BJFE - Dyna Red Distortion  [traced]

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TheLemon
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Post by TheLemon »

Where exactly does the "dark" switch apply to in the orginal schematic? Which capacitor- C?

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stanimal08
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Post by stanimal08 »

hey guys,
built this one using NeilNil's pcb layout.... ended up sounding very very good... i knew nothing of BJFE, but now i want to buy and/or build their stuff.... thanks for doing all the legwork here.... now if someone can point me in the direction of where i go to support this awesome site with a donation, let me know...!

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stanimal08
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Post by stanimal08 »

ibodog2 wrote:Jeez, I should have read this whole thread before I did my vero. Anyway, now it's fixed up and verified. I put mods in for the 470pf feedback cap and the 470nf "dark" cap from the original schematic. Also included the log taper treble pot and a 1M log distortion pot. Changing the 470pf cap to a higher value lowers the distortion and mellows the highs. With the stock 470pf there I needed to run the treble most of the way down. With the higher values you can open it up a bit.

veroboard layout with mods is outstanding.... i used it to build another dyna red (i also built one with NeilNil's PCB layout but wanted to try this as well) and it's so amazing i posted a video....



ONE THING THOUGH.... on my build, using the 50kAudio pot for the Tone didn't seem to yield that much of an effect on the overall tone, i swapped it for a 50kLinear and get much more control......

This is a really nice pedal and well worth the build.....

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stanimal08
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Post by stanimal08 »

Very true regarding the 50k audio and treble but i only hear the massive treble when i flip one of the mod switches to brighten the sound, then that tone knob gets twisted down to zero...

here's a pic of my build...

Image

I have to say that after building both designs posted here in this thread this particular build is my favorite.. with those mod switches you get some wonderful tight fuzz better than any Rat pedal i've ever heard...

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picassochild
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Post by picassochild »

Those clips sound different and more fuzzy that my DRD. These clips are better way to get idea of DRD tone.

http://www.soundclick.com/bands/default ... dID=925056

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jhlind
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Post by jhlind »

If anyone can help, I would greatly appreciate it -

I build the the vero of ibdog's drawing. Have checked and re-checked all points. Tried two ICs. Getting the same result - nothing.
I did audio probe. Input is good to pin3 of the IC. That's where it stops.

I have voltage readings on the IC Socket. I am getting 9v at pin 7.

There was nothing said about lug 1 on the DIST pot, so I had it go to ground. Assuming this is right. Does the empty lug on the TONE pot go to ground? It doesn't look like it should, since it's already grounded.

ANY HELP would be appreciated. I REALLY want to get this working.

Thanks in advance.
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jhlind
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Post by jhlind »

ibodog2 wrote:
jhlind wrote:There was nothing said about lug 1 on the DIST pot, so I had it go to ground. Assuming this is right. Does the empty lug on the TONE pot go to ground? It doesn't look like it should, since it's already grounded.
Do NOT connect empty lugs on TONE or DIST pots.
Thank you for your quick reply.
I'm going over vero with fine tooth comb. Hopefully I'll find problem soon.

Thanks again.

PLAY IT LOUD!
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jhlind
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Post by jhlind »

STILL trying to find out why my build of ibdog2's vero won't work.

I've gone from getting NO output to getting output with no distortion.
I CAN see my red LEDs light up when I play through the circuit.
However, none of the tone controls are working.

Any help is greatly appreciated.

j


PLAY IT LOUD (well.....trying to.)
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jhlind
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Post by jhlind »

jhlind wrote:STILL trying to find out why my build of ibdog2's vero won't work.

I've gone from getting NO output to getting output with no distortion.
I CAN see my red LEDs light up when I play through the circuit.
However, none of the tone controls are working.
More info on my circuit that isn't working -

I traced entire board trying to find where sound stops. It doesn't.

I replaced the IC and trannie. Same results.

The distortion pot doesn't do anything. TONE pot does nothing to sound.
Switches do nothing.

I've got 9v going into IC7 and into the drain of the trannie. Voltage at R5 is 2-3V. Wondering if this is too low?
I did change R5 to 330K instead of 360K (using what I have). Would that make a difference?

Any help is appreciated.

Thank you in advance.

(trying to PLAY IT LOUD)
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PLAY IT LOUD!
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Barcode
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Post by Barcode »

jhlind wrote:
jhlind wrote:STILL trying to find out why my build of ibdog2's vero won't work.

I've gone from getting NO output to getting output with no distortion.
I CAN see my red LEDs light up when I play through the circuit.
However, none of the tone controls are working.
More info on my circuit that isn't working -

I traced entire board trying to find where sound stops. It doesn't.

