duckduckgoose wrote:did you try sixthfloor's suggestion?

edit:

oh actually It's not one wire. It looks like the wire is going from G8 to C8 then there is another wire from b8 to a8.

Yes, I didn't look at the bottom part of the layout. My bad !

Thats what mine sounds like for the most part with the sustain switch engaged... Maybe a small bit less gain. Maybe I'm just expecting more from this preamp than it can give, haha! My sustain switch wasn't engaged though. Here is the layout I used:http://guitar-fx-layouts.42897.x6.nabble.com/file/n...

Does anyone have a sound clip without a boost pedal in front of it so I can hear what it sounds like? Thanks! I just recorded a quick (and crappy) one for you: https://drive.google.com/open?id=1fiZ947q-oVIK6z9Va9C8MiXBmRNj-1sw Strat bridge humbucker, full volume -> Vandal red channel, gain 2 o'cloc...

That's interesting, my 2n5485s distorted quite a lot contrary to both of your experiences. The trouble I had was with the distortion being kind of farty with too harsh highs; as far as I can remember the other transistor types I used led to the same problem. If i remember well, changing the bias vol...

Could the BC547B's be replaced by 2N2222's? The hFE is min 200 for the BC547B and min100 for the 2N2222. Everything else looked to be in the ballpark. Please forgive my ignorance, but how would that affect the circuit? As far as I know, the BC547Bs behave as diodes when their collectors are disconn...

Maybe very stupid question but i couldnt stop myself from asking :) I am gonna use 9v power supply. What's the purpose of "Vbias" labels on the vero board? Really sorry for my question. And thank you for your replies. :) The labels are used as a reminder of which parts of the vero are con...

P1 adjusts the gain of both op-amps at the same time. The "Left side" of the Wiper is the Rfb of Op-amp1, the "Right side" of the Wiper is the Rin of Op-amp2 Rfb = Feedback Resistor, Rin = Input resistor as typically used in op-amp gain equations. That's a smart trick ! Hence th...

Ben N wrote:It's a treble bleed circuit, just like in a guitar, except the effect is in inverse proportion to gain rather than volume.

Thanks Ben, that's a pretty intuitive way to see it

Manfred, great explanation and graphs. It is very nice of you taking the time to do this !

Manfred, here's the rest of the circuit. It's a design from a russian guy; I encountered this type of gain stage in various of his circuits and wanted to know more about how it worked. As you can see, the output of the gain stage is connected to the inverting input of another op amp through a cap an...

Thanks Toneman, I was aware of the geofex and electrosmash articles, they were some of the first resources I read when I started taking interest in guitar effects. I understand well enough a TS gain stage as it is, as you say, very common :D Manfred, C2 = 100n and R1 = 1k5 (roughly 1kHz filter). C1 ...

I think that basically you will have the resistance from the pot wiper to output lug in parallel with R2-C3. As you turn down the op amp gain (and increase the wiper to output resistance), the signal will retain more treble (corner frequency depends on R2-C3). At least that's how I see it. Depends ...

I am stumped as to how this works : https://i.ibb.co/q98xJ82/TV-gain-stage.jpg The diodes ensure the clipping. I guess the lower bandwidth is controlled by C2-R1 as in a TS-like gain stage. When the pot is fully clockwise, the output of the op amp should bypass C3 and R2, making the circuit work jus...

Hope it will work) https://ibb.co/345KD7t https://ibb.co/LPYDQX8 BTW, What resistor could I use to connect bypass switch led to 18v? 5 kOhm will work? And where should I wire "Channel 3" from LED panel? Nice, I hope you'll like it :D Channel 3 from LED should go to pin 3 (green LED ground...

As Henk says. I probably put a 22n cap there myself as I'm pretty sure not having any 20n around ^^

Maybe PN4393 would be a suitable replacement to MPF4393 ? http://www.electrokit.com has some.

I'm having a couple of problems with my build : 1/ When the presence pot is full CW (i.e. 5k pot bypassed by 100n capacitor) there is quite a big drop in both volume and highs. Some high-end fizz is also introduced. I guess this could be improved by placing a small resistor between the (presence pot...

I like this small scrap of wood.. does it affect the tone? Is it a tonewood? :) T. It is actually there for a much simpler reason - the jack plugs are almost entirely made of plastic and the thread is very short, so tightening the nuts destroys them. Hence its either superglue or wedges to hold the...

Baja Reactor rev. 4, fixed gain and volume, always on. I think I've reached my limit in using up space in a 1590A

Very interesting. Where would be this circuit best located on the signal chain? from original post "which can be placed anywhere in your effects pedal chain, but preferably as the last pedal before a solid state amplifier or mixer, daw recording device etc." cheers bajaman No attempt has ...

According to the datasheet, 1N4731 is 4.3V so it should work. 1N4730 (3.9V) would be a closer match though; I used BZX55C3V9 (3.9V).

Welcome, BTW