Comment

Comment by Roy on December 5, 2013 at 12:52pm

Oh twofinger, assuming P.S. Meaning power supply
Im using the Boss adpt
Like i said all is being tested out on bread board
So wondering if all the jumper wires are picking up unwanted
Signals??? Perhaps? Oh all conections are sqweaky
Solid! Grounds too

Comment by Roy on December 5, 2013 at 12:41pm

Copy that twofinger..... Im using the Boss adpt
I notice when adding cap to the DC hot + going in
To the pin6 signal drops in volume significantly
When i unplug the adpt and use 9v batt
The signal back to normal, volume good
Thanks for replying

Comment by petey twofinger on December 5, 2013 at 11:34am

just a few BLIND suggestions as i am not a pro or expert . try different p.s. , check your connections , especially grounds , try the capacitor in a different spot . on lm386 based chip amps , i have stopped noise with a cap literally ON the chip pins . i think between pin 6 and 8 but ... prolly wrong on that . one spot and boss ps120 are really quiet adapters , just an observation , and good luck .

Comment by Roy on December 5, 2013 at 2:36am

Hi there everyone! I noticed the discussion about the DC adaptor hum interference noise. Well, I managed to throw together the "huminator" from Beavisaudio website.  I really didn't notice any difference filtering out the hum. Also when I plug in the DC adaptor it reduces the volume of the sign some what. I notice when I unplug the DC Adaptor the sound is louder with the battery only. Hummmm? anyone know the cause of this? I tried running a 100uf cap and resistor after the DC input jack, but same thing. it decreases the volume some what....... well darn....I'm stumped!!!   please help if you have suggestions or a fix.

Thanks

Comment by Barsymes Cratchnee on November 29, 2013 at 7:35pm

Awesome, thanx for all the info and feedback.   Will look into adding a capicitor across the d/c input jack.  This makes a lot of sense.

Comment by Jim Dickison on November 29, 2013 at 1:06am

Nice job on the cabinet! Love the speaker grille pattern!

Comment by Jim Dickison on November 29, 2013 at 1:05am

Yeah... I'd try a fairly large value capacitor across the DC input jack... on the order of 100 to 500 microfarads -- make sure you watch the polarity of the cap.

Another possible fix: Add a 9VDC regulator after your DC input jack. 

Comment by Chuck Cobillas on November 28, 2013 at 1:16pm

Erik, I also added a capacitor across the dc input jack on one amp to help filter out the ac component but don't remember what value. I will look it up when I get a chance.

Comment by Barsymes Cratchnee on November 28, 2013 at 1:02pm

Here are some pics from my first amp build.  Sorry about poor quality of pics.  Will have to employ my wife to take some professional photographs, but she charges an arm and a leg.  First time I've used a protractor and a compass since high school to get the speaker grill pattern.

Comment by Barsymes Cratchnee on November 28, 2013 at 12:44pm

Awesome, Thanx Chuck.  I'll try out some different adapters and plug into some different circuits around the house.  You have at least given me hope.

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