Boss FA-1...TC dual parametric eq

[Music]

Hi, anyone got the schematic of the Boss FA-1 fet amplifier and TC eletronics dual parametric eq?, im lookin some of The Edge's classic tone stuff..
Thanks and happy new year.

[MartyMart]

http://www.ustomp.com/index.html?menu=2&section=2

Here's the FA-1, have not seen the dual para anywhere !

MM.

[alfafalfa]

A short time ago I found the TC Electronics Par eq manual:

Here you can see it:   http://www.esnips.com/web/avanluijt-Pictures

Alf

[Music]

Thanks, anybody has built any of those circuits?
I've note that the layout for FA-1 it's incomplete, i found this schem http://www.schematicheaven.com/effects/boss_fa1_fet_amp.pdf, it seems to be complete, anybody?.
Bye.

[Mark Hammer]

You can also look here for some similar types of pre-amp/EQ circuits, for comparison purposes: http://experimentalistsanonymous.com/diy/

Look under the OOP Japanese Electronics Book directory.

[ustompsteve]

In what way is the layout incomplete?

--Steve

[Mark Hammer]

I think perhaps he means that, in relation to the more typical Boss pedal with all the switching circuitry, it just seems like kind of a conspicuously spartan schematic/circuit.  Of course, carve away all the switching and buffer stuff from a great many Boss and DOD pedals, and they can get pretty darn simple too.  I suppose if E-H had ever used FET switching for their early pedals, or if MXR had used it for the Dist+, we'd be looking at schematics of the "pared down" circuits and feeling a little uncomfortable with the seeming "incompleteness" of those circuits too.

[ustompsteve]

The FA-1 was in the circuit all the time. It didn't have any switching except for the filter circuit.

I uploaded the schematic from the original Boss Service Manual. That is what I did my layout from.

I swapped a modern dual op-amp in place of the original in-line units. I don't think that should affect the tone at all.

In fact, in my opinion, this thing doesn't really have a tone of it's own. It is a very clean boost w/ tons of gain.

--steve

[Mark Hammer]

*I* knew that, and *you* knew that.  Not everyone does, though.  Indeed, there have been many things over the years that were always in-circuit and never switched out.  My old MXR 6-band had no bypassing of any kind whatsoever.

[okgb]

Can't see the dual eq schematic there ,
I had the whole manual which they had sent long ago ,
turned out the sanded off i,c, was a common quad
now all i can find here is the pcb layout !
anyone ?    gboboski at shaw dot ca