Duo-Phase - LDR Values

[EricDee]

I'm putting together my BOM and I'm looking at the LDR values. It doesn't look like they were specified in the build docs. I could also be overlooking something. Is there something that is working for other people?

 

[Betty Wont]

The ones from Tayda https://www.taydaelectronics.com/photo-conductive-cell-resistor-ldr-650nm-radial-ke-10720.html
Work great in this circuit. And they are the cheapest option too.

 

[danfrank]

Please see this thread:

Heads Up! Tayda LDRs ----- Waitrony KE-10720

Not a question but just to let everyone know... I just bought a bunch of LDRs from Tayda Electronics, the Waitrony KE-10720, the only one that Tayda sells. When I received them they looked off. They have more squiggly lines on their face than the Waitronys Tayda sold around a year ago. I took...

forum.pedalpcb.com

 

[cooder]

I have use the GL5516 LDRs that you find on ebay successfully before in that circuit. I do test them and try to match them before I stick them in.
https://www.ebay.com/itm/261651126658

 

[EricDee]

I think I have some GL5516s on hand so I think I'll probably give those a try. Thanks!

 

[cooder]

Maybe socket them. In hindsight I'm not too sure if I used GL5549s in there... if you have those as well try both and see which sound better.

 

[danfrank]

It would most likely be the 5516. It has the lowest on resistance and is closest to the old Tayda LDRs

 

[cooder]

I also test a bunch of them under light to see if they have a similar on resistance and group them together for what it's worth.
There seems to be a fair bit of variance in them, unsurprisingly.

 

[danfrank]

Yeah, I've noticed that. It's easy to kill several hours just matching LDRs. LEDs also have a lot of light output variance. It's hard for my eyes to tell but a LDR will pick up the differences easily.

 

[EricDee]

Okay. I might play around with a few before I solder them in.

 

[Fingolfen]

Sorry for the thread necromancy, but did we ever get a solid number on these????

 

[DGWVI]

Sorry for the thread necromancy, but did we ever get a solid number on these????

I used 5516s in my most recent builds, but will be using 9203s in my upcoming GlassHole build, and might try em in the next Duophase as well

 

[Alan W]

I tested a batch of 50 of the Tayda (recent purchase) at 3 light levels, and with the exception of a few outliers, was surprised at the consistency. They were not tight toleranced, but I could group them into say 10% spreads for each of the levels. Mainly to try and get the Duophase as symmetrical as I could. (Truly not sure if this will make a sonic difference.) Out of the 50, it was easy to get 6 pair that were very closely matched.