Tremulus Lune speed pot

[south_saturn]

Hi,

I'm putting together a tremulus lune and instead of having both speed and fine speed pots I'd rather have just a master speed control. Can anyone suggest a pot value that I could use for this?

Here's the layout:
http://tonepad.com/getFileInfo.asp?id=84

thanks guys

[darron]

if you take a look at the schematic, the SPEED and FINE pots are both in series. one is 10K and the other 1K. So basically you have the 10K to set where you want it roughly, and the 1K to fine tune in a little more. that's obvious.

so in series, the resistors add up to 11K. what you should do is just eliminate the fine pot and have both ends of the 10K pot go to the circuit board. the 0-1K won't make much difference. it will just mean that you won't have the potential to set the rate a TINY bit slower than if the 1K pot was in there.

i haven't built the trem-lune, but i made something with the same sort of circuit. can anybody think of any problems with my suggestion?

[Jackie Treehorn]

I wanted one speed knob, too, so I used a precision 10 turn 10k pot.  It gives a fine range of speed control without the extra knob.

[south_saturn]

Excellent guys thanks. I thought of just using a 10k pot but I wasn't sure if I'd missed something really obvious.

I will report back

[Mick Bailey]

I posted this previously, but its worth adding here;

Firstly, I highly recommend the ramp-up ramp-down mod, though for this to work effectively you need to be able to slow down the LFO more than the original design allows. Do this by replacing the stock "Speed" 10k pot with a 47k pot. This will also give you a vastly improved slow speed for the normal setting (ramp switch in the centre position). It also allows you to fully explore the spacing control.

Also, the "fine" control has an almost imperceptible effect on the speed. To correct this, replace the 1k stock pot with a 4.7k pot. This still gives the 10:1 ratio between the two controls, but each has a greater range to further extend the usable range of this pedal.

I also recommend that you include a pot for the gain control, rather than a trimpot on the PCB. I used a 4.7k pot in the end, after experimenting with values. This gives a useful, but not extreme, gain boost when on maximum and allows you to balance the effected and bypassed sounds easily.

If I only were to use one pot I would go for 47K or 50K.

[south_saturn]

I'll give both the 47k and the 10k a try.

I'm half tempted to buy a 1590DD enclosure and make a comprehensive TL, all of the bells and whistles.