*best* LDR for Mutron III / Neutron circuit

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oldfatbubba
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Post by oldfatbubba »

Hey, man. :) This is my first post to this forum. Howdy....

Can I get any input on what *the best* LDR is for the Mutron III / Neuton circuit? DIY is fine.

I used H11F3 opto-FET isolator for ease of implementation but, even after several hours of fiddling with the current scaling resistor, it only sounds so-so. I think the slope of their response curve of is too steep for this circuit.

Thanks,
Bubba

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mictester
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Post by mictester »

oldfatbubba wrote:Hey, man. :) This is my first post to this forum. Howdy....

Can I get any input on what *the best* LDR is for the Mutron III / Neuton circuit? DIY is fine.

I used H11F3 opto-FET isolator for ease of implementation but, even after several hours of fiddling with the current scaling resistor, it only sounds so-so. I think the slope of their response curve of is too steep for this circuit.

Thanks,
Bubba
Where did you get your H11F3s? I need some myself. The LDRs I used in my Mutron-alike were cheap 1M ones form Futurlec.
"Why is it humming?" "Because it doesn't know the words!"

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oldfatbubba
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Post by oldfatbubba »

mictester wrote: Where did you get your H11F3s? I need some myself. The LDRs I used in my Mutron-alike were cheap 1M ones form Futurlec.
Hi, mictester. They're in-stock at Small Bear Electronics...
http://www.smallbearelec.com/Detail.bok?no=702

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mictester
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Post by mictester »

oldfatbubba wrote:
mictester wrote: Where did you get your H11F3s? I need some myself. The LDRs I used in my Mutron-alike were cheap 1M ones form Futurlec.
Hi, mictester. They're in-stock at Small Bear Electronics...
http://www.smallbearelec.com/Detail.bok?no=702
They must be the solid gold ones at that price! I used to pay $4.25 / 100 of them! I hate profiteering! :evil:

The price of all the components to make (for example) a TS9 was around $2.55 including the box and the assembly costs! When you factor in testing, packing, shipping, manufacturer profit, wholesaler profit, and profit for the dealer, the old price of £29.95 was sane (but there were some big profits in that figure!).
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oldfatbubba
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Post by oldfatbubba »

mictester wrote: The LDRs I used in my Mutron-alike were cheap 1M ones form Futurlec.
So, how is the sound of your Mutron-like pedal? Can you provide any details on the specific LDR?

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Mich P
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Post by Mich P »

I've tried LED/LDR, H11F3,NSL32
And the best were the combo HAMAMATSU p873-13
With higher Rx resistor than 4,7KOhm.
Small Bear have them bit it seems
they're out of stock !
Mich P.

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oldfatbubba
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Post by oldfatbubba »

Mich P wrote:I've tried LED/LDR, H11F3,NSL32
And the best were the combo HAMAMATSU p873-13
With higher Rx resistor than 4,7KOhm.
Small Bear have them bit it seems
they're out of stock !
Mich P.
Agreed that the original part is best but they're as rare as hen's teeth. How about anything else? Do the
CLM6000's work reasonably well?

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Post by theehman »

oldfatbubba wrote:
Mich P wrote:I've tried LED/LDR, H11F3,NSL32
And the best were the combo HAMAMATSU p873-13
With higher Rx resistor than 4,7KOhm.
Small Bear have them bit it seems
they're out of stock !
Mich P.
Agreed that the original part is best but they're as rare as hen's teeth. How about anything else? Do the
CLM6000's work reasonably well?

You might try to get the unit used in the EHX Qtron (old style big box version).
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Post by oldfatbubba »

theehman wrote:You might try to get the unit used in the EHX Qtron (old style big box version).
They used Vactrol VL5C3. Any other opinions?

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Post by chicago_mike »

Thats what I use.

Otherwise you spend too much money for the 0803 part off ebay.
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oldfatbubba
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Post by oldfatbubba »

chicago_mike wrote:Thats what I use.
Thanks, Mike... Does your pedal work well in every mode?

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Post by chicago_mike »

Yeah. I also used the 5C3's in my mcmeat. :)
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oldfatbubba
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Post by oldfatbubba »

okay, thanks. FWiW, I found someone selling the original 0805A for $20. Ugh.

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jim50hertz
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Post by jim50hertz »

Hey there oldfatbubba,

Been looking for that part on and off for years, where did you find it?

Any comments on whether the pedal will behave the same without that part? i.e. with the vactrol approach?

Peace

Jim

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Kas
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Post by Kas »

jim50hertz wrote:Hey there oldfatbubba,

Been looking for that part on and off for years, where did you find it?

Any comments on whether the pedal will behave the same without that part? i.e. with the vactrol approach?

Peace

Jim
Is there anyone with answes on this post? I have the same questions.

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lerxst60
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Post by lerxst60 »

bump

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ddavis510
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Post by ddavis510 »

I have used the Hammatsu 873 from smallbear and VL5C3. Both provide good results. The vl5c3 seem to 'need matched'. I wish I knew a more efficient method of matching them. I have had to just place sip sockets and trial and use trial and error. Its tedious but it works.(anyone have a better way?) I've also replaced the 'Rx' with a pot and relocated it to the top of the build so I can adjust that on the fly. The Hammatsu has been the best so far. I built one for me and 2 for Christmas presents this year. I kept the one with the 873.

I hope it helps.

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lerxst60
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Post by lerxst60 »

Thank you sir.

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pula58
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Post by pula58 »

old post revisited:

I looked inside a few envelope filter pedals, one had two opto parts marked "NSL 7053" part, and the other had two parts marked "NSL 1053"

I tried looking these up, couldn't find much.

Anyone know which opto device they are?

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Post by chicago_mike »

Theres mods posted on a site...I forget the name of the site right now...so you can use the NSL32.

I used the VTL-5C3 and like those. I have 40 or more of those NSL-32's but haven't tried them.
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