anyone built a clone of BiFET FX10

[jasonober]

I was reading reviews of this at HC and like the fact that this clean boost also has a tone control          anyone built something like this    how about with treble middle and bass rather than just tone?    This would be an interesting build too me

[aron]

Take a look at the Colorsound Overdriver. Take that tone stack (or any 2 or 3 band tone stack), put it at the end of any booster.

[jasonober]

thanks for reply aron
this is the boost layout i will use
http://www.generalguitargadgets.com/v2/diagrams/ge_boost_lo_amz_mosfet.gif


this is the layout of where i will get the tone stack
http://www.generalguitargadgets.com/v2/diagrams/guvnor_lo.gif

now my question is at what point does the boost go into the tone stack?   I'm thinking that i will leave boost circuit after the .1uf cap but i'm not sure where i go into the tone stack circuit

anyone have any ideas

[aron]

If you would provide links to the schematics, I would be glad to show you where to put the tone stack.

[Mark Hammer]

Build the Guvnor, but do the following Using Mike Burgundy's schematic linked to from GGG):

Change C1 to .47uf (or 1uf but orient the cap properly).

Change R1 to 10k from 2k2.

Take the two clipping LEDs out.

Increase C3 and C4 (doubling is probably smart).

Change R6 to 100k.

Change C8 to 100pf.

Change R7 to 10k.

Change C9 to .47uf or 1uf (keeping polarity correct).

You may be able to simply omit C14/R12.  They form a lowpass filter around 15.3khz, which I assume is meant to reduce hiss.  Since the gain is substantially reduced from what it was originally (Stage 1 = 46, stage 2 = 68; you do the math), residual hiss is less of an issue.  You can simply go from the volume pot to the output jack.

Voila.  You now have a booster pedal with two cascaded gain stages (x1-11 in the first, and x10 in the second), yielding a maximum possible gain of 110, followed by a 3-band EQ and master volume control.  The pedal should be relatively flat from around 50hz or so out to around 12khz or so, which should be enough for just about any single coil guitar.

The gain of 110 should be sufficient to still provide a volume boost even with the passive loss of the tone control network.  If not, increase R6 up to 150k.  With gain maxed, the sound should still be relatively clean, but my hunch is there might be a hint of dirt.

There, does that simplify your plans?

[jasonober]

thanks mark  does make things easier  

still interested in original idea if nothing else but curiosity
boost schematic
http://www.muzique.com/schem/mosfet.htm

tone stack schematic
http://www.generalguitargadgets.com/v2/diagrams/guvnor_sc.gif

thanks

[TheBigMan]

Not worth it imo.  They are still dirt cheap.  There's an FA-1 layout at ustomp.com though.

[aron]

Yes, take the output from the MOSFET booster after the .1uF cap. Then simply tack on the Guvnor tone stack from the junction of C13/R9, at least that's what I would try at first.

[jasonober]

Not worth it imo.  They are still dirt cheap.  There's an FA-1 layout at ustomp.com though.

not so cheap!  :shock:
[/url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=22669&item=3736073577&rd=1&ssPageName=WDVW//

[jasonober]

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=22669&item=3736073577&rd=1&ssPageName=WDVW

[travissk]

Yeah, the FA-1 is pretty expensive. The FX-10, however was made by DOD (maybe a clone?) and used to run about $30. I believe it's been going up in price, but can still be found for around $50 - others might know the price better. From what I hear, it's one of those bargain DOD pedals that sound great and are relatively inexpensive because so many people won't touch DOD with a 10-foot pole.

[aron]

The FX-10 is really good. I used to use mine a lot before I could make pedals.

[cd]

The FA-1 anf FX10 are nothing but simple op-amp amplifiers with tone controls (FA-1).  It astounds me how many people are duped into paying so much for so little!

[aron]

The FA-1 anf FX10 are nothing but simple op-amp amplifiers with tone controls (FA-1).  It astounds me how many people are duped into paying so much for so little!

I have no idea what other people are paying, but I got mine for $15 and it was totally worth it at the time.

[TheBigMan]

I did mean that the FX10 was still pretty cheap. I just sold one, it sounds pretty nice but I'm building an FA-1 because I need a little more control than just a tone knob.

[Ben N]

I never even saw an FA1 before, but I like the belt/guitar strap clip.  Getting it close to the guitar probably accounts for a lot of the benefit--no cable loading and better S/N, like an on-board preamp but without the surgery.  I've got an FX10, and it's a great little booster, very transparent, cost me under $20 about two years ago.
Ben