ABDX modulation

[gitaar0]

Great that this is sorted out. In the meantime I had alraedy figured out the effect of the 15 volt might be the problem or part of it. I glad that is confirmed.

Thanks, Brian

[gitaar0]

When turned down the deph pot still has quite a bit of depth.
Is there a way to make the minimum lower? Resistor paralell to the ldr?

[madbean]

Same thing: increase R50 and R51, but keep them identical values. This will shift the max depth value down, though. Alternatively, you could go up to 250k or 500k on the Depth pot to keep the same max depth and decrease the min depth.

[gitaar0]

Had tried increasing r50 and r51 already. Went up to 12k.
Although it had an influence on the min depth there was not much change compared to the 8k5 i had there.
What did change was the amount of depth. The higher vakue the lower the deph left.
I will try the different pot value.

I'll let you know.

Thanks.
marc

[gitaar0]

250k for the depth pot with r50 and r51 8k5 works ok.


Another question.
I have the delay biased right. The mix pot has now a unity at around 10 o'clock.
What can i do best:
-lower the input to the bbd's to get an even cleaner delay. How?
-change the value of r38
-change the mixpot to 50k log or to 100k?

Next question:
With a double delay board it works with 3 mn3005s.
I have used the double delay board for the original aquayboy wih the values for that.
When biased right the delay is very loud and has oscillation very early in the feedback pot.
The last thing makes sence as the delay is loud. What to adjust here?

Thanks.

[madbean]

What can i do best:
-lower the input to the bbd's to get an even cleaner delay. How?
Try a higher value resistor for R55 and/or R27. It may help.
-change the value of r38
Increase the value of R38 to move unity gain closer to the 12ock position.
-change the mixpot to 50k log or to 100k?
Changing it to 50kA will shift the unity position as well. Using 100k might actually make the problem worse.

Next question:
With a double delay board it works with 3 mn3005s.
I have used the double delay board for the original aquayboy wih the values for that.
When biased right the delay is very loud and has oscillation very early in the feedback pot.
The last thing makes sence as the delay is loud. What to adjust here?
Increase R39 to move the oscillation point on the Feedback pot, or use a higher value pot for the T1 trimmer.

Thanks.

[gitaar0]

I changed the trimpot t1 to 100k.
That did not help much. Suggestions?

Changed r38 to 100k and now unity is at noon.

What can i do best:
-lower the input to the bbd's to get an even cleaner delay. How?
Try a higher value resistor for R55 and/or R27. It may help.
-change the value of r38
Increase the value of R38 to move unity gain closer to the 12ock position.
-change the mixpot to 50k log or to 100k?
Changing it to 50kA will shift the unity position as well. Using 100k might actually make the problem worse.

Next question:
With a double delay board it works with 3 mn3005s.
I have used the double delay board for the original aquayboy wih the values for that.
When biased right the delay is very loud and has oscillation very early in the feedback pot.
The last thing makes sence as the delay is loud. What to adjust here?
Increase R39 to move the oscillation point on the Feedback pot, or use a higher value pot for the T1 trimmer.

Thanks.