Seymour Duncan Pickup Booster

[MikeH]

My friend has one of these; a very effective and quite (almost) transparent boost with a pretty usefull switching option.  I cracked his open, thinking I'd instantly recognize what type of boost it was, but it was all surface mount components, that weren't labeled in any recognizable fashion.  It seemed a bit silly to use SM components for such a simple design, they could have put it in an enclosure the size of a pack of gum if they wanted.  Is anyone out there familiar with this booster?  Does anyone know what it is?  I can't seem to locate a schematic.

[Barcode80]

you can get these all day long on ebay. all the ones i have seen have been SM components. I think it is to accomodate some of the near microscopic guitar cavities some high end guitars have.

[Gus]

take some pictures

[gez]

If there's no IC it's probably a FET.

[ramblin]

I own one of these.
And it really is a great booster for my needs.
There is a lot of compontents inside, So I am note sure what it is designed on.

[JHS]

Pics are complete useless, it's a simple trannie-triplet based booster w unknown trannies. Most values for the Rs are chosen to match those trannies. Every single opamp booster (especially when biased to class-A operation) can be used as a subtitute for this thing.

There are  2 switchable caps from input to ground (1n, none, 3n3). Input-cap is 100n, BIAS-R for the first trannie 470-510k, the rest is common.

JHS

[markm]

I've never played through one, seen a real one, or had one apart but, I would tend to agree with JHS, I doubt there is anything terribly earthshattering in one of these.