fo-SHO booster

[rullywowr]

This is my first official 1590A build.  I gotta give credit to all those who jam complex circuits in these tiny enclosures.

Etched face plate on black copper clad and finished with clear coat.  Powder coated the enclosure with dormant sparkle red followed by a clear coat.  Camera is not really great at catching how much it actually sparkles.  Finished with a 3mm blue led in a Frensel lens from Mouser. 

And while pedal building is usually pretty safe...I almost killed myself when I went to drain the air compressor and tugged on the hose accidentally.  This resulted in an immediate large rush of air and the regulator shattering on the way to hiting the ceiling!  Kind of cold in the garage I suppose for the cheap cast regulator part.  Yikes.   



Here she is:

[selfdestroyer]

That knob and face plate look great.. Man I love that knob. (I'm sure our friends on the other side of the pond will like that line) lol

[jubal81]

Love that ensemble. Looks perfect together. My Fo-SHOs should be here this week. First order of business is replacing the board in Bubba Fet. Great layout!

[lincolnic]

This looks awesome, but I was kinda hoping that you'd use the broken piece in the first picture for the knob!

[rullywowr]

Thanks for the kind words.

This looks awesome, but I was kinda hoping that you'd use the broken piece in the first picture for the knob!

Now that's an idea!  Hmm...what effect can I use that knob for.

[rullywowr]

My Fo-SHOs should be here this week. First order of business is replacing the board in Bubba Fet. Great layout!

Just saw this..It is an honor to have one of my layouts in the Bubba Fet!  Awesome implementation and epic build right there.  Thanks man!

[copachino]

i got this 3 set from OSH PARK and seems quite amazing, how do you manage to stop the plop sound??, i cant see the pull down resistor in you builds, its on the 3pdt board?

[rullywowr]

i got this 3 set from OSH PARK and seems quite amazing, how do you manage to stop the plop sound??, i cant see the pull down resistor in you builds, its on the 3pdt board?

Thanks man, hope you enjoy them.  You are right, there isn't a RPD (pull down resistor) on this circuit.  If you look at the schematic, R2 (10M) should bleed off most of the voltage which resides in the circuit to help prevent pops.  I haven't had any issues with popping on this guy for what it's worth.  If do you however experience popping, you can simply attach a 1M resistor to the input of the circuit to any ground point.

[pryde]

Sweet build rully

I have only done 3 1590a builds but quickly decided that was enough torture 

[GammaFlex]

Very cool! the nameplate for me is the coolest part. Although I wish that you had used that broken knob for something, maybe put a label under it that reads "Dream" you know, broken dreams.. whatever lol

Nice job!

[copachino]

i got this 3 set from OSH PARK and seems quite amazing, how do you manage to stop the plop sound??, i cant see the pull down resistor in you builds, its on the 3pdt board?

Thanks man, hope you enjoy them.  You are right, there isn't a RPD (pull down resistor) on this circuit.  If you look at the schematic, R2 (10M) should bleed off most of the voltage which resides in the circuit to help prevent pops.  I haven't had any issues with popping on this guy for what it's worth.  If do you however experience popping, you can simply attach a 1M resistor to the input of the circuit to any ground point.

you are right, that look like 5M ohm impedance to me, me lower at max settings, and should be more than enough to cut the poppings, have you used 18v??, looks like the 9v in your pad its blank so maybe feeding at 18V??

[copachino]

making some maths, impedance its not 5 MOHMs as everybody says, its about 3.3m ohms at minimum, and at max its about 150K, this can be very interesting, remember that 10MOHm, its not grounded, but tied to an inverted copy of the input voltage, this helps a lot.

[copachino]

just finish my build nd damn, you sure this its a booster??, it really feels like an overdrive, i have only change the pot, for a 1k pot, i didnt have a 5k C, but it cleans nice, and you can always use the guitar volume to lower the gain...

[rullywowr]

just finish my build nd damn, you sure this its a booster??, it really feels like an overdrive, i have only change the pot, for a 1k pot, i didnt have a 5k C, but it cleans nice, and you can always use the guitar volume to lower the gain...

Yup, it's a boooooster.  The 1k pot probably is making it even louder and more touchy than normal. The 5kC reverse audio taper seems to tame the beast.  SHO is really great for kicking a tube amp or other pedal right in the twig.

[jimilee]

Man that's awesome. I have 2 succesful builds and 1 the in and outs are backwards, apparently they do things differently in Canadia. *cough cough grindcudtoms bazz fuss cough cough*