Catalinbread - Naga Viper

Tpetty5 · Post by **Tpetty5** » 06 Dec 2011, 17:23

PCB layout by Mysticwhiskey is verified. Board will fit upright and width wise in 1590B. Thanks for the layout.

harmaes · Post by **harmaes** » 19 Aug 2012, 10:22

I've built the Naga Viper with the circuit from Mark here:

It's working great, I've swapped the 500k range pot for a 100KB which suits me better.
I'm using a breadboard with a Millenium bypass (2) switch to test circuits and the strange thing I noticed is that after switching off the Naga Viper (which I connected on the breadboard for input/output/9v/grnd only) the led light of the MB board lights again after about 1 second. It remains lid.
So in bypass mode somehow the mosfet is not switching correctly? I've never seen this with other circuits.

What might be causing this?

Tx!

p.eat · Post by **p.eat** » 19 Aug 2012, 12:05

Hi,

I think it has to do with the fact, that the Circuit(at least following the layout) has no pulldown resistance on the output capacitor. So when your circuit is in bypass the MB2 still sees the charge in the output capacitor.

p.eat

harmaes · Post by **harmaes** » 19 Aug 2012, 12:27

p.eat wrote:Hi,

I think it has to do with the fact, that the Circuit(at least following the layout) has no pulldown resistance on the output capacitor. So when your circuit is in bypass the MB2 still sees the charge in the output capacitor.

p.eat

Thanks! That indeed seemed to cure it.

Placed a 1M resistor over output to ground and the led goes off. So how does that work in simple terms.

Axe_34 · Post by **Axe_34** » 25 Aug 2012, 15:19

harmaes wrote:I've built the Naga Viper with the circuit from Mark here:

It's working great, I've swapped the 500k range pot for a 100KB which suits me better.
I'm using a breadboard with a Millenium bypass (2) switch to test circuits and the strange thing I noticed is that after switching off the Naga Viper (which I connected on the breadboard for input/output/9v/grnd only) the led light of the MB board lights again after about 1 second. It remains lid.
So in bypass mode somehow the mosfet is not switching correctly? I've never seen this with other circuits.

What might be causing this?

Tx!

I used this layout and it works great. I like the sound better than my original Viper.

Didn't have a 68n cap so I wired two 33s in parallel and I replaced the 40uf with a 47uf.

And hooked up to my handy dandy test box. Lets me test the circuit before I box it up. Makes troubleshooting a million times easier.

Time to order a nice shiny enclosure from Pedal Parts Plus.

jimosity · Post by **jimosity** » 31 Aug 2012, 13:05

I built this from the vero layout and it has a very thin (in a bad way) tone.
Instead of using the 40uF, I used 47uF but I wouldn't assume that would cause the issue.
edit: Instead of a 68nF, the closest I had was a 57nF as well..
I've gone over it a couple times and continuity tested to make sure there were no solder bridges, all checks out fine.
I've tried a TO-18 and TO-92 package 2n222a.
What else can I be missing ?
Two of the controls work in reverse which leads me to believe that something is wired backward, but I've tried switching 1&2 to 2&3 on one of the pots and 2&3 to 1&2 to the other - didn't really help.

Nocentelli · Post by **Nocentelli** » 31 Aug 2012, 17:16

jimosity wrote:I've tried a TO-18 and TO-92 package 2n222a

Just checking this is a typo: the circuit requires 2N2222 - a silicon npn. It would probably work ok with most common si npn transistors, I think mine's actually got a BC109c in it. With the specified 500k range pot, I found i had to turn it a good long way before the boost became anything fatter than a treble boost: maybe this is the issue? I've swapped it in mine for a 100kB pot and beefed up the input caps to something like 6n8 and 680n.

Blend · Post by **Blend** » 11 Sep 2012, 11:36

Pending confirmation of the values from Aegert, I traced and built.
To my taste it sounds more nasal and incisive a Rangemaster, excellent coupling with the CB30 revisited in "Galileo".

D-Day · Post by **D-Day** » 04 Nov 2012, 20:07

Thanks for the fine tracework guys! I just got one of these going on the breadboard and I like it quite a bit

kittycaster · Post by **kittycaster** » 05 Nov 2012, 22:16

heheh

jaybeemusic · Post by **jaybeemusic** » 09 Nov 2012, 15:06

Just a quick question...what would be the tone change if I used a 2n2 cap instead of using a 3n3 cap. I don't have a 3n3 handy...and I've got the rest of it built already.

thanks a Bra-zillion!!

