Author Topic: Need help finding a schematic...  (Read 2363 times)

Noplasticrobots

Need help finding a schematic...
« on: February 10, 2006, 06:58:26 PM »
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.
I love the smell of solder in the morning.

H S

Re: Need help finding a schematic...
« Reply #1 on: February 10, 2006, 07:04:47 PM »
Try looking for Crash Sync.

hank reynolds 3rd

Re: Need help finding a schematic...
« Reply #2 on: February 10, 2006, 07:08:46 PM »
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

Re: Need help finding a schematic...
« Reply #3 on: February 10, 2006, 07:31:01 PM »
My project site
Winner of Mar 2009 FX-X

Noplasticrobots

Re: Need help finding a schematic...
« Reply #4 on: February 10, 2006, 10:59:44 PM »
That was it! Thanks a ton!
I love the smell of solder in the morning.

Noplasticrobots

Re: Need help finding a schematic...
« Reply #5 on: February 11, 2006, 12:11:53 AM »
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
I love the smell of solder in the morning.

nelson

Re: Need help finding a schematic...
« Reply #6 on: February 11, 2006, 12:23:58 AM »
The schematic calls for only two IC's. The 555 and a DUAL opamp.

They are both correct.
My project site
Winner of Mar 2009 FX-X

Noplasticrobots

Re: Need help finding a schematic...
« Reply #7 on: February 11, 2006, 11:30:34 AM »
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?
I love the smell of solder in the morning.

nelson

Re: Need help finding a schematic...
« Reply #8 on: February 11, 2006, 11:38:57 AM »
Any standard dual opamp will do and any 555 will do, I think that some are just less current hungry than others.
My project site
Winner of Mar 2009 FX-X

tiges_ tendres

Re: Need help finding a schematic...
« Reply #9 on: February 11, 2006, 01:32:58 PM »
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
Try a little tenderness.

Noplasticrobots

Re: Need help finding a schematic...
« Reply #10 on: February 11, 2006, 10:06:12 PM »
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?
« Last Edit: February 11, 2006, 10:09:29 PM by Noplasticrobots »
I love the smell of solder in the morning.

Noplasticrobots

Re: Need help finding a schematic...
« Reply #11 on: February 12, 2006, 12:30:57 PM »
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?





I love the smell of solder in the morning.

Re: Need help finding a schematic...
« Reply #12 on: February 12, 2006, 12:51:05 PM »
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

Re: Need help finding a schematic...
« Reply #13 on: February 12, 2006, 11:08:48 PM »
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!
I love the smell of solder in the morning.