Knowing How to Source Components

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

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th0mas
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Post by th0mas » Tue Feb 01, 2011 12:15 pm

frozenkore wrote:One thing I forgot to mention in finding parts. I was "fixing" my M28 and needed 330k(?) resisters. I didn't want to place an order for two resisters and pay :75: shipping. I hopped on ebay and got 100 for $5 (shipped). So if you need something here and there, ebay can sometimes get you it fast, large quantities, and cheep.
If you search for what you need and add the word "lot" you can often get a large number of it for cheaper.

Years ago I bought 100 500kohm pots, 100 spdt switches from an ebay vendor, as well as 50 stereo 1/8" jacks. All for pennies on the dollar and I still have some for every project.

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Peake
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Post by Peake » Tue Feb 01, 2011 3:59 pm

Good tip!
This is not the place I'd imagined it to be.

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Post by active » Thu Feb 03, 2011 1:55 pm

i have another question. just spent a day putting together an order, forgot a fair amount of stuff too.

trimmers for the CGS stuff.

most on the boards seem to be 4 pin trimmer leads, and the ones i got, and really only could find on mouser, are all 3 leads. i am pretty new to trimmers, so what would the 4th leg be? did i totally fuck up? if so anyone need some 3 legged trimmers?

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iopop
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Post by iopop » Thu Feb 03, 2011 2:28 pm

Multi-turn trimmers are available with a few different number of pin outs either,

Code: Select all

/-------\    /-------\
|   x   |    |       |
| x   x |    | x x x |
+-------+ or +-------+
What I think Ken have done is that he have laid out a trimmer such as

Code: Select all

/-------\
|   x   |   
| x x x | 
+-------+
Where the middle solder holes are the connected to each other - allowing you to use either type of trimmer. At least that the case on some of the multi-turn trimmers on the VCO.

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magman
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Post by magman » Thu Feb 03, 2011 3:35 pm

I can confirm what iopop says for the CGS boards that use a multiturn pot, for example on the CGS26 Analog Logic board and CGS48 VCO.

There are different pinouts for the single turn pots though, like the 25k pots on the CGS48 VCO again and the 100k pots on the CGS114 DUSG. You can use multiturn pots for these, but you have to use the offset pinout, like iopop's first diagram.

Regards

Magman

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russma
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Post by russma » Thu Feb 03, 2011 6:16 pm

+1 for iopop's answer; the VCS has that trimmer pinout too. Props to Ken for that, very versatile.
Russ M.

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Luka
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Post by Luka » Thu Feb 03, 2011 6:49 pm

trimmers vex me
i wish everyone would use vertical ones
the horizontal ones come in such a range of sizes and keeping them all in stock is impossible.

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Post by active » Fri Feb 04, 2011 11:20 am

awesome! thanks for that accurate answer! i noticed that the two holes shared a tracer, but i wasn't sure if there were any weird pinouts on the trimmer. solder party! :party:

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kindredlost
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Post by kindredlost » Sat Feb 05, 2011 7:57 am

I have panned (swiftly) through these responses and I don't recall seeing anyone mention the rarified parts offered at Bridechamber.
Not everything, but most of the chips and pots, etc. that are common to a few popular modules...

http://bridechamber.com/Parts.html

I was actually miffed at the fact that I forgot about this when searching a day or so for an obsolete transistor array. :bang:

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magman
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Post by magman » Sat Feb 05, 2011 10:04 am

There are a couple more links that I've not seen posted in this thread so far that might be of interest:

For those hard to find components that synths tend to use:

http://burnit.co.uk/sdiy/part_search.php

You can even choose between a UK or USA Bias.

A good reference site for Synth DIY components is the one produced by Andre Majorel, here:

http://www.teaser.fr/~amajorel/sourcing/

This page also has links to other substitution pages as well.

Regards

Magman

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kindredlost
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Post by kindredlost » Sat Feb 05, 2011 1:32 pm

@Magman... that is a great resource (teaser.fr).

Although much of the last shipping and vendor review is mostly UK/EU oriented, it still rings true for some of what I've experienced.

Thanks!

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magman
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Post by magman » Sun Feb 06, 2011 4:55 am

While we're talking UK orientated, another good resource I forgot to add yesterday are the useful doc's on the Oakley site.

http://www.oakleysound.com/projects.htm

Look down the page at the Useful information section. The Parts Guide is what I'm mainly refering to, but all of these documents are quite useful to a beginner.

