Pawel traced two units with the second being slightly different, using BC109 transistors, the 100K Q3 base resistor is 150K, the 5n cap is 3n3, and all pots are 100K log, so build whichever one takes your fancy, or socket the positions to try both.
Demo of the British Pedal Company Doubler which is a copy
Working voltages as posted by ξεναγός νεκρόπολης:
q1
e 1,11
b 1,65
c 3,95
q2
e 3,49
b 4,02
c 9,08
q3
e 0,56
b 1,16
c 3,55
q4
e 0,21
b 0,78
c 7,82
without review?
ReplyDeleteI can't find any video demos or manufacturers info so unless anyone can point me in the direction of where I can find any, we're stuck with a Foxx Tone Machine comparison
ReplyDeleteI'm sure it's slightly different, but British Pedal Company compares their 'Doubler' to the CBS Arbiter version. There's a bitchin' video on their site. Sounds great.
ReplyDeletehttps://www.youtube.com/watch?v=Mvzo09CYskE#t=284
DeleteCheers guys
DeleteWow! Thanks for this one, I just wish the dude in the demo would have used the neck pickup with the tone rolled down for some of the demo LOL
ReplyDeleteI like the fuzz tones of this pedal and the upper octave is there for sure... very nice!
Amazing how this pedal is almost spot on to the foxx tone machine pedal. I have always wanted to make one of those pedals so I may have to make both and toss the one Ilike least in the sale bin :)
ReplyDeleteVerified!
ReplyDeletejust build it and it worked perfectly from the first moment! ok...the first attempt was with no transistors...it happens to everyone!
anyway. it's working great, all pots have a good use range.
i didn't use a stomp for the octave switch. i've used a toggle one..
i don't have any bc549 and i have only 3 bc109.
so i've put the bc550 's , witch work really good with this.
thanks mark
you are the man!
Awesome matey, thanks for verifying :o)
Deleteworking voltages
ReplyDeleteq1
e 1,11
b 1,65
c 3,95
q2
e 3,49
b 4,02
c 9,08
q3
e 0,56
b 1,16
c 3,55
q4
e 0,21
b 0,78
c 7,82
How to wire up dpdt for octive
ReplyDeleteIn case anyone cares, I have an original Doubler circuit board that I built a new enclosure for.
ReplyDeleteThe transistors used are BC173, which are pretty hard to find, but it is a high gain, low noise Silicon NPN transistor. So the BC549 should be a great replacement, unless you care to spend $5 for each transistor.
My original Doubler has all A50K pots in it, even the Sustain pot, and the 5n cap should be a 3n3 cap.
If I get a chance, I will try to trace it.
Built as layout with BC549s. Nice gritty pedal.
ReplyDeleteBuilt it with BC549's matched at about 250 HFE, 4n7 cap for the 5n. Sounds really good, thanks for the layout!
ReplyDeleteAre 10uf coupling caps after sustain and filter pots (lugs 2) necessary if there are the same caps just before these pots? What's the purpose to put these twice? Does DC "get back" into the circuit from a ground through pots by any chance? Also, isn't a 10uf value a bit overestimated? I've seen Wolfshirt used 1uf for coupling caps for this circuit and it seems enough I think.
ReplyDelete