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I like to place a sacrificial wide line around the entire design. Many times the line will fail to transfer/etch but the rest of the design will be perfect.
Well how about an educated guess... Everything about ultrasonic cleaners is optimised to focus all the power on removing stuff from surfaces... It may not be the best agitator for an etchant tank.
The way i etch PCBs is to put the board in an approx 10x3inch icecream box(plastic) about 3 inces thick.Pour hot(electric kettle for best result) water on it, some chunks of FeCl(even this is hard to get where i live).Close the lid and move the box like a see saw so as to make the etchent flow on the surface to and frow. Gives a PCB with in 2 to 3 minutes. Cheap and easy.
P.S. About toner transfer DIY paper, I am going to test the heavy duty wax paper used by butchers; have not got any yet. I am also going to test the bag that some breakfast serials comes in.
You are a man on a mission . I would tell you not to bother because all these things have been tried, but the the composition of the coatings may have changed since anyone gave them a shot.
Please don't be offended and take this as constructive criticism.Here my first try at it I think it came out very well all but the bottom ground.
I did, I just didn't understand it.MrDEM said:Someone didn't catch the phrase old copper
Seriously, have you been drinking colloidal silver?reusing a old used board IMHO it looks pretty good.