I replaced the IC and trannie. Same results.

The distortion pot doesn't do anything. TONE pot does nothing to sound.
Switches do nothing.

I've got 9v going into IC7 and into the drain of the trannie. Voltage at R5 is 2-3V. Wondering if this is too low?
I did change R5 to 330K instead of 360K (using what I have). Would that make a difference?

Any help is appreciated.

Thank you in advance.

(trying to PLAY IT LOUD)
The resistor value is fine. Are you sure you wired the pots correctly? Since only 2 lugs are to be connected, if you wired up the outside lugs instead of lugs 2 and 1, the pots would become a fixed resistor and no matter where the pot was set you would get the full resistance of the pot.

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jhlind
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Post by jhlind »

Barcode wrote: The resistor value is fine. Are you sure you wired the pots correctly? Since only 2 lugs are to be connected, if you wired up the outside lugs instead of lugs 2 and 1, the pots would become a fixed resistor and no matter where the pot was set you would get the full resistance of the pot.
Thanks for reply.

I checked the pots. I wired up lugs 1 and 2 only.

I'm STILL trying to figure this out.

(still trying to PLAY IT LOUD)
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jhlind
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Post by jhlind »

Would it make any difference if I used a 2N5457 transistor instead of a 2N5458?
The pinout is the same.

tx in advance for help.
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culturejam
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Post by culturejam »

jhlind wrote:Would it make any difference if I used a 2N5457 transistor instead of a 2N5458?
I honestly don't think so. I've used both in Rat builds and I can't tell a difference.

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briggs
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Post by briggs »

culturejam wrote:
jhlind wrote:Would it make any difference if I used a 2N5457 transistor instead of a 2N5458?
I honestly don't think so. I've used both in Rat builds and I can't tell a difference.
In this build you won't notice a difference as the Jfet is set up as a buffer on the end of the circuit to allow a low output impedence (don't want it loading down other fx!). But if the Jfet was set up as a boost you will notice a difference as these statistics taken from the brilliant "Fetzer Valve" article on runoffgroove.com show how different Fets are different;

Out of twelve (12) 2N5457
average Vp: -1.58V (spanning from -1.22 to -1.80)
average Idss: 3.27mA (spanning 1.96mA to 4.11mA)
average Rs: 401 ohms
average Rd: 1607 ohms
average Gain: 2 times or 6 dB

Out of ten (10) 2N5458
average Vp: -2.18V (spanning from -1.74 to -2.87)
average Idss: 5.22mA (spanning 3.62mA to 7.41mA)
average Rs: 347 ohms
average Rd: 800 ohms
average Gain: 1.1 times or 1 dB
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Over Drive
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Post by Over Drive »

I am having an issue with my drive control. It sounds great at about 12 o'clock but anything past that it starts to clip the front end of the amp and trun into a rough fuzz type of sound. I cannot see any bad traces or solder bridges.

Any help would be appreciated.

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Over Drive
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Post by Over Drive »

Over Drive wrote:I am having an issue with my drive control. It sounds great at about 12 o'clock but anything past that it starts to clip the front end of the amp and trun into a rough fuzz type of sound. I cannot see any bad traces or solder bridges.

Any help would be appreciated.
Ha! This is in the wrong thread!

:oops:

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roseblood11
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Post by roseblood11 »

Anyone got the schematic of the 4-knob version?

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Post by tacianocanassa »

Here is my contribution, pots should be soldered on the solder side of the pcb. Not verified!
https://mega.nz/file/OHxEVKhS#awF1XNg2W ... 1S9-IZGric

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Post by sopapo1 »

Helloe, I am buildind this pedal right now, I am using a vero layout of dirtyboxes. https://dirtboxlayouts.blogspot.com/201 ... mment-form
I noticed two things, Its curious that the designer used Electrolytics for a 1 uf, its a value that usually its fitted with a mkt cap etc.. I dont know if there is a reason specific And the other thing its I spotted a suppodsedly diferent valor in the input cap in the original schematic by bjfe (22n vs 47n on the bearfoot). I will try both of course...
http://revolutiondeux.blogspot.com/2009 ... rtion.html

What do you think of this?

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Post by sopapo1 »

I finished this build, sound fine¡¡ but I have a strange behaviour, if i raise the gain, a high pitched squeal appears, but if the pedal is after a buffered effect in bypass is absolutely silent¡¡ . Maybe because it isnt boxed yet is the cause??


Also the output is low compared to other effects and, if i have to say something, the tone could have a little more deepness i dont know if is the character of the design..the clips I see on yt are somewhat lookalike so I think is along the lines..
But the responsiveness and amplike tone live to the hype :thumbsup

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