fet boy

Help Support GroupDIY:

BR

Well-known member
Joined
Jun 13, 2004
Messages
723
Location
Florida
Hey Pedro
I got a few on my bench, but haven't got too far yet... to busy with other projects.
Are you using the OEP tranny?? where did you get if from?? I guess they don't have a distributor here in the US.

thanks
Gil
 

louder

Well-known member
Joined
Jun 4, 2004
Messages
370
Location
portugal
alo gil
yes,i`ll use oep,from rs components.
these tranny`s are rather cheap,at rs components:around 14 euros each.
best regards
pedro
 

BR

Well-known member
Joined
Jun 13, 2004
Messages
723
Location
Florida
Hey Pedro,

I remember seeing these trannies for 9 euros on Canford. I may be worth going through them. Would you be willing to buy some for me and ship it? since I can't get them here??. Of course I would send you the money first.

Gil
 

louder

Well-known member
Joined
Jun 4, 2004
Messages
370
Location
portugal
alo gil
no problems:just tell me when,and i`ll send them.
are you in the us of a?.
best regards
pedro
 

[email protected]

Well-known member
Joined
Jun 3, 2004
Messages
999
Location
Oregon, USA
[quote author="BR"]I remember seeing these trannies for 9 euros on Canford. I may be worth going through them. Would you be willing to buy some for me and ship it? since I can't get them here??.
Gil[/quote]

The OEPs are 9.50 pounds at Canford, not Euros, and that is without the mu-metal screen can. The can is another 3.40 pounds (~US$23). Newark carries them in the US and asks $27 for them.
Fabio has made a board, called FETBoy for a preamp similar to the [email protected]@ne FET pre.
I have done most of the stuffing on mine although I am not using the original circuit. I am using the 2N4393 FET instead of the 2N5457, no AC bypass capacitor on the FETs and the entire circuit runs on a single 48V supply.
 

louder

Well-known member
Joined
Jun 4, 2004
Messages
370
Location
portugal
alo
speaking of the fet boy:
what kind of pot,in the schem?:log or lin?.
what kind of sound?apish?;neveish?;maybe fet boyish.
sorry for the stupid questios.
best regards
pedro
 

BR

Well-known member
Joined
Jun 13, 2004
Messages
723
Location
Florida
Hey Pedro,
Log pot is what you need..
and I think it just has a fet boyish sound... but will only know for sure when I hear it..
Did you double check with Canford on those trannies??
thanks
Gil
 

louder

Well-known member
Joined
Jun 4, 2004
Messages
370
Location
portugal
alo gil
the oep`s at rs,cost 14,59 euros each,and the can costs 5,61.
total=20,20 euros.
the price at canford,it`s about the same,plus the shiping from uk to portugal.
i think it`s better to buy from rs,and faster(2 days).
if you think that it`s okay,tell me and i`ll send them to you.
off topic:
today i received stuff from digikey,and i had to pay 75 euros of ups.
i`m still out of breath,and my heart just skipped a beat.
best regards
pedro
 

BR

Well-known member
Joined
Jun 13, 2004
Messages
723
Location
Florida
Wow...
$75 bucks for shipping. what the heck did you ship???? :shock:

I'll get back to you soon about the traffos.. Probably it will be about 2 weeks until I can order it. .


Hey Samuel,
I may have it somewhere, but I have to ask the author for permission first..
I'll get back to you on this later in the week..

take care
Gil
 

Bauman

Well-known member
Joined
Jun 4, 2004
Messages
795
Location
BRASIL
Hey guys!

No secrets here! :cool:

To make it clear: the FETboy is nothing more than my board to [email protected] FET micpre !! :wink:

I just did a mod here and there, but it´s the same circuit.

schemo
http://www.thediypill.phx.com.br/forumfiles/FETboy_sch_rev1.pdf

bom
http://www.thediypill.phx.com.br/forumfiles/FETboyMICPRE_bom.xls

and just to ilustrate

fetboy_quase.gif

almost there (as usual...)

fetboy_rev1.gif

the board


cheers!
Fabio
 

louder

Well-known member
Joined
Jun 4, 2004
Messages
370
Location
portugal
alo
fabio,what are those caps in c2 and c4?they look lyke tantalus.
i put two big polyesters in mine.hope i did it correct.
best regards
pedro
 

Bauman

Well-known member
Joined
Jun 4, 2004
Messages
795
Location
BRASIL
Yes Pedro, :grin: , I did this one with tants. Best thing in DIY is you can do whatever you want, if it sounds right to you, it´s right!

You can fit different sized caps on C2 and C4 footprints...

cheers!
 

Samuel Groner

Well-known member
Joined
Aug 19, 2004
Messages
2,935
Location
Zürich, Switzerland
Thanks Fabio for the clarification. As I see the pics I remember them from another thread!

Has someone tried to change the darlington out to a "modified darlington" (say a 2k resistor from Q2/Q6 emitter to ground)? This arrangement tends to behave better (i.e. reagrding freq. response/speed) than the former.

Samuel
 
Top