Flickering LEDs

Anything not specifically related to NBTV, but at least of some technical nature that might be of interest to NBTV members. Items for sale and links to retailers do not belong here.

Moderators: Dave Moll, Steve Anderson

Postby Panrock » Wed Oct 23, 2013 6:17 pm

The EPROM method might be a go-er and it's good to know assistance could be on tap here - thanks! However the brain is very adept at noticing repeating noise patterns even when the re-cycling period is more than ten seconds - I found this once, when I built a sea shore generator using pseudo-random noise. True random is to be preferred, especially if it can be done with only a few components. More anon.

Steve O
Last edited by Panrock on Thu Oct 24, 2013 7:42 am, edited 1 time in total.
Panrock
Green padded cells are quite homely.
 
Posts: 870
Joined: Mon Feb 05, 2007 8:25 am
Location: Sedgeberrow, England

Postby Panrock » Wed Oct 23, 2013 10:48 pm

This seems to do what I want pretty well... even without a low pass filter.

The input noise (coming from that other circuit + an extra transistor stage) is adjustable and currently about 6v p-p.

When the spike intensity pot is set to greatest intensity, this circuit produces very good narrow band (tunable) 'normal' noise too.


Steve O
Attachments
Noise triggered monostable.gif
Noise triggered monostable.gif (9.18 KiB) Viewed 3664 times
Panrock
Green padded cells are quite homely.
 
Posts: 870
Joined: Mon Feb 05, 2007 8:25 am
Location: Sedgeberrow, England

Previous

Return to Off Topic

Who is online

Users browsing this forum: No registered users and 24 guests

cron