92Views11Replies

Author Options:

Where do i solder to make a switch on this? Answered

im making a camera coil gun, and i have a kodak funsaver, but the charging switch is a button. its a piece of curved metal with three points that hit three pieces of metal on the PCB. and to turn the switch on you push it so a bump on the curved metal hits a center piece of metal on the PCB. i removed the button but i dont know where to solder the wires to. The button is held on with tape, so i just removed it, and im confused where to solder. if someone could copt the image and show me a highlighted area to solder to that would be great

11 Replies

user
PKM (author)2009-01-30

As per my Instructable (and if it's not in there it should be):

I found that the charging button latches the circuit into charging mode and you can't stop it charging after a flash without removing the battery. I suggest: solder a piece of wire across the charge button contacts (one of the outer square ones to the inner circle), and wire the switch in series with the battery to the battery contacts. This means you should end up with

+ ------=[_AA_]-----o_o------ -

In order: positive battery contact, battery, switch, negative battery contact. (Sorry for the poor ASCII art)

I can't see the battery contacts on your photos but they are where the battery used to clip into the camera case.

Select as Best AnswerUndo Best Answer

user
Plasmana (author)2009-01-29

You solder one wire to the circle center pad and the other wire to any three little square pads, they are all the same.

Select as Best AnswerUndo Best Answer

user
um0123 (author)2009-01-27

okay, but what i was thinking - please critique it as it will help me - was to just take a normal on/off switch, and solder then to the points, on would star the charging process, and its not momentary, so i can leave the switch on and walk away for a minute. and there will be a second connected to the coil, with the capacitors, this will allow me to charge is to any point, and hold that charge until i flip the other switch - which may or may not be momentary - and it iwll shoot

Select as Best AnswerUndo Best Answer

user
Sandisk1duo (author)um01232009-01-28

you want to put a switch in series with the capacitor?

Select as Best AnswerUndo Best Answer

user
11010010110 (author)Sandisk1duo2009-01-28

switch 1 (500 mA) is what caitlinsdad or i said caitlinsdad uses a momentary switch. you push it to start charging and it continues after you release i use 1 - 0 switch that is charging in 1 and not charging in 0 the fire switch should be connected between the coil and the capacitor / charger (the capacitor is connected to the charger all the time) you want to use big switch here (atleast 16 A one) so that it won't weld in the closed position after some use

Select as Best AnswerUndo Best Answer

user
um0123 (author)110100101102009-01-28

but there are two switches, fire and charge, which one is should be rated at 16 A and what should the other one be? i have two 10 A lying around, but i can just go to radioshack and get another one.

Select as Best AnswerUndo Best Answer

user
11010010110 (author)um01232009-01-28

it depends on the power of the gun and quality of the switches. 10 A may be ok the fire switch has to be big. the charge can be about everything

Select as Best AnswerUndo Best Answer

user
11010010110 (author)2009-01-27

alternatively you can solder them together and put a switch in series with the battery. this allows you to stop a started charging too

Select as Best AnswerUndo Best Answer

user
caitlinsdad (author)2009-01-27

You should be able to take a regular switch, momentary - normally open type and solder one lead to the center round pad. You can then take the other switch lead and connect it to any one of the three square pads. The circuit "trace" connects all three so it doesn't matter which one you attach to. The Button switch on the camera probably had three prongs or legs to just lift off the center part of the one piece metal or foil bubble. When you press, the bubble flattens out and you complete the circuit. Good luck.

Select as Best AnswerUndo Best Answer