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Pots in parts lists

Pots in parts lists

2005-05-29 by Andre Majorel

Ken,

I'm a bit confused as to whether the pots appear in the parts
list. Sometimes they do, but often they seem to be completely
ommitted.

As part of preparing a life time order of components before the
impending Great Extinction, I'm writing scripts to go over various
parts lists and generate component counts. If it's easy for you to
add the pots to the parts lists, I'd be oh so grateful. If it's a
lot of work, please ignore this request.

Thanks.

--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.

Re: Pots in parts lists

2005-05-29 by Richard Brewster

Ken's PC board designs give the builder many choices for panel designs,
and this includes deciding what pots and switches you want to put on the
panel. Sometimes you will see optional pots on a hookup diagram that
are not shown on the schematic. There was a discussion here about two
weeks ago about pot options for the Wave Multiplier. Check the
archives. The short answer is it's up to you which pots to use. If you
need to know the value of a particular pot or how to hook it up, this
list is a good place to ask. The most frequently used value seems to be
100K linear taper.

I feel your pain, Andre. I spend a lot of time keeping track of what
parts I need for current projects, checking against my current parts
stock, totalling up what I need to buy, and then making up orders to
Mouser, Digi-Key or others. Look at buying in quantity. I often order
resistors in bulk of 200 from Mouser, since the price drops from 9 to 2
cents each. Buying 25 resistors costs more than buying 200. Why not
stock up. If you tally only what you need now and buy that, in the long
run you spend more.

-Richard Brewster

Andre Majorel wrote:
Show quoted textHide quoted text
>Ken,
>
>I'm a bit confused as to whether the pots appear in the parts
>list. Sometimes they do, but often they seem to be completely
>ommitted.
>
>As part of preparing a life time order of components before the
>impending Great Extinction, I'm writing scripts to go over various
>parts lists and generate component counts. If it's easy for you to
>add the pots to the parts lists, I'd be oh so grateful. If it's a
>lot of work, please ignore this request.
>
>Thanks.
>
>
>

Re: Pots in parts lists

2005-05-29 by sasami@hotkey.net.au

>I'm a bit confused as to whether the pots appear in the parts
>list. Sometimes they do, but often they seem to be completely
>ommitted.

Someone else has already explained this rather well. Mostly my parts lists
are lists of parts used on the PCB itself. Sometimes I will add the pots,
usually after someone complains about their absence.

>As part of preparing a life time order of components before the
>impending Great Extinction, I'm writing scripts to go over various
>parts lists and generate component counts. If it's easy for you to
>add the pots to the parts lists, I'd be oh so grateful. If it's a
>lot of work, please ignore this request.

It's a lot of work, especially considering that the designs are flexible,
leading to varying numbers for the same board, depending on the constructor.

Ken
_______________________________________________________________________
Ken Stone sasami@... or sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: Pots in parts lists

2005-05-29 by Andre Majorel

On 2005-05-29 16:37 -0400, Richard Brewster wrote:
Show quoted textHide quoted text
> Ken's PC board designs give the builder many choices for panel
> designs, and this includes deciding what pots and switches you want to
> put on the panel. Sometimes you will see optional pots on a hookup
> diagram that are not shown on the schematic. There was a discussion
> here about two weeks ago about pot options for the Wave Multiplier.
> Check the archives. The short answer is it's up to you which pots to
> use. If you need to know the value of a particular pot or how to hook
> it up, this list is a good place to ask. The most frequently used
> value seems to be 100K linear taper.

Oh, OK. Guess I should have figured that myself.

> I feel your pain, Andre. I spend a lot of time keeping track of what
> parts I need for current projects, checking against my current parts
> stock, totalling up what I need to buy, and then making up orders to
> Mouser, Digi-Key or others. Look at buying in quantity. I often
> order resistors in bulk of 200 from Mouser, since the price drops from
> 9 to 2 cents each. Buying 25 resistors costs more than buying 200.
> Why not stock up. If you tally only what you need now and buy that,
> in the long run you spend more.

Yes, that's exactly what I'm about to do (stocking up), and for
more reasons than one. However, I need to have an idea of how
frequently a particular component is used. Blindly buying 50x
47kA pots and 50x 22kB pots makes no sense ; I'll be out of 47kA
before I've even made a dent in the 22kB stock.

I've already made some stats from Oakley and Blacet kits but the
larger the sample the better.

For anyone interested, here's what I've got so far (covers 21
modules) :

4 10kA
3 10kB
2 22kA
37 47kA
16 47kA|100kA
2 47kAd centre detent
4 47kB
2 47kC
10 100kA
2 470kB
1 1MA
7 1MB

Dual gang :

1 47kA+47kA
1 1MB+1MB|470kB+470kB

Thank you.

--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.

Re: Pots in parts lists

2005-05-30 by Richard Brewster

Since pots are variable anyway, the value can often be substituted with
little impact on the circuit. You can often substitute a 47K or 50K pot
for a 100K pot and vice versa. I expect that in most CGS modules a 47K
pot will work where a 100K is shown, and in most Blacet modules a 100K
pot can be substituted for a 50K. Same for 470K and 1M pots. For a 22K
you could try 10K or 47K.

You could probably build all of your modules using 10K, 100K, and 1M
pots, 90% of them being 100K. Dual-gang pots are special, of course.
Center detent is a nicety, like the one on the Blacet Time Machine,
which I didn't bother with. Unless there is a trimpot that let's you
tune that detent to a precise setting, it's not worth a whole lot.

In almost all cases you can use linear taper pots. Only a few special
mixing applications need audio taper.

-Richard Brewster

Andre Majorel wrote:
Show quoted textHide quoted text
>Yes, that's exactly what I'm about to do (stocking up), and for
>more reasons than one. However, I need to have an idea of how
>frequently a particular component is used. Blindly buying 50x
>47kA pots and 50x 22kB pots makes no sense ; I'll be out of 47kA
>before I've even made a dent in the 22kB stock.
>
>I've already made some stats from Oakley and Blacet kits but the
>larger the sample the better.
>
>For anyone interested, here's what I've got so far (covers 21
>modules) :
>
> 4 10kA
> 3 10kB
> 2 22kA
>37 47kA
>16 47kA|100kA
> 2 47kAd centre detent
> 4 47kB
> 2 47kC
>10 100kA
> 2 470kB
> 1 1MA
> 7 1MB
>
>Dual gang :
>
> 1 47kA+47kA
> 1 1MB+1MB|470kB+470kB
>
>Thank you.
>
>
>

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