I built this on stripboard;
http://www.hollis.co.uk/john/crashsync.jpg
It sounds great apart from at the end of the (extremely sustained) notes where it breaks down into a fart and then silence. Has anyone else built this and come across the same problem? Is it supposed to do that? I've not boxed it up yet, it has just been connected to my test rig and I've tried it with batteried from 8 to 9.5v. I used a low power 555 as recommended, a TLC555CP and a LM1458 as it was the first dual op-amp I came across in my box. The sound after the op-amp is fine so I don't think it's that.
Mine sounds best above the 12th fret where I can get some really amazing and unusual sounds, i would just like them to be more useable.
No, that sounds about right. Once your signal gets low the tracking dies...I added a commonsound LFO and a footpedal socket to my build control the sweep, which added greatly to the fun.
Chris
Sounds like mine does. I added my DIY frequency sweep controller to mine using a clothes pin, LED and LDR and a 1 quarter of an upside down mini bread loaf pan (light shield). Check out the sound samples.
This may not be a useful pedal to use professionally but for fun it's a blast.
http://randallbarnett.homestead.com/files/crash1n.jpg
http://randallbarnett.homestead.com/files/crashs1.jpg
http://randallbarnett.homestead.com/SoundSamples.html