I want to build a hack that closes a switch using an optocoupler every 1-100 times a second. I was wondering what module/circuit/ic that could pulse an adjustable signal using a pot. Could someone direct me in what could do that?
I want to build a hack that closes a switch using an optocoupler every 1-100 times a second. I was wondering what module/circuit/ic that could pulse an adjustable signal using a pot. Could someone direct me in what could do that?
Hi Kyle,
That is often done with a '555' ic circuit, see here for examples (and consult the datasheets and google for timing formulas).
Nothing wrong with a 555. Some of the people who use them exclusively seem like moped-ridin' script-kiddies to me. I should have better discretion then to vent my prejudices here, but I am on my first cuppa. Since I am having a hemorrhage of opinion, let me throw in that shabaz is a more-than-competent electronics designer, and provides practical and appropriate advice. Let me show you an alternative with generic parts:
Yes, you are reading the screed of someone who draws schematics with a crayon.
Where did you get a switch capable of 100Hz? Is it a mercury wetted relay?
I'm dating myself. When the 555 surpassed the 741 in sales, the community saw this as a milestone and were aghast.
I can recall three resolutions among the serious hipster design community.
1) Have a novel application or three for the 555 in your design portfolio.
2) Never use a circuit from the 555 datasheet.
3) Include an op-amp on every board, regardless.
Actually the guys who designed the 555 were great, clever guys and the 555 was one of the great design kills of history. I just wish they would have pinned-out more nodes.
Interestingly, a third party figured out how to get it to oscillate 50/50 after it was released. The guys who designed the chip didn't figure that out before it was launched upon the market.