Menu

Show posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Show posts Menu

Messages - markrocknroll

#1
Amplifier Discussion / HELP: noisy cricket problem
January 09, 2010, 10:52:11 PM
OK, I rebuilt this thing from the ground up.  Did it on a perf board (was on the Radio Shack Board).  Did it real slow and checked each solder as I did it.  I still have a problem.  When the Tone is turned all the way up it kind of sputters.  Kinda like there's a loose connection somewhere (intermitant).  However with the Tone all the way off, it sounds better.  You can get a real sweet spot with the Tone all the way down, Gain rolled off about 50%, Grit swithch on and Volume all the way up.  Also, I don't think it's as loud as it should be.  I have changed out the Tone switch, cap on the Tone pot and retouched every solder joint.  I have also checked continutity of all gound connections.  I have changed out the amp and transistor.  I have check, double checked and triple checked the layout.  I checked everything I can think of. Can someone help?
#2
Amplifier Discussion / Re: noisy cricket gain led
January 01, 2010, 06:47:17 PM
Yeah I built it on a RS IC.  What could go wrong with it.  The traces look good.  I could swap the board because that would force me to redo it and mybe find where I messed it up.

Of course I didn't use sockets.  That would make this too easy. 

I think I may have measured wrong before.  The voltage at pin 6 is 8.9VDC and at pin 5 is 8.0VDC.  Adjusting the volume does changes nothing.  Still this is not working correctly.  When I measure across the speaker I get nothing.  I expected the same reading as pin 5.

I'm starting to think I have no idea what I'm doing.  (I've successfully build 2 tube amps and several stomp boxes)
#3
Amplifier Discussion / Re: noisy cricket gain led
January 01, 2010, 03:07:40 PM
approximately
#4
Amplifier Discussion / Re: noisy cricket gain led
December 31, 2009, 07:04:10 PM
I built the noisy cricket in a cigar box with a 4 inch speaker.  Used the RadioShack IC.  I powered it up and no output.  It's dead quiet, no hum.  Power LED works.  I checked the voltage at pin 5 of the LM386 and got ~8.6VDC.  Adjusted the volume all the way down and got ~7.9 VDC.  I have checked the build against the schematic several times and can't see a mistake.  Is there some troubleshooting steps I should take.  Help.
#5
Amplifier Discussion / noisy cricket gain led
December 06, 2009, 10:31:03 AM
Going to build the noisy cricket.  how do you wire up that dpdt grit switch to the grit led?  is a standard on-on dpdt switch the correct one.