Ts808 Troubleshoot

[avc4eva]

Hey guys new to forum but have been lurking for months now 

I built a TS808 from General guitar gadgets as has been working for around a year.
Today however it would turn on but no sound was present, its not the leads, the amp or the guitar as i have checked them all. The LED is on but no sound comes out the amp when the pedal is on, when its off the amp goes back to normal.
I thought maybe it was a bad battery so i plugged into what i thought was a 9V Power supply and the pedal shut down. I then realised the supply was 12v rated at 2A. Silly me. Now the LED doesn't come on at all
What should i do?

[R.G.]

Read and follow "Debugging: What to do when it doesn't work"

[thedefog]

Hey avc4eva,

A 12v 2A Power Supply won't harm a TS. And Higher amperage is always desirable, as a circuit will only draw as much current as it needs in order to work. You only do damage when it is too low and a circuit demands more than what is available (burns up the supply and can damage components too). This usually only happens with digital effects though, due to their higher current draw. Considering the Tube Screamer only draws like 20mA, you have 100 times what you need with a 2A power supply.  On a side note, higher voltage on an overdrive will change the way it operates, giving you more clean headroom. This is why a dying 9v battery sound like it is farting out. Some people like this sound and include mods to alter the supply voltage with a trimmer pot.

The important thing in your case here is the polarity of the supply you plugged in. If you followed the directions on GGG for the power jack wiring, then you need a negative tip power supply for it to work. If that one you plugged into it was a positive tip supply or says "AC output" instead of DC, then you probably fried your 4558 IC, transistors, Diodes, and polarized capacitors in the circuit. If the LED won't come on with a 9V connected, you probably burnt out your LED as well.

If you have a multimeter, check the voltage of that old battery you were using before and make sure it isn't below like 8v. Chances are that your battery was just dead or dying, and it wasn't a high enough voltage to make the circuit work.

[Mark Hammer]

Read and follow "Debugging: What to do when it doesn't work"

+1

And that's not intended as a "Bugger off and leave me alone" reply.  Look up and to your right, and you'll see that there are over 20,000 members (welcome!) and well over 700,000 posts since the last reorganization of this forum.  The forum has been around for well over 14 years, in various incarnations (I have some saved posts from 1997), so the post count is well over a million.  In that time, there are VERY few sources of non-functionality that have not come up before.  The cumulative experience of thousands of people, and tens of thousands of builds, are rolled up into the FAQ and "what to do when it doesn't work" documents.

Whenever anyone directs you to those documents, think of it like someone cutting their grass out front when the 10,000th car pulls up asking for directions to the "new mall".  The person responds "Just continue on this road for about a half mile.  You can't miss it."

[avc4eva]

I checked the battery reading at about 8.7v, it was powering the LED before but wasnt operating, now it wont work at all. I havent used the DC input on it yet so maybe i wired it wrong when i made it and that caused the whole thing to fail now, whats the best way to check if i wired that wrong?

[Mark Hammer]

I find it always useful to keep an unwired plug of every type I intend to use on hand.  That way' I can stickit in the jack and check for continuity between this plug contact and that jack contact.

It never ceases to amaze me just how many alternative contact/pin configurations can exist whn you only have 3 contacts.  I thought I understood mathematics and probability, but apparently.... 

[MikeH]

Follow the protocol here and post your findings:  http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

We need more info to be able to tell you what might be wrong.  Good luck!