For anyone making single-string coils...

[Chris Turner]

I may have found a great source for pre-made bobbins: CosmoCorp

I had them send me some samples, and they look like they'd work perfectly. I don't know what their pricing is like, since I'm waiting on a quote.


Just thought I'd pass the source along, as it may help someone.

[belwar]

yeah i have some bobbins from them and they look great

[bbsailor]

I may have found a great source for pre-made bobbins: CosmoCorp

I had them send me some samples, and they look like they'd work perfectly. I don't know what their pricing is like, since I'm waiting on a quote.


Just thought I'd pass the source along, as it may help someone.

Chris,

Try Cosmo Part number 25-03649-0-000-00-0. These bobbins have a .125 center opening and the flange width that allows 6 of these to have a 2.125" width, magnet center to magnet center. The inside flange depth allows .125" of wire layers. The inside flange height is .375". The thickness of the bobbin material appears to be about .031". K&J Magnetics .125" neo magnets .5" long fit nicely. You may need to add a wedge of Scotch tape to firmly secure the magnet to the bobbin or wax in the magnet.

I have filled these bobbins with both AWG30 and AWG32 wire and used individual 8 ohm to 10K transformers to make midi transducers. Six bobbins in-line mounted near the bridge and very close to the strings produces little crosstalk between adjacent strings.

Download their very detailed on-line bobbin catalog. It will give you many ideas.

Joseph Rogowski

[David Schwab]

yeah, cool bobbins. belwar sent me one once.

[Chris Turner]

Maybe you guys that have ordered from them before can help, as they've not been quick to respond (or I'm just impatient... yeah, probably that).

They quoted some prices at quantities I asked for: 100, 250, 500. Well, they sent me some prices, apparently at those quantities, but then said that the prices are per thousand. Huh? What am I missing?


Here's what they sent (I've altered the prices a bit so as to comply with their non-disclosure request in the email):
"1-04442-0-000-00-0
Nylon 6/6 natrl
100 250 500
1006.00 700.00 405.40
Prices are per thousand. Parts are in stock. Prices are firm for
30 days."

Maybe that "Prices are per thousand" part is just something that gets sent with a quote no matter what, and I should go by the price/quantity pairs as they read.


Either way, I'm probably priced out of these for the moment. I wouldn't have guessed they'd be over 10 dollars a piece.

[David King]

Well I'd ask them for the price per 1000, I'm guessing they'd be around $.30 ea.

[Bruce Johnson]

You have to learn to understand their language......That's the way small parts are commonly quoted in industry, particularly the electronics industry.

In their computers, all the numbers are listed in price per thousand. That's common. What they are saying is:

100 parts is the minimum.
Any quantity between 100 and 249 parts will be priced at $1.001 each.
Any quantity between 250 and 499 parts will be priced at $0.70 each.
Any quantity between 500 and 999 will be priced at $0.41 each.
Etc.
Like David said, 1000 parts are probably around $0.30 each.

They are showing you where the quantity breaks are. Obviously, it would be stupid to order 249 parts. If you work the math, you'll see that 250 parts is basically the same price as 175 parts. So, if you need more than 175, you just order 250.

But they aren't going to sell you 100 parts for $0.30 each.

[Chris Turner]

You have to learn to understand their language......That's the way small parts are commonly quoted in industry, particularly the electronics industry.

In their computers, all the numbers are listed in price per thousand. That's common. What they are saying is:

100 parts is the minimum.
Any quantity between 100 and 249 parts will be priced at $1.001 each.
Any quantity between 250 and 499 parts will be priced at $0.70 each.
Any quantity between 500 and 999 will be priced at $0.41 each.
Etc.
Like David said, 1000 parts are probably around $0.30 each.

They are showing you where the quantity breaks are. Obviously, it would be stupid to order 249 parts. If you work the math, you'll see that 250 parts is basically the same price as 175 parts. So, if you need more than 175, you just order 250.

But they aren't going to sell you 100 parts for $0.30 each.

Thanks, Bruce. Yeah, that makes much more sense. The prices they gave me, if not divided by one thousand for an individual piece, made no sense at all.