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Messages - kin0

#31
Amplifier Discussion / Re: debugging a small amp
July 20, 2011, 09:21:11 AM
I fixed the ground problem and now I have some problems with the electricity.

The red 9v+ (the 9v input to the circuit) get 8-9v, but the blue 9v and the VB get only 0.2v. How can I fix it?

http://imageshack.us/photo/my-images/24/unledjmr.png/
#32
Amplifier Discussion / Re: debugging a small amp
July 16, 2011, 05:51:56 AM
But the input don't touch the ground. Line E which connects the presence trimpot leg to the C3. This line somehow touches the ground and I need to disconnect it from the ground (I can't see any visual connection).
#33
Amplifier Discussion / Re: debugging a small amp
July 14, 2011, 12:56:01 PM
but there is no plastic insulation to melt O.O
#34
Amplifier Discussion / Re: debugging a small amp
July 14, 2011, 10:19:50 AM
Okay I fixed every problem I had except the false connection between E and ground. (Phatt I'll check these things if it won't work after this one).
Is there any connection there to the ground?
#35
Amplifier Discussion / Re: debugging a small amp
July 08, 2011, 09:01:39 AM
I can't unsolder all the components O.O. What I did is to check the connection between each leg, I don't think that a components will do any different.

Here is the new layout. The brown point are all the ground. F is a line which is connected to the ground in every point of it (got 3 components connected on it)

#36
Amplifier Discussion / Re: debugging a small amp
July 07, 2011, 11:30:10 AM
I don't understand what do you mean  :o
#37
Amplifier Discussion / Re: debugging a small amp
July 06, 2011, 04:29:01 PM
the red lines mean that i put the multi meter in the both ends of the line and it made a sound (means that these two points are connected to each other somhow). In several of these point I can see clearly where they are connected but in others I just can't see anything wrong. How can I find what to fix in those that I can detect any visual connections.
#38
Amplifier Discussion / Re: debugging a small amp
July 06, 2011, 11:53:12 AM
I checked if everything on the pcb is connected well. There were some places that have to be connected (not a problem) but there are some places that are connected to the ground while the shouldn't be. I can't find the exact place that they are connected (to know there to disconnect). Here is there I have the problems.

#39
Amplifier Discussion / Re: debugging a small amp
June 26, 2011, 01:05:26 PM
oh crap now I have to look for another problem. Cool smili by the way. ;)
#40
Amplifier Discussion / Re: debugging a small amp
June 26, 2011, 12:26:20 PM
my question was is it important which pair goes forward and which pair backward or not?
And thanks for the other answers
#41
Amplifier Discussion / Re: debugging a small amp
June 25, 2011, 11:38:35 AM
Okay, The 9v really connects there and the part after the 100uf cap is to get 4.5volt but why there is a grounded diode and a resistor between the 9V source and the 9V+?

I checked the parts values and discovered some things.
Instead of 13.3k resistor I got 12k, instead of 27n cap I got 33n, instead of 20n cap I got 22n. Is getting these exact values is very important or is it okay to leave it just as it is?

Also I got mixed with the group of 4 resistors (D1 to D4). In the schematic the upper couple are turning left and the lower couple are turning right, in the pcb the upper couple turning right and the lower turning left. I did it as in the pcb. Is this important that I'll change them to be as in the schematic or it will work just fine if they'll stay as the pcb says.

I need to check the connection on the pcb but first I need to change a battery in my multimeter-I'll check the solder joints on the same time
#42
Amplifier Discussion / Re: debugging a small amp
June 25, 2011, 10:25:23 AM
Okay, I don't really know how this stompbox should be but I decided to check if the schematic the the PCB are the same (after that I'll follow this guide:http://www.geofex.com/fxdebug/newfx.htm)

I have some question:
1. What is the purpose of the red section?
2. Where the 9V (blue) should connect to?
3. All the VB points connect together but what the hell is VB?

#43
Okay, and which chipamp is usually recommended to use for getting about 50-100WATT?
#44
Okay thanks. And do I have yo use a chipamp circuit that were designed for guitar amplification or just any project will do?
#45
Hay, I consider building an SS amp which has the randall rg-80 red channel and a Fet twin as clean. I haven't chose a power amp yet.
1. Can I use any power amp after any preamp or do somethings have to match?
2. From reading Temmu's book I got that a transistor power amps are better then a chipamp but are harder to built. Is the hard work worth it?
3. This question is not really connected but I still ask her: I have a problem with debugging stompboxes. I can't understand how to do it can anyone point to a simple guide?