Regards

Magman

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Paradigm X
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Post by Paradigm X » Mon Aug 22, 2011 7:14 am

Lol. Make sure you check the quantities. Just had 5 tubes of 30 DIL sockets (14 and 16 pin) instead of 5 of each delivered. 300 sockets ! :lol:

Ill be alright for sockets for a while then :doh: :lol:

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lazerkind
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Post by lazerkind » Mon Aug 22, 2011 7:30 am

magman wrote: http://www.oakleysound.com/projects.htm

Look down the page at the Useful information section. The Parts Guide
That is a great guide, I wish I had found it years ago.
//L

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Willzyx
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Post by Willzyx » Wed Aug 24, 2011 8:33 am

Quick Mouser resistor tip:

At mouser the part # for resistors are all based on the same numbers.

271-10K-RC is the part number for a 10K 1% 1/4w resistor.

The 271 is the family for the part, in this case a 1% 1/4w resistor.
The value is put in the middle.
271-“value”-RC
ie:
if the value is
10ohms = 271-10-RC
10K = 271-10K-RC
10Meg = 271-10M-RC
5.1K = 271-5.1-RC

291-“value”-RC for 5% carbon film resistors
ie:
10ohms = 291-10-RC
10K = 291-10K-RC
10Meg = 291-10M-RC
5.1K = 291-5.1-RC

This makes ordring the the resistor part of the BOM a lot faster. Also check the price breakdown as it can be cheaper in some cases to buy more.

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Multi Grooves
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Post by Multi Grooves » Mon Jul 24, 2017 6:06 pm

I'm building a Zlob VCA and it is missing a 6.2K resistor. All of the components are 5%. I guess it'd be perfectly fine replacing with a 1% tolerance version?
...but Cynthia, my Daddy never had a heath kit..

FS: SSF Entity

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pre55ure
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Post by pre55ure » Mon Jul 24, 2017 7:02 pm

Yep , that will be fine. You can always go more precise, but not necessarily the other way.

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Vortico
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Post by Vortico » Mon Jul 24, 2017 7:14 pm

Remember that the 1%'s are segregated away from the 5% bins before distributing them, so the distribution of 5% actually looks like this.

Image

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rithma
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Post by rithma » Mon Jul 24, 2017 8:00 pm

Remember that the 1%'s are segregated away from the 5% bins before distributing them, so the distribution of 5% actually looks like this.
that's actually really interesting... took me a few times reading that to understand;
that's to say 5% parts will most likely be 5% away from their designation?


you sure learn something new every day!
/rithers

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Multi Grooves
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Post by Multi Grooves » Mon Jul 24, 2017 8:26 pm

Thanks.

@rithma: I loved buying OM vinyl bitd...You have any connection to those guys?
...but Cynthia, my Daddy never had a heath kit..

FS: SSF Entity

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Multi Grooves
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Post by Multi Grooves » Mon Jul 24, 2017 8:49 pm

I'm having a nightmare trying to measure capacitance of these -||-

I've done the resistor over the legs of the capacitor [discharge] and then try to measure using a cheap meter but the readings give nothing unless I press REL but the results still don't tally with what the build requires.

:hmm:
...but Cynthia, my Daddy never had a heath kit..

FS: SSF Entity

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rithma
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Post by rithma » Mon Jul 24, 2017 9:10 pm

@Multi Grooves -
yep, same Rithma, released a number of things on Om way back when.
It's been a few years since i released music but I think Om is still going strong.

/rithers

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duff
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Post by duff » Tue Jul 25, 2017 12:23 am

Vortico wrote:Remember that the 1%'s are segregated away from the 5% bins before distributing them, so the distribution of 5% actually looks like this.

Image
Are you sure? What do they do with the 1% values they take out of the bins?

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Vortico
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Post by Vortico » Tue Jul 25, 2017 12:58 am

Take your first guess.

Although, the distribution is not always like this. Sometimes they have a surplus of 1%'s so they add those to the 5% pile to get rid of them before the end of the year.

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duff
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Post by duff » Tue Jul 25, 2017 1:24 am

Vortico wrote:Take your first guess.

Although, the distribution is not always like this. Sometimes they have a surplus of 1%'s so they add those to the 5% pile to get rid of them before the end of the year.
Well given <=1% are metal film and 5%-20% are carbon I don't have a guess.

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