Jacques

Lucifer · Post by **Lucifer** » 09 Nov 2012, 15:37

If you had two 2n2 caps in parallel, instead of the 3n3 and 1n2, you would be pretty much bang on.

Aeroblus · Post by **Aeroblus** » 17 Apr 2023, 13:10

Hello everyone! I need your help. I am new to DIY pedals. I made the Naga Viper pedal from this diagram and it doesn't sound at all.
I used all the components shown on the board and the PCB was exactly made like this.

Do you have any idea what could be wrong? Thanks!

Manfred · Post by **Manfred** » 17 Apr 2023, 14:03

Aeroblus wrote: ↑17 Apr 2023, 13:10 Hello everyone! I need your help. I am new to DIY pedals. I made the Naga Viper pedal from this diagram and it doesn't sound at all.
I used all the components shown on the board and the PCB was exactly made like this.
Do you have any idea what could be wrong? Thanks!

Please post pictures from both side of your board and also of the wiring.

Aeroblus · Post by **Aeroblus** » 19 Apr 2023, 12:37

Manfred wrote: ↑17 Apr 2023, 14:03
Aeroblus wrote: ↑17 Apr 2023, 13:10 Hello everyone! I need your help. I am new to DIY pedals. I made the Naga Viper pedal from this diagram and it doesn't sound at all.
I used all the components shown on the board and the PCB was exactly made like this.
Do you have any idea what could be wrong? Thanks!
Please post pictures from both side of your board and also of the wiring.

I got the circuit working, the sound seems to be ok, the potentiometers work fine too. but I have a noise like a pump (I don't know how to describe it) but it is very annoying. This noise happens to me when I'm playing and when I'm not playing. Thanks!

https://ibb.co/Yj2R42X

https://ibb.co/FgcwsqP

https://ibb.co/TqTnjZV

Manfred · Post by **Manfred** » 19 Apr 2023, 23:13

I got the circuit working, the sound seems to be ok, the potentiometers work fine too. but I have a noise like a pump (I don't know how to describe it) but it is very annoying. This noise happens to me when I'm playing and when I'm not playing. Thanks!

How do you power the pedal with DC adapter or with battery?

Aeroblus · Post by **Aeroblus** » 20 Apr 2023, 13:45

Manfred wrote: ↑19 Apr 2023, 23:13
I got the circuit working, the sound seems to be ok, the potentiometers work fine too. but I have a noise like a pump (I don't know how to describe it) but it is very annoying. This noise happens to me when I'm playing and when I'm not playing. Thanks!
How do you power the pedal with DC adapter or with battery?

With a DC adapter

Manfred · Post by **Manfred** » 20 Apr 2023, 18:52

Aeroblus wrote: ↑20 Apr 2023, 13:45
Manfred wrote: ↑19 Apr 2023, 23:13
I got the circuit working, the sound seems to be ok, the potentiometers work fine too. but I have a noise like a pump (I don't know how to describe it) but it is very annoying. This noise happens to me when I'm playing and when I'm not playing. Thanks!
How do you power the pedal with DC adapter or with battery?
With a DC adapter

Try if the noise disappears when you use a battery.
If the noise is then gone, it may be due to the power supply, otherwise perhaps a grounding problem.

Aeroblus · Post by **Aeroblus** » 24 Apr 2023, 12:34

Thanks for the advice. When I'm using a battery the noise goes away, but it's the only circuit that has noise with a DC adapter.
Do you have any idea?
I made two more circuits, a Blues Breaker and a RIFT EL34 from the same website and they work perfectly with the DC adapter.

karul · Post by **karul** » 24 Apr 2023, 14:35

Aeroblus wrote: ↑24 Apr 2023, 12:34 Thanks for the advice. When I'm using a battery the noise goes away, but it's the only circuit that has noise with a DC adapter.
Do you have any idea?
I made two more circuits, a Blues Breaker and a RIFT EL34 from the same website and they work perfectly with the DC adapter.

It's hard to tell when you are not providing any info what kind of a "dc adapter" you are using. Is it regulated, what king of regulation? Is it SMPS? Is it simple dc wall adapter, or for pedal use? You could have make a photo of it, provide detailed info and make it easier for the guys to be more helpful.

Catalinbread - Naga Viper [traced]