gigapedia newbie limitation
wp100 said:
Hi Ahmad,
Those boards are looking good !
i used a wrong type of varnish before i solder the components
What 'varinish' were you using ? - you normally only need remove the etch resist just prior to soldering - pure Acetone cleans it off well.
thx wp100
ur help was so important for me to get this result from the first attempt
i did used aceton to clean it off. the varnish is used for another purpose.
varnish is a colorless material used to insulate armature windings of motors ( or other conducting parts). and to protect the copper from humidity and air preventing the formation of copper oxide.
i took some from my friend and it seems that i took the wrong type. it was heavy and didnt make it easier to solder. a good type of varnish will act as a flux and make the solder process easier.
i read those info in a site and i m not sure about it. correct me if this is wrong.
Added after 10 minutes:
codewiz said:
great job Ahmad. Congrats!
Added after 14 minutes:
what did you use to get the greenish background for the PCB. Those pictures are extremely impressive for a first timer.
thx codewiz,
i didnt do anything to the background of pcb. i just etched it with fecl3 and it looked like that. this is its normal color.
any progress on ur side codewiz ?
i m building my exposure box. i read about a new idea to build uv box from an old scanner. and also using its stepper motor to move the uv lights!! which saves some money because i dont need 4 uv lights ( if uv lamps is used ) or 100 uv leds ( if uv leds is used) !! i only need 1 uv light or 40 uv leds to construct a movable plate using the stepper motor of the scanner. a simple pic circuit can control the movment of the plate ( 1cm/min depending on leds quality,luminous ... etc)
i m working on it and i hope i finish it soon
will show u everything after i finish.
good luck