Boss FA 1 fet amp

[trescat]

With the Boss FA 1 fet amp layout at--
http://ustomp.com/index.html?menu=2§ion=2
it doesn't give any part number to Q1 in the diagram, can someone please sugest what a suitable fet transistor could be used for this circuit,and what type of IC is the 4558??Also here is a link to the original schematic -- http://www.8bitsindgenug.net/BossFA_1.png
Thanks in advance

Cheers
Trevor

[Gilles C]

2SK246-GR

Lower right of the schematic for the FET

Replace with any low noise high impedence FET like the J201 or the 2SK30ATM.

[TheBigMan]

Either a 2N5457 or MPF102 will do fine as well.  For the opamp you can use any industry standard pinout dual opamp such as a JRC4558D, LM833, TL072 etc.  I'm using a 2N5457 and a TL072 in mine, at least until I can get a 2SK246.

[petemoore]

Funky...
 What are those rounded rectangles, with spacey lines all about?
 I think I see [?] two types of markings that indicate a node? one black on white, the other a black spot where wires connect?
 Can't be, then the 50k at the top right would have it's outside lugs connected?...dohh, hafta go study some more and see if I can "cypher' it.
 Edit: Yupp, they definitely made it hard [for me] to read...
 What do dashed lines rep.?
 Why do they have a line goes through the pot's sections, and all the way around the schematic?
  I guess if you know how to wire one it's all self explanatory...lol.
 Sometimes I see these old schematics, and wonder why they marked them with such 'cypherz'.
  Please instruct me to re read FAQ if necessary...I'm missing somethings.

[Fp-www.Tonepad.com]

That dashed line represents what's in the PCB and what's outside of it.

White circles mean pads for offboard components.

Fp

[petemoore]

Thanks...that's making sense...

[iq01221]

http://ustomp.com/files/fa1buildetch.pdf
I've yust finished this improved version, and it works very, very nice. A good booster, with a tonestack, and it buffers very well too...

[rockhound252]

HEllo. I have done a layout with a program but i dont know if that correct. Could you see that?¿

[roseblood11]

[Gordo]

You guys don't have to get me anything for Christmas now...this will do.

[roseblood11]

btw: my layout is verified! Leave out R17 or use a higher value, like 2m2.

[J0K3RX]

btw: my layout is verified! Leave out R17 or use a higher value, like 2m2.

Thanks! Does it sound as good as reported? I am probably gonna build this but I will have to draw a board for it... don't do vero  Well, I shouldn't say I don't do it but let's just say that I don't have any vero and tons of copper to etch... I could bread board it too but I am feelin so damn lazy these days.

[Kipper4]

Did you build this joker?
i could do with some help pls

[roseblood11]

I just improved my pedal by adding a voltage doubler (from ebay china...) and a higher grade opamp (opa2604). Really worth it! I used a higher value for the pulldown resistor at the input, but lowered it to 470k (which is the original value). Sounds more "rounded" now