On Sun, 19 Feb 2012 13:08:24 -0500, you wrote:
>Hello,
>
>With the "JetStar Premium film", I do not have to buy photosensitive
>boards? Can I make the photosensitive boards from normal boards using this?
>The photo pcb's are pretty expensive. Would be cool if this is a cheaper
>option.
You expose the photosensitive boards with a "mask", a positive, black
where there is to be copper, kind of transparency. That's what the
film is for.
Toner Transfer transfers the toner directly from the paper to the
board, and the toner becomes the resist.
On photosensitive boards, the resist is bought on the board, and is
exposed, developed and then etched.
Harvey
>
>Thanks
>Joe
>
>On Sun, Feb 19, 2012 at 1:00 PM, Harvey White <madyn@...> wrote:
>
>> ∗∗
>>
>>
>> On Sun, 19 Feb 2012 16:11:21 +0000, you wrote:
>>
>> >On 19/02/2012 15:57, Harvey White wrote:
>> >
>> >>
>> >> For the quantities of board I use, if I had access to good
>> >> photosensitive board in the sizes I need, I'd use it. That is, if it
>> >> were cheap enough. I can get (locally) single sided 0.23 inch PCB
>> >> which is ideal for making double sided boards. For some reason, I
>> >> seem to make double sided more than single sided.
>> >>
>> >
>> >Nearly all mine are single-sided.
>>
>> I do things like LCD display drivers, microprocessor boards, stepper
>> driver boards, sensor interface boards, etc. Not a lot of analog
>> wiring, mostly digital.
>>
>> I dislike jumpers, so the effort of making a separate layer is often
>> worth the added step. Since my main techniques involve thin board
>> epoxied together to make a dual sided board, I effectively make two
>> boards to get one, but I can remake the "bad" one easily.
>>
>> Last run was 10 board sides, two stepper motor drivers, breakout board
>> for a PCB drill, back panel for same, and a power distribution board.
>> You pays your money.... etc.
>>
>> >
>> >> My problems in photoetch are not the developer, nor the exposure (made
>> >> a vacuum frame and use an enlarger timer), but the density of the
>> >> positive. Neither the laser nor the inkjet seem to do quite a good
>> >> enough job so far. Exposure therefore is tricky. I do miss kodalith
>> >> a lot.
>> >
>> >As I've said several times, I get excellent positive transparencies with
>> >a cheap HP 9540 inkjet printer and JetStar Premium film.
>>
>> I'll have to try that, and see if JetStar Premium is available here.
>> That's when I start in with the photoetch, of course.
>>
>> Thanks.
>>
>> Harvey
>>
>> >
>> >Leon
>>
>>
>>
>