mstechca
New Member
I have become proficient in making single-sided PCB's using the toner transfer/photographic method. (you know, where you print on a transparency, expose it to a photo-resist coated board, develop, and then etch it).
BUT now I see that some designs are too complex for a single-sided PCB. In fact, I have to be a computer to make complex single sided PCB's, even if it is for an EEPROM or FLASH programmer!
So, now I will have to go for double-sided PCB's, considering I don't want to add soldered jumpers, like a number of you suggest to me.
I checked some websites, and one site suggested that I should drill some corner holes and align my circuit with them on both sides of the board.
I made myself a cheap drill (with a toy motor, and a drill bit sticking out of the center of it, all soldered up). and with it, I have O.K. accuracy. Sometimes, when I drill, the hole isn't 100% straight through, but it is very close. If I drill holes in an unetched board, my drill goes all over the place sometimes.
What I want to do is use my drill and make a double-sided PCB using the photo-transfer method.
Before I attempt to do it, I need to know, what is the BEST way to do it?
I want to do it right the first time, and every time I do it.
and as for exposing, what is the MAXIMUM amount of time a board can wait between time the light source is moved away from the board, and the time it is inserted into the developer?
I ask this because I only have one light source, and I would think it is impossible to do both sides at the exact same time.
and remember, I do NOT have sophisticated equiptment. In fact, I DONT even have an oscilloscope.
so if anyone can suggest anything, I will take it into consideration, and I thank you for it.
BUT now I see that some designs are too complex for a single-sided PCB. In fact, I have to be a computer to make complex single sided PCB's, even if it is for an EEPROM or FLASH programmer!
So, now I will have to go for double-sided PCB's, considering I don't want to add soldered jumpers, like a number of you suggest to me.
I checked some websites, and one site suggested that I should drill some corner holes and align my circuit with them on both sides of the board.
I made myself a cheap drill (with a toy motor, and a drill bit sticking out of the center of it, all soldered up). and with it, I have O.K. accuracy. Sometimes, when I drill, the hole isn't 100% straight through, but it is very close. If I drill holes in an unetched board, my drill goes all over the place sometimes.
What I want to do is use my drill and make a double-sided PCB using the photo-transfer method.
Before I attempt to do it, I need to know, what is the BEST way to do it?
I want to do it right the first time, and every time I do it.
and as for exposing, what is the MAXIMUM amount of time a board can wait between time the light source is moved away from the board, and the time it is inserted into the developer?
I ask this because I only have one light source, and I would think it is impossible to do both sides at the exact same time.
and remember, I do NOT have sophisticated equiptment. In fact, I DONT even have an oscilloscope.
so if anyone can suggest anything, I will take it into consideration, and I thank you for it.