Once the idea of how the circuit operates is understood, you can design everything else around that principal.
The negative wire is soldered to the negative terminal on the battery holder. The same wire is then soldered directly to the negative leg, that’s the short leg on the IR.
Two separate pieces of wire are necessary for the positive connections. The first end of the positive wire is soldered to the remaining terminal on the battery holder and the other end of this wire is soldered to the switch, it doesn’t matter which side of the switch you do this. The final piece of the positive wire is soldered to the other side of the switch then soldered to the positive leg of the IR, the long leg.
- Diagram of IR, switch and battery placement
These are my photos of my 2nd IR pen, built 17th Jan 2010.
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- Solder wire onto negative terminal
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- Terminal placed into pen
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- Terminal slots inside pen
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- Solder wire to positive terminal
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- Switch placed into barrel
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- View of switch inside
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- IR nib in place
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- Positive to terminal & switch
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- + and – to IR
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- IR nib wired up
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- IR pen complete
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- Test IR with camera
