Revv - G3 [traced]

[Leder]

Hello, I disarmed my G3, desoldered pots and switch with the idea to figured out the schematic, but some help never hurts, so im here sharing this! If somebody want to help i would appreciate that.

This is what i read from the smd parts:
D3: R17 egk23
Op amps: TL072
D1 & D2: LED
Q1 & Q2: A7
Q6: 2CW5N

I think Q1 & Q2 are the diodes BAV99. But i dont know what is Q6!

I dont rearm the pedal, so if someone ask for more detail photo i can do it.

[guiddruid]

https://www.pedalpcb.com/docs/PedalPCB-Tyrian.pdf

[arivabox]

A transistor goes to the volume of pin 2, is it a buffer? Is it not on the PCB scheme, or is it a different version, a new one?

[jhergonz]

the Q6 is Bc849, and its Collector is connected in the Pin 2 of volume potentiometer, and the emitter is connected directly to ground.

it may act as muting circuit to avoid POP.

In the other side of tje board, the Pin 2 of the Volume potentiometer os comnected in the pad going to the footswitch

[Leder]

A transistor goes to the volume of pin 2, is it a buffer? Is it not on the PCB scheme, or is it a different version, a new one?

I think the Revv and the Tyrian have some differences. Thats why im disarmed the Revv. But i'd been very busy last week so i cant get to work on this pedal.

[skizoide]

Maybe a new tracing work will help with the squeal problem with the older one.

[bugg]

Q6 is a bypass mute circuit.

I don't think you're going to find as many differences as you'd expect.

The oscillation isn't a widespread problem, I think that was mostly with vero builds?

[jhergonz]

I don't think you're going to find as many differences as you'd expect.

you mean there are some difference between Tyrian and G3?

[bugg]

you mean there are some difference between Tyrian and G3?

The Tyrian doesn't have the bypass mute circuit.

[Dave37LP]

Hi guys, sorry for the bump, I recently had some time to spend developing my own PCB design for the G3, I'm very interested in including the mute circuit as well as all the other details I see that are often left out of most pedals traced out there, I mean, IMO, there are elements in the original circuit that have a reason to be and I don't see why they have to be excluded, as is the case with the bypass capacitors in the power rails of the opamps, for example.

For this reason I want to ask, if it is still possible, to know the value of electrolytic capacitor C32, in the original circuit.
I hope that the OP can still have lateral photos of the circuit where the values ​​of the electrolytic capacitors can be appreciated. I've tried to guess those by looking at other photos of similar pedals, G4 or G2, but in principle they don't usually take that kind of side photos. Excuse me for trying to be a perfectionist. My goal is to replicate the pedal in a 1590b enclosure using a mix of SMD and Through-Hole components, just like the original.

In my country it is almost impossible to get 125b enclosures that I think would be ideal for the G3 and I don't want to use something bigger like a 1590bb. Not to mention buying the pedal itself, importing it is very expensive due to the exorbitant taxes on such devices. I'm a guy on a budget, normally.

I have drawn the complete schematic with the part references of the original unit, from the photos posted by the OP and from the pedalauthority site, I only need to include those values ​​that I mentioned to be able to post it, if there are no objections from the moderators, logically.

I know that versions of other forumites and well-established sites have existed for a long time but they do not include what I require, as well as I have read of many builders that have encountered performance problems, that I suppose have been resolved over time with different revisions and versions. I intend to minimize those complications in my build as much as possible.

Thanks in advance for your help, regards.

Dave

[jhergonz]

Hi guys, sorry for the bump, I recently had some time to spend developing my own PCB design for the G3, I'm very interested in including the mute circuit as well as all the other details I see that are often left out of most pedals traced out there, I mean, IMO, there are elements in the original circuit that have a reason to be and I don't see why they have to be excluded, as is the case with the bypass capacitors in the power rails of the opamps, for example.

For this reason I want to ask, if it is still possible, to know the value of electrolytic capacitor C32, in the original circuit.
I hope that the OP can still have lateral photos of the circuit where the values ​​of the electrolytic capacitors can be appreciated. I've tried to guess those by looking at other photos of similar pedals, G4 or G2, but in principle they don't usually take that kind of side photos. Excuse me for trying to be a perfectionist. My goal is to replicate the pedal in a 1590b enclosure using a mix of SMD and Through-Hole components, just like the original.

In my country it is almost impossible to get 125b enclosures that I think would be ideal for the G3 and I don't want to use something bigger like a 1590bb. Not to mention buying the pedal itself, importing it is very expensive due to the exorbitant taxes on such devices. I'm a guy on a budget, normally.

I have drawn the complete schematic with the part references of the original unit, from the photos posted by the OP and from the pedalauthority site, I only need to include those values ​​that I mentioned to be able to post it, if there are no objections from the moderators, logically.

I know that versions of other forumites and well-established sites have existed for a long time but they do not include what I require, as well as I have read of many builders that have encountered performance problems, that I suppose have been resolved over time with different revisions and versions. I intend to minimize those complications in my build as much as possible.

Thanks in advance for your help, regards.

Dave

i built one using single sided pcb , board mounted pots and toggle and combination of smd and THT. it fits 1590B. No mute circuit tho.

[287m]

Jhergonz, nice! But i think that 125B. Gutshot clue please?
I did in perfboard 1590B, lots of jumper! And deadbug style, still crowded as hell.
maybe time to move on smd, hahaha.

[jhergonz]

Jhergonz, nice! But i think that 125B. Gutshot clue please?
I did in perfboard 1590B, lots of jumper! And deadbug style, still crowded as hell.
maybe time to move on smd, hahaha.

nope, that's 1590B.

[jhergonz]

still possible to be done using thru hole components, but double sided pcb is a must.

[jhergonz]

The secret is proper planning.

[Leder]

Hi guys, sorry for the bump, I recently had some time to spend developing my own PCB design for the G3, I'm very interested in including the mute circuit as well as all the other details I see that are often left out of most pedals traced out there, I mean, IMO, there are elements in the original circuit that have a reason to be and I don't see why they have to be excluded, as is the case with the bypass capacitors in the power rails of the opamps, for example.

For this reason I want to ask, if it is still possible, to know the value of electrolytic capacitor C32, in the original circuit.
I hope that the OP can still have lateral photos of the circuit where the values ​​of the electrolytic capacitors can be appreciated. I've tried to guess those by looking at other photos of similar pedals, G4 or G2, but in principle they don't usually take that kind of side photos. Excuse me for trying to be a perfectionist. My goal is to replicate the pedal in a 1590b enclosure using a mix of SMD and Through-Hole components, just like the original.

In my country it is almost impossible to get 125b enclosures that I think would be ideal for the G3 and I don't want to use something bigger like a 1590bb. Not to mention buying the pedal itself, importing it is very expensive due to the exorbitant taxes on such devices. I'm a guy on a budget, normally.

I have drawn the complete schematic with the part references of the original unit, from the photos posted by the OP and from the pedalauthority site, I only need to include those values ​​that I mentioned to be able to post it, if there are no objections from the moderators, logically.

I know that versions of other forumites and well-established sites have existed for a long time but they do not include what I require, as well as I have read of many builders that have encountered performance problems, that I suppose have been resolved over time with different revisions and versions. I intend to minimize those complications in my build as much as possible.

Thanks in advance for your help, regards.

Dave

Tomorrow or on Saturday i will have time to open the revv and answer your doubt about C32 value!