Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "Peter Johansson" <peter@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, March 10, 2005 7:22 PM
Subject: Re: [Homebrew_PCBs] Re: bubbler - more even spread of bubbles


>
>
> Phil writes:
>
>> I'm thinking of going to a mechanical agitator to move the board up/dn
>> but have no idea if it will work well. I figure something around 100
>> hz to start with.
>
> I'm a newbie to the group. The last time I etched a board was perhaps
> 20 years ago masked with an etch-resistant pen. I've been mostly a
> software guy since then, but I'm getting back into hardware as a
> hobby. So, my appologies in advance if this is old news...
>
> Here's a thought on agitation: Find a gear motor that runs somewhere
> arround 30 RPM. Mount a disc perhaps 2-3 inches in diameter with an
> offset center to the motor. Mount underneath one edge of the tray.
> Might something like this do the trick?

Something like that was in the ARRL Handbook a few years ago. A heat lamp
mounted above the etchant container kept the solution hot.

Leon