DeviEver Hyperion: let's tweak it!

[Plexi]

Talking with my mate Kennt82, we have a few tweaks and tricks about this fuzz titan pedal.


I used 2n5088 for Q1, BC550b and 2N2907 on Q2/3.
MPSA13 on Q1 turn it a bit more noisy and fuzzy.

C2 lowered to 47n: which would be the function of this cap? cut off highs?
C3+C4 changed for one 47nf: maybe Devi didn't have any 47n caps.

Kennt suggest to replace the PNP with a 100n cap to get the Ruiner and use 10k stab potenciometer.

[Kennt82]

During the time the company was sold to Dwarfcraft, they replaced the 100n's with 220n's.

Also! that schematic, you will want to only have one 100n coupling cap in the middle, not the 2 in series. There is an updated schematic somewhere.   That was left over from when 2 boosts were united to form this fuzz.

[Plexi]

Sure... added a 156nf cap in the middle.
BTW: I'm using a Big Muff tone stack module at the end.
D*mn...this thing sounds great!

No difference with/without C2

[Ben Lyman]

Sounds great Plexi, nice riiffery too! How about the tone stack values? standard BMP values?

[Plexi]

Thanks Ben! 

The BMTS is less scooped: 10nf/22k in high pass, and 6.8nf/39k on low pass filter.

[Ben Lyman]

Thanks Ben! 

The BMTS is less scooped: 10nf/22k in high pass, and 6.8nf/39k on low pass filter.

cool. Did you ever try the values that Gus turned me onto?
47k/10n and 47k/10n with a B100K pot
I used them in my now completed Acapulco 4-Knob

[Plexi]

Thanks Ben! 

The BMTS is less scooped: 10nf/22k in high pass, and 6.8nf/39k on low pass filter.

cool. Did you ever try the values that Gus turned me onto?
47k/10n and 47k/10n with a B100K pot
I used them in my now completed Acapulco 4-Knob

I will! I left that values on my "to do" list since that thread 
BUT! I check the wave on the ToneStack Calculator, and it's almost identicall: I would say that there's a few more mids on my values.

[Electron Tornado]

Here's an article discussing the BMP tone stack: http://guitarkitbuilder.com/big-muff-pi-mod-more-mid-range-tone/

[Plexi]

I finally built a pair to taste: one extremely scooped (traditional?) and another the most mid-boosted as possible.

[Plexi]

I'm building on PCB now.

Which would be the function of C2?
I remember get no difference with/without it.

[nocentelli]

No idea of the "purpose", but it looks like a low pass filter (with a low frequency, I.e. would roll off most of the high and mid freqs) but without any series resistance, so it's effect is minimal with the large gain from Q1 and Q2.

[Plexi]

No idea of the "purpose", but it looks like a low pass filter (with a low frequency, I.e. would roll off most of the high and mid freqs) but without any series resistance, so it's effect is minimal with the large gain from Q1 and Q2.

I put a 68nf there, like when I built it in the protoboard.
The only improvement I heard is some ground noise 

[wyn]

if this topic is still open ide like to ask a question about the intense pot.
on the version from this youtube vid the control pot works as a starve for the gain and gets nice and sputtery if it gets turned down.

(at1.50)

how can i do this on the version that i posted here?

[patrick398]

I'm pretty sure the 'control' and 'intesity' knobs are doing the same thing no? Just a pot shunting input to ground, has the same effect as rolling the volume back on your guitar.
If you want an actual starve pot it's just a pot or trimmer between 9v and the collectors of some or all of the transistors i reckon. Try replace R2 10k with a 20k pot, see what happens. Probably best to have some kind of resistance in series with that though i guess, so you don't give it full beans

[Plexi]

if this topic is still open ide like to ask a question about the intense pot.
on the version from this youtube vid the control pot works as a starve for the gain and gets nice and sputtery if it gets turned down.

(at1.50)

how can i do this on the version that i posted here?

Cross-posting 
Starve from the + 9v only reduce the gain and gate the fuzz, as I remember.
If you want to make it oscillate, like the Hyperion 2, use a B100k pot, in between the ground from the board to ground (9v jack).
Be sure that no other ground connections are going to the board, or it won't work.

[digi2t]

Try this combo for T2 and T3;

BC546B for T2.
2N5087 for T3.

Gains for both between 300 and 350, match them to within 2 points.

Let me know what you think.

If you want to take things a step further, send T1 after T2 and T3 as a post boost. Use a germanium PNP transistor for T1, emitter to +. Look at the front end of the WOW Fuzz.




Here's some more Devi stuff;

https://drive.google.com/open?id=1Q_jPo48sWZW8J0HjkV3P77wEGZX6eifq

[stan-thomas]

Sure... added a 156nf cap in the middle.
BTW: I'm using a Big Muff tone stack module at the end.
D*mn...this thing sounds great!

No difference with/without C2

It sounds nice. Do you need the C5 cap at the output along with the BMP tone stack, or can that be omitted too?

[iainpunk]

i think you need that cap to keep DC from flowing through the tone control which might cause the pot to crackle when you turn it.
i suspect he also used a make-up gain stage like the BMP has at the end.

cheers

[Plexi]

Sure... added a 156nf cap in the middle.
BTW: I'm using a Big Muff tone stack module at the end.
D*mn...this thing sounds great!

No difference with/without C2

It sounds nice. Do you need the C5 cap at the output along with the BMP tone stack, or can that be omitted too?

i think you need that cap to keep DC from flowing through the tone control which might cause the pot to crackle when you turn it.
i suspect he also used a make-up gain stage like the BMP has at the end.

cheers

Yep! As I've remember, I left that cap there. It's a coupling cap.
I don't remember to used a recovery stage before, but it could be an improvement of course!

[stan-thomas]

I finally built a pair to taste: one extremely scooped (traditional?) and another the most mid-boosted as possible.

And which values sounded the best?