beavis's huminator vero layout

[pinkjimiphoton]

i made this layout as small as i could, hoping it may help someone else wishing to run some of their homebrew pedals off a wart...if it hums really bad, this may help.



this is designed to be a small add-on board to stash in a pedal...

here's beavis's page for it

http://www.beavisaudio.com/projects/Huminator/index.htm

props to beavis, and dino for pointing it out to me!! 

[HOTTUBES]

Has it been verified to work from this vero

[darron]

Has it been verified to work from this vero

i think it's simple enough to trust....

do you mean, has it been VERO-fied?


...gold... that's pure gold and you know it!




if i built this i'd use the biggest caps that could fit... IE a 100/220nF NP cap, or even 1uF. And a 220uF if you can (:


R1 would have to be tailored to suit the circuit depending on current draw.



ALSO... to be a bit more pure i'd take "to board-" from row E to minimise earth resistance and noise issues. of course you only need one earth connection to the board and will star ground the circuit anyway.

[pinkjimiphoton]

thanks for the tip, darron...

gonna try and add this to my bobtavia today. no it's not "verofied"...yet..

you guys are killin me!!

lol

i can understand using a bigger electrolytic, didn't know r1 should be varied. would a small trimmer work better? i just went with the stuff on beavis's page.
thanks.

[darron]

well the way that i understand it, the more current you draw on the other side of this circuit the more voltage drop you will get. 100ohm is a safe bet to shave off some mV but if you wanted to just clean up your whole pedal power supply and daisy chain it then it might be a different story.

to be purist the carefully selected metal film would beat a carbon trimmer.

sorry... i feel stupid for butting in so much last night.... ignore me.... how can someone have so many opinions on a 6 component board.

i did look over the layout though and it should work really well for those skeptics out there...

[pinkjimiphoton]

thanks for the explanation bro...you weren't butting in, i appreciate every thing i read here, cuz it takes me a little farther down the road to understanding all this stuff.

i haven't had a chance to touch the bobtavia yet...too many gigs this week. hopefully come saturday or sunday i can sit down and fire up the iron.

have a good one bud!

[Yorick]

I just made the layout and cramped it in a 34 x 16 x 24mm abs box. (with female input en male output lead and a 5mm led  )
Works like a charm but not for my whole pedalboard. THe voltage drops to about 1 volt if I plug in my Behringer Tube Monster.
What resistor would you suggest instead of the 100 ohm to run this properly?

[pinkjimiphoton]

it's cuz you're drawing too much current, i'd imagine...try running just the rest of your pedals on it, and the behringer by itself?

i built it into the bobtavia...nuked about 60% of the hum and crap...the rest is probably lead dress that i need to attend to one of these days.

so yes, the layout is VEROFIED...lol..the only difference between my layout and reality was i put all the grounds on the bottom strip of vero.

works really well for noisy lines, but like yoric said, it may need some tweakage depending on what your requirements are.

that sad...alas, poor yoric, i have no idea!

R.G.??

[Yorick]

Ah it doesn't really matter. I made it just for the sake of it. My Tube Monster gets rid of all the hum (and clicking of my tremulus lune) anyway.
I Think I'm going to build them in every pedal from now on.

[pinkjimiphoton]

me too...to have that much less noise it's worth the couple extra parts!

[darron]

we can use goodold ohm's law to calculate the resistor value. how much current would you try to draw if you ran all of your pedals?


oh. and i was just thinking. another reason not to use a pot is that if you wipe it too close to the 'zero' end you can draw too much current through a tiny strip of carbon taper and damage it.


think of the current draw of your pedals as a load. putting it in series with the 100ohm resistor 'divides' the voltage. if for example you had a 900ohm load from your pedals and the 100ohm resistor you'd have a total load of 1Kohm. the voltage to your pedals is divided and will only see 90% (900ohm out of 1000ohm)


so how do you calculate the load of your pedals?

R=V/I

Where R is ohms, V is volts, and I (current) is amps

so, let's say you have a 9V power supply and all of your pedals are drawing 100mA

R=9/0.1

R=90ohm



So if you put your 90ohm pedal load through the 100ohm filter resistor then you'll only be left with about half of the voltage.


But, if you had a simple fuzz that was drawing say 5mA

R=V/0.005

R=1800



So 1800 + 100 would be a total load of 1900'

your pedals get 0.947 of the supply voltage now.... so 8.52 V from a 9V supply. no worries. this filter though i think was designed for non-regulated transformer style ACDC adaptors so the voltage will probably already be higher than 9VDC

[pinkjimiphoton]

damn, darron, i actually understood that...thanks man!!