Homebrew PCBs

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