Fairly Low Frequency Random Voltage Generator

[Peter Snow]

Matthew,

You may want to look at the "random" voltage generator from the PAIA
Chord Egg (Encephalo-Gratification Generator). You can find the schemo
on Anders site "Cloned Analog Gear" -
http://omega.tellus.vallentuna.se/anders/.  It uses LM3900 Norton
Op-amps.

Whoops, just re-read your post and you wanted triangle waves - I think
that one generates square waves. You may be able to hack it to produce
triange waves though.  Actually the entire circuit is worth a look -
kinda useless function (random chords) but all the building blocks
(random voltage, VCF, VCA, etc) are very simple and thus really
interesting to me. I'm simple minded... no, that's not right...  never
mind...:)  When I first saw this in Radio Electronics I was going to
build a "minimum parts" synth using those building blocks - never got
around to it though. 

Cheers,

Peter