Sea Horse wrong schematic?

luaplus

New member
I think the schematic had a little problem, the pin 3 of INT pot should not be connected directly to the LED(D1), instead,
it should be connected to the point between R31 and IC4.2's Output(Pin 7), so the Vf of LED won't effect the oscillator,
and you will get a really tiny effect if you don't turn the SHAPE knob all the way up.
 
Thanks for this info! This is how it was drawn on the original schematic used, but something about that connection has always bugged me...

What you're describing makes much more sense, I'll get this updated today.
 
Yes, the PCBs are based on the schematic. I have modified PCBs on the way.

In the meantime, here's what you can do:
  1. Cut the trace marked in red
  2. Install jumper from lug 3 to right side of R31 (1K) shown
107
 
I took the edge of my flat head screwdriver (very small screwdriver) and dragged in across the trace. It came off first shot. If you look closely you'll notice if you successfully removed the copper trace. It wasn't very deep, I found at least. All in all the mods take 5 minutes.
 
I took the edge of my flat head screwdriver (very small screwdriver) and dragged in across the trace. It came off first shot. If you look closely you'll notice if you successfully removed the copper trace. It wasn't very deep, I found at least. All in all the mods take 5 minutes.
Thanks! I'll try this out :)
 
I have a sea horse that I never boxed because I was never really happy with it. I have built another one on vero in the past and remembered that the sine wave was much more pronounced on the vero. With all this quarantine time I have, I figured out that taking out the indicator light makes it much stronger. I guess you guys beat me to it. Did the trace cut (got a bit heavy handed and cut the trace from the rate knob to pin 1 of the lm324 too oops). Works perfect now.
 
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