The Powder Toy

plypencil

http://www.kpsec.freeuk.com/555timer.htm

According to this article, you cannot use a resistor for R1 less than 1k. Thus making the maximum speed of a 555 timer 68khz.

But I do not understand what would not work by putting for example a .5k resistor in with a r2 of 5k. Does it do the chip damage? Or is it something to do with the time it takes to discharge?

I hope I havent just sounded like a complete idiot :P
Ply.

lolzy

Hold on. Let me get my book.

ief015

lolzy:

Hold on. Let me get my book.

It's ok, it's a forum, take your time.

lolzy

Im not sure. What are you making?

lolzy

The timing is determined by Capacitor 1 and Resistor 1
T= C x R

plypencil

But if I get the smallest resistor I possible can, then have the correct ratio in place for the other resistor. Would the 555 still function at that speed or will there be issues?

lolzy

It would be at a different speed. but i think the circuit should be in proportion. If you want to change the rate of the output you want a different capacitor to be sure. I found that with my monostable circuit.
What are you trying to make?

plypencil

A recreation of the processor unit in The Powder Toy, for real life. Using a 555 timer it would be possible to get it to perform tasks automatically really fast.

lolzy

Wow. I really want to make that now but my electronics kit is at school. :/. Can you send me a diagram of the circuit sometime. Im sure my electronics teacher wont mind me making a processor for my GCSEs.

plypencil

I need to convert all of the logic gates in the design into real life items which I can connect. Problem is I cant even work out how to work out the processor, I cant get it to store a value in the ram. If someone could explaine it to be I would much appreciate it

Wow this is an embarresing start lol

555 Timer Help