Text only | Text with Images

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: Marcos - Munky on July 15, 2004, 06:03:02 PM

Title: Anybody that built the Tremulus Lune
Post by: Marcos - Munky on July 15, 2004, 06:03:02 PM
What is the resistance of the LDR that you used?
Title: Anybody that built the Tremulus Lune
Post by: mikeb on July 15, 2004, 06:10:35 PM
Marcos - it says in the parts list the resistance goes from 5k light to 500k dark, but the LDR isn't critical. You'll note there is a trimpot, hence the amplitude attenuating effect of the opamp stage is adjustable to suit the parameters of the LDR. Anything with a dark resistance of 100k to 1M or more should be fine - if more, you could always limit the resistance by placing a resistor in parallel.

Anything you have in your parts box should work. That's what I use! ;)

Mike
Title: Anybody that built the Tremulus Lune
Post by: Marcos - Munky on July 15, 2004, 07:02:49 PM
Thanks a lot, Mike. I will try with one that I have here.
Title: Anybody that built the Tremulus Lune
Post by: travissk on July 15, 2004, 11:16:45 PM
I went ahead and ordered the suggested one, Mouser Part No. 338-54C348

3K-20K light resistance
500K dark resistance
30mW maximum power

I'd agree that whatever you have should work fine, especially if the dark resistance is higher (the other models in the Mouser catalog go to 20M dark)

Awesome sounding pedal, hope the build goes smoothly and you enjoy it!
Title: Anybody that built the Tremulus Lune
Post by: Marcos - Munky on July 16, 2004, 11:27:04 AM
I will test it today. I finished it, just need the switch. I don't know the values of the LDR, but I'm sure it goes from about 4K light and more than 1M dark.
Title: Anybody that built the Tremulus Lune
Post by: axr on July 16, 2004, 04:35:49 PM
marcos i`ve used one 10k and 1m (dark) without a problem
Title: Anybody that built the Tremulus Lune
Post by: Marcos - Munky on July 17, 2004, 10:45:59 AM
I tested it, it sounds really beautiful. I just have one problem, it distorts the sound a little, but it's a cool distorted sound. Maybe I will keep the distortion as a feature of the effect.
Title: Anybody that built the Tremulus Lune
Post by: mikeb on July 17, 2004, 05:23:11 PM
Hi Marcos

It isn't supposed to distort :), so if you decide to do something about it look at the tweaking docs on this page:
http://commonsound.com/tremulus.html
specifically page 2 (relates to undwanted distortion).

BTW, what dual opamps did you use?

Mike
Title: Anybody that built the Tremulus Lune
Post by: Marcos - Munky on July 18, 2004, 01:15:50 PM
Hi Mike. I will take a look. I used the suggested ones, a TL072 and a JRC4558.
Title: Anybody that built the Tremulus Lune
Post by: Marcos - Munky on July 21, 2004, 03:40:25 PM
I found the problem. It was the trimpot setting. Now it's clean, but I let it a little distorted. I think this gives a little color to the sound.
Title: Anybody that built the Tremulus Lune
Post by: mikeb on July 21, 2004, 04:50:11 PM
Excellent - often a little distortion makes MOST effects sound better (non-distortion effects) ... ;)

Mike
Title: Anybody that built the Tremulus Lune
Post by: Jason D on July 21, 2004, 05:38:39 PM
I am using the Tremulus Lune for a school senior project.
Could anyone tell me what basic circuit the LFO is based on?
And, any equations to figure out what is going on?


Thanks.
Title: Anybody that built the Tremulus Lune
Post by: mikeb on July 21, 2004, 05:44:43 PM
Look through app notes for opamps - this info is all in there.

Mike
Text only | Text with Images