Chalumeau LDR Suggestions

[CheapSuitG]

Bonjour!

I was checking the build docs for the Chalumeau, and they mention an LDR, but I couldn't find any specific details though I might be looking in the wrong place. Quick search found threads that talk about LDR placement but not which one.

Do you have any recommendations on what to use?

Thanks!

 

[Diynot]

Looks like it’s not particularly important which LDR you choose, but my suggestion would be to look for one that responds best to the wavelength of a yellow LED. The range of the LDR will simply affect the depth of the wobbles. Greater range = more wobble. I know real scientific explanation

 

[CheapSuitG]

I was hoping more warbles than wobbles but think I can figure something out!

Looks like it’s not particularly important which LDR you choose, but my suggestion would be to look for one that responds best to the wavelength of a yellow LED. The range of the LDR will simply affect the depth of the wobbles. Greater range = more wobble. I know real scientific explanation

 

[CheapSuitG]

Diving in, the offerings here at PPCB don't show the wavelength NM numbers.

If the google is correct, it is saying 575-595nm, is that the correct spec I should be looking for?

 

[CheapSuitG]

Cancel that, found a thread with some different search terms and found an answer. Added "range" and came up with a thread. Also it was spelled wrong.

I figured there would be a thread about this!

Thread 'Chalameau/Clari(not) LDR range?'

Sep 5, 2019

Has anyone who’s built the Chalameau clone of the Clari(not) know what the range of LDR is?

Thanks in advance,
James

• Jbanks
• Replies: 5
• Forum: General Questions

 

[Diynot]

If you pull a data sheet from Mouser or Tayda for a particular LDR it should give the wavelength response

 

[pricklyrobot]

Yeah, was just going to say GL5528 is what I’ve seen recommended for the Pitch Witch (Pirate). Figured there’s a good chance Chalumeau (Clarinot) uses the same one.

 

[Erik S]

I used a 9203 from stompboxparts.

Probably because @DGWVI said that’s what he used.

 

[pricklyrobot]

If you pull a data sheet from Mouser or Tayda for a particular LDR it should give the wavelength response

I think the issue (based on this and other LDR-related threads I’ve perused) is not so much about being able to find the specs for a given LDR, but more about trying to figure out what specs you should be shooting for for a given project.

The Pitch Witch doc at least list the LDR value as 1M (you still need to do a little bit of research to figure out that that’s the Dark Resistance value).

The Chalumeau doc literally just says “LDR”. I guess one interpretation of this could be that the value doesn’t matter, at all

 

[Diynot]

I think the issue (based on this and other LDR-related threads I’ve perused) is not so much about being able to find the specs for a given LDR, but more about trying to figure out what specs you should be shooting for for a given project.

The Pitch Witch doc at least list the LDR value as 1M (you still need to do a little bit of research to figure out that that’s the Dark Resistance value).

The Chalumeau doc literally just says “LDR”. I guess one interpretation of this could be that the value doesn’t matter, at all

See my first post. The only reason I suggested paying attention to the wavelength is because a yellow LED is being used as the driver and you will get the most out of whatever range the LDR has if you match the wavelength.