.73
11 9.12
12 5.66
13 4.54
14 4.55
15 1.52
16 1.13
IC2
1 1.19
2 1.59
3 4.55
4 4.55
5 5.71
6 -
7 5.68
8 4.55
9 4.55
10 5.68
11 9.12
12 5.68
13 4.55
14 4.55
15 1.18
16 1.15
IC3
1 1.21
2 0.71
3 1-6v
4 1.96
4 2-4.5v
5 2-4.5v
6 -
7 2-4.5v
8 2-4.5v
9 2-6.5v
10 2-6.5v
11 9.12
12 2-6.5v
13 2-3v
14 2-6.5v
15 0.81
16 0.87
IC4
1 4.55
2 4.55
3 4.14
4 -
5 4.55
6 4.55
7 4.55
8 9.12
IC5
1 4.55
2 4.55
3 4.55
4 -
5 4.55
6 4.55
7 4.55
8 9.12
Apologies for the somewhat messy PCB, it’s definitely not as clean as when I built it due to so much troubleshooting. Ignore the yellow wires, they were thrown on in a hurry because the solid core ribbon cable broke from too much handling while troubleshooting.
I have exhausted my options with this build, so I think I’m in need of some fresh eyes and ideas.
I’ve completed a circulator build, and everything seems mostly normal, except that the output is well below unity volume. I’ve gone through it with an audio probe and identified that the signal becomes quieter at all of the 1.2k resistors (R8, R12, etc.)
I’ve done a reflow, scrub down with 99% alcohol, tested and tested and tested, and gone over this thing with a bright light and a magnifier looking for issues. I’m sure it’s right under my nose, but I think I need some outside perspective.
Recorded voltages follow
Non-Vref voltages are average, they move around a little bit in a small range.
IC3 voltages presented as a range are swinging wildly so I just posted the top and bottom.
IC1
1 1.23
2 1.55
3 4.55
4 4.55
5 5.67
6 -
7 5.71
8 4.55
9 4.55
10 5.73
11 9.12
12 5.66
13 4.54
14 4.55
15 1.52
16 1.13
IC2
1 1.19
2 1.59
3 4.55
4 4.55
5 5.71
6 -
7 5.68
8 4.55
9 4.55
10 5.68
11 9.12
12 5.68
13 4.55
14 4.55
15 1.18
16 1.15
IC3
1 1.21
2 0.71
3 1-6v
4 1.96
4 2-4.5v
5 2-4.5v
6 -
7 2-4.5v
8 2-4.5v
9 2-6.5v
10 2-6.5v
11 9.12
12 2-6.5v
13 2-3v
14 2-6.5v
15 0.81
16 0.87
IC4
1 4.55
2 4.55
3 4.14
4 -
5 4.55
6 4.55
7 4.55
8 9.12
IC5
1 4.55
2 4.55
3 4.55
4 -
5 4.55
6 4.55
7 4.55
8 9.12
Apologies for the somewhat messy PCB, it’s definitely not as clean as when I built it due to so much troubleshooting. Ignore the yellow wires, they were thrown on in a hurry because the solid core ribbon cable broke from too much handling while troubleshooting.
