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/diy/ - Do It Yourself

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>> No.1219244 [View]
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1219244

>>1219216
>Ain't it great how projects grow to fill the available ambition?
Not for me, I never get anything done. But this time I'm limiting myself both in only using local ingredients, and in making everything out of fish cans.

I thought I'd want to dim it for the purposes of both battery life and not blinding pedestrians/drivers, the former being important if it's pulling 5W or so.

555 costs 2.70 NZD, 556 costs 2.40 NZD, so I guess their costs are insignificant when compared to their profit margins. Or they're just fucking with me. Either way I am somewhat trying to avoid large DIPs, and µCs are completely out of the question for me, it just takes the fun of physical engineering and troubleshooting away and replaces it with code-monkeying. I know it's stupid, but making my own primitive 555-style timer from BJTs would be something I am considering, though it's probably far too bulky.

A discrete comparator-based relaxation oscillator could work, which it looks like I might be able to do with only 2 or 3 transistors per oscillator. Since LTspice is working again, I'll give that a shot. Needless to say, spice does not like the reverse-bias BJT oscillator.

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