Need help finding a schematic...

[Noplasticrobots]

Hi all, about a week ago I was trying to find out how to combine a guitar signal and a 555 signal output timer and I came across a simple circuit and a hand drawn schematic calling for a 555 and a TL702 op amp. Inititally I didn't think it'd be of much use to me; but now I need it. Anyone know or seen what I'm talking about? I believe the description said it would give some synth like sounds. I've been Googling like crazy but to no avail! Any help would be appreciated.

[H S]

Try looking for Crash Sync.

[hank reynolds 3rd]

I think ,going off what you described,it's the crash sync ....
Try the search,I think there's a couple of layouts already done...

[nelson]

http://www.hollis.co.uk/john/

[Noplasticrobots]

That was it! Thanks a ton!

[Noplasticrobots]

One little thing...the schematic calls for two ICs, but the component layout only has one. Which one is correct?


Component layout: http://www.hollis.co.uk/john/crashsynclyt.jpg

Schematic: http://www.hollis.co.uk/john/crashsync.jpg

[nelson]

The schematic calls for only two IC's. The 555 and a DUAL opamp.

They are both correct.

[Noplasticrobots]

d'oh! Will a Rat Shack TL082 suffice? http://www.radioshack.com/product/index.jsp?productId=2062594&cp=&kw=dual+op+amp&parentPage=search

One more question: is the 100k pot connected to pins 6 and 7 of the 555 bridged?

ok....I've actually got one more question: what's the deal with LP555, NE555, LM555. I know they're all timers, but will using a different prefix cause major differences?

[nelson]

Any standard dual opamp will do and any 555 will do, I think that some are just less current hungry than others.

[tiges_ tendres]

Any standard dual opamp will do and any 555 will do, I think that some are just less current hungry than others.

a cmos 555 will be what you would want in reagrds to needing less current

[Noplasticrobots]

Anyone have a cleaner schematic for the Crash Sync which indicates what pin numbers to connect components to? The component layout doesn't have pinouts on it either, so I'd kindly appreciate anyone's help in deciphering the schematic!

http://www.hollis.co.uk/john/crashsync.jpg

Also, the two grounds aren't connected. Is this just how the schematic is drawn or do they need to be kept seperate?

[Noplasticrobots]

I was hoping to work on this when I get home from work, so please excuse the bump. I compared the schematic to the TL082 datasheet and I think I found the correct pin numbers. The numbers are small, but they're on the graphic. Can anyone verify the validity of this?

[Connoisseur of Distortion]

i'm pretty sure that people were having trouble with that schematic. One of the Hollis schematics, anyways...

I have the Torchy Vero layout, if you want it. Just PM me, and i'll email...

[Noplasticrobots]

I knew some people were having trouble with one of Hollis' layouts also, but I didn't think it was the Crash Sync. This sucks, I have all the parts but no idea where anything goes on the TL082. All dressed up and nowhere to go!