The homebrew substitute is mercifully cheap and easy to build, though — a momentary DPST toggle switch is partially gutted, with a length of nail substituted for one of its poles.

[Patman2700] has a nice scope for his paintball gun that uses a red dot instead of cross-hairs. The problem is that he kept forgetting to turn it off which ended up running the batteries down frequ… ...

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This is how the electronic toggle switch circuit works! During the initial power up, T1 remains in off state and C3 is charged up enough to turn on T2. When the momentary push switch S1 is pressed, ...