Is this a power issue?

[madstayen]

I build the "little angle mini chorus". All went good, till I plugged the sucker in I get sound through, but no effects. And, my Boss PSA 240's light keep flashing ???What could this be? I added some pics. Thanx for help in advance, greatly appreciate.

[madstayen]

I checked for stray connections. Everything checks out, no shorts.

[armdnrdy]

Without spending too much time looking at this...I have two suggestions...okay maybe three.

Post a link to the schematic that you used.
Post a link to the layout that you used.
I know you mentioned that there are no shorts.....but I see a lot of solder splashes! It's the splash that you didn't find yet.
Check for solder bridges.

[GibsonGM]

+1   If your power supply is flashing because there's a short, then there's a short somewhere ;o)

Use a DMM to check for continuity between your power supply connections (from + to - ).  If you have a 'beep' (or zero ohms resistance), then there is a short.  Do this with power supply unplugged from board!   You could also have a short at the chip(s), transistor, and so on.   Solder bridges are VERY common - don't let that discourage you!  Just seek them out and correct them.   A magnifying glass helps, as does using the DMM to test for continuity in places where you shouldn't have it.   

I'm not sure by the pic whether you have the adapter jack wired up correctly, either.  Just another place to look.   And do be sure, before you start debugging, to check the voltage at your Boss unit with NOTHING plugged in, to make sure there's nothing wrong with it....

Next, go here:  http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

[madstayen]

[armdnrdy]

Here are a couple of areas that look suspect in the pictures:



What model number/manufacturer voltage regulator did you install?
Did you check the spec sheet as per the notes in this project?

[defaced]

Is D1 the correct orientation? Stripe should go to +9v in.

[madstayen]

Okay, so I etched a new board. I get sound through, but no effect. I can hear the "swish-swish" of the effect (this is with the guitar plugged in, but not strumming the strings), and as I turn the speed pot it definitely increase in speed, but there is a kind of hissing sound, like white noise, even with the pots turned all the way down. Gets worse when I touch the strings. Oh, b.t.w @ defaced

Is D1 the correct orientation? Stripe should go to +9v in.

You were right, it was the wrong way around. That is fixed now aswell. Any help? Is it possible that I blew the chips with the diode orientation being wrong?

[duck_arse]

if d1 was backwards, it would have shorted across the supply. that's more or less what it's supposed to do, but only when the supply is connected wrong.

[madstayen]

Okay. So this is the pin out drawings of both chips. How do I know how to insert it correctly into the circuit, or is the orientation correct?

[GibsonGM]

The little half-moon scoop shows you the top of the chip.  Sometimes it is just a dot.  You look to the left of it, from above, and that is pin 1.   You ARE using a socket, right??  I'd never try to solder that bugger in!  Sockets mostly have the same kind of mark, and you make sure it is installed right when you solder, so putting them in is easy.   Pics above show none, so you may have to go 'hard ball' and yup, solder them in.  Work fast, the heat can ruin them.  Or order sockets (get 10 each!).    And yes, if you have something wrong, you easily CAN fry chips (how do I know this? ha ha).

If there's no mark on the socket (moot point here), look for the 330K resistor, and the run to the voltage regulator for orientation.  The other end of the chip will go to all those caps, see?   The 2399 looks right in your pic; can't see the 5532 that good, tho.

[madstayen]

Thanx, I ordered new chips and sockets. Rather do it the safe way then.