1, 2, 4, 8 pulse count generator

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Post Reply
StefanV
Posts: 5
Joined: Mon Aug 16, 2004 1:01 am
Contact:

1, 2, 4, 8 pulse count generator

Post by StefanV » Mon Aug 16, 2004 1:19 pm

I build a simple type of skee-ball game. A wooden ball is rolled into 1 of 4 holes, a switch triggers a pulse generator, it steers a score counter.
My breed board version has quite a few 555's, 74121's and 7400's to generate a train of either 1, 2, 4 or 8 pulses that I can feed the score counter. This way you can see the score add up in steps of 10 (I added a fake 0 at the end). But timing is difficult, as my 8 count pulse train turns out 9 sometimes. (74121 one-shot steering a 555 timer)
Does anyone have a good idea or a schematic for a simple setup that will give me a TTL output of 1, 2, 4, or 8 pulses depending on the triggered switch?<p>Thanks! Stefan V.

dyarker
Posts: 1752
Joined: Fri Aug 22, 2003 1:01 am
Location: Izmir, Turkiye; from Rochester, NY
Contact:

Re: 1, 2, 4, 8 pulse count generator

Post by dyarker » Tue Aug 17, 2004 2:04 am

A 74191 set to count down.<p>Each switch (1 2 4 8) to pre-load a stage of '191.<p>555 set to free run (oscillate). 555 output is your pulses and clk for '191.<p>gate the outputs of '191 so that when all are zero the 555 is stopped. if ANY stage of '191 is one, the 555 runs.<p>the '121 might still be needed to de-bounce the switches.<p>Cheers,
Dale Y

StefanV
Posts: 5
Joined: Mon Aug 16, 2004 1:01 am
Contact:

Re: 1, 2, 4, 8 pulse count generator

Post by StefanV » Tue Aug 17, 2004 5:34 pm

Thanks! I got a 74191 here, let me get back to my breed board.
Stefan

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Re: 1, 2, 4, 8 pulse count generator

Post by Chris Smith » Tue Aug 17, 2004 5:37 pm

4017 divide by 10?

Post Reply

Who is online

Users browsing this forum: No registered users and 58 guests