I have built a Kingslayer from an etched board. It works but the signal is super hot/distorted. I audio probed the in on the IC and it sounds clean and the right volume. The out on the IC is crazy hot. I have a TLC274CN in there. Got it from Tayda. Just looked at SmallBear and there tlc274 had different letters following the numbers 274...believe it was acd. Is it possible that I ordered the wrong tlc274? Should I be looking at something else?
Sounds like a solder bridge just right off. Have you checked the data sheets yet?
Don't worry about the suffix N on the chip. Like Jimi said: hot IC means either a solder bridge or it is in backwards.
It's an etched board. I'll check for solder bridges.
Voltages might help.
Josh
I'm off today. I'll post layer
Ic1 (TLC274)
1. .52V
2. .48V
3. 1.5mV
4. 9.33V
5. 1.5mV
6. 143.7 mV
7. .52V
8. .51V
9. .51V
10. .63V
11. .52V
12. 81.4 mV
13. 147.1 mV
14. .52V
IC2 (Tl1044)
1. 9.33V
2. 9.33V
3. 1.7mV
4. 2.1mV
5. .51V
6. 8.8V
7. 8.8V
8. 9.33V
I've looked but ashamed to say I can't find info on what pins should have what voltage. I do one of these readings should be close to 18V and there is nothing close:(
The kingslayer is split rail (+9v/-9v), not 18V.
All the audio pins should have 0v, and the V- pin (pin 11) should be -9V. Since you don't have anything approaching -9V, and pin 5 of your charge pump isn't creating the negative voltage, that's your first issue to fix.
So maybe I'm looking for a solder bridge in the part of the circuit near pin 5 of the charge pump?
Thanks BTW. Jon, is the voltage info on the datasheets and I am just being dense?
Here is a picture of the solder side. Looked over it carefully and removed/re flowed a couple spots. Am I missing something? Voltages are still the same.(http://img.tapatalk.com/d/14/02/22/y6ajatu5.jpg)
Looks to be a solder bridge to ground, third joint in- top left corner, dirt pot connection.
dave
Thanks Dave. I'll see if that fixes things later this evening. Good eye. As my momma says 'if it was a snake it'd have bit my head off'
Ok. Have a clean solder joint around the dirt pot connection. I put a guitar signal through it again just for fun. Where I once had too loud and distorted, I now have no output. The signal is making it to the IC at Pin 10. No signal coming out of the IC. Rechecked all my voltages around the IC's again after re flowing some suspect joints but the are all the same as above
Keep at it. Did you look at the layout to make sure everything that is still bridges is supposed to be bridged?
Also I confirmed with Rej on his klon, if you're running buffered out you have to have the stomp connected, BUT If your voltages aren't right, still a bridge somewhere. Does the IC still get hot? Etched boards can be tricky sometimes.
You still need to figure out why you don't have -9V at pin 5 of the charge pump. Time to use the continuity tester on your multimeter and make sure things that are supposed to be connected actually are. It's also possible you fried the charge pump at some point.
MIght help to see the other side of the board as well.
I'm at work Jon. I'll test continuity and post a pic later tonight
I'm a fool sometimes. I went home to take a picture of the top of the board and it hit me. I didn't do a good enough job on hand drilling the copper. (I made the mistake of taping off the copper on top, still can't figure out what possessed me to do so!) I figured I'd just remove the copper around each hole. It took forever. Watched at least a couple hours of Olympics while doing so. I was very careful to remove enough copper and place the components in a way that avoided contact with the copper on top. Obviously the components must have shifted or were making contact from the start. It would explain why I had signal to start with and not now. Might explain why I got negative voltage on PIN 5 briefly and then not. In my head, this complicates things to the point that I should abort, buy a prefabbed Kingslayer and start over. Don't have the heart to etch another one right now. At least I can salvage the pots, toggles, ICs and diodes. At the risk of embarrassing myself I'll post the pic of the top.(http://img.tapatalk.com/d/14/02/23/ugu7a8yt.jpg)
DDAAAAMMMNNN!!! I have never ever seen that before!
Yikes! :)
Thanks for posting the pic!
Josh
That's okay... before regulation almost a 700vdc differential. My first tube project, quite a few years ago.
(http://i216.photobucket.com/albums/cc305/davent/IMG_0151.jpg)
(http://i216.photobucket.com/albums/cc305/davent/IMG_4737.jpg)
dave