Hi Phil,

I did a one-off cylindrical PCB like this before. It was something like 60m=
m=20
diameter, wrapped around an aluminium (aluminum) cylinder as a former/suppo=
rt=20
and a heatsink. All SMD parts on the outside, PIC, high power LEDs etc.

As an alternative to PFC we used single sided FR4 fibreglass, but 0.2mm thi=
ck=20
instead of the "standard" 1.6mm. It was a fairly tight wrap but held in pla=
ce well with=20
some cable ties. If I did it again I'd probably go for 0.1mm, with holes & =
slots where=20
the ends overlap when wrapped to screw it to the aluminium cyinder. Parts w=
ere=20
soldered on with the board flat, then re-touched when wrapped to remove str=
esses.

0.1mm and 0.2mm should be commonly available as they are used in laminating=
=20
and building up multi-layer PCBs... most PCB houses should be able to do it=
..

Brent

On 8 Oct 2015 at 20:36, Phil Keller wrote:

> All,
>    I have been asked to build a circuit on flexible PCB.  The design=20
> does not really need to flex but the PCB needs to be cylindrical. Think=20
> of it as putting a small design on the outside of a roll of cellophane=20
> tape, with all of the devices facing outwards.  I have poked around the=20
> WEB and everything I have found so far is referring to flexible=20
> interconnect, not a flexible circuit.  I know that it is being done but=20
> I can not find a reference so that I can start my learning process.
>=20
>    Suggestions would be greatly appreciated.
> -Phil-



--=20
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