Baldwin-Burns - Buzzaround  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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Alex Frias
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Post by Alex Frias »

I've tried a negative ground version, as I was so short of PNP Ge trannies. I protoboarded this version and was amazed by the results. It happened late at night so I didn't distinguish very well among tranny combinations. I tested it with AC127, AC187 and 2SD30. Then I tried to do a layout for the PCB,. Well, it was made using Paint, you know it's not that pro stuff but I think it works.
BurrBuzzloOK.GIF
BurrBuzzPCBok1.GIF

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graemey
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Post by graemey »

Wow, I just checked this thread after a few days and it's gone a bit mad! What have I started haha! Okay, I am now going to try to take more pics and post them here. I can't see the value of the balance pot (which is basically a vol control) but I will attempt to dismantle the guts of this thing soon, then we will know.
Right... wheres my camera?...

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MoreCowbell
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Post by MoreCowbell »

Just a couple little details to hammer out, but it seems like we're close....

Nice layout Alex...

And Bernardduur...thanks for the quickie review...

You guys care to give a more in depth review ?

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graemey
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Post by graemey »

More pics...
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Buzze.JPG
buzzd.JPG
buzzc.JPG
buzzb.JPG
Buzza.JPG

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Post by graemey »

And again...
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buzzj.JPG
buzzi.JPG
buzzh.JPG
buzzg.JPG
buzzf.JPG

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Post by graemey »

One for luck...
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buzzk.JPG

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MoreCowbell
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Post by MoreCowbell »

great pics...thanks a TON Graemey !

I changed the 47u (DAM) to a 100u (Burns) on the schematic. Clear your cache and it will show up.

Hopefully we can get confirmation on the balance pot value soon.

Where's AG ? He's been "conspicuously absent" during this. It would be nice to have him double check the schematic.

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royaltoots
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Post by royaltoots »

great photos - i feel like i could lose myself in that last one!

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Post by Solidhex »

Oh no!

The Burns Buzzaround Schem finally! Now my list of pedals to build is gonna get longer than my netflix queue.

--Brad

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Post by remork »

quick sidenote-
thanks for confirming AG's statement about the Elka being near identical to the buzzaround!!
wouldn't have known how to, even based on those DAM pix..
and getting out of hand is lovely.

@Royaltoots: aren't handdrawn schems the coolest? they got personality- personality goes a long way 8)

totally impressed here.. thanks to all

kris

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Alex Frias
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Post by Alex Frias »

Well... There was a missing 15K resistor, so I think I have it fixed on the folloing drawings
BurrBuzzloOK2.GIF
BurrBuzzPCBok1.GIF

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Post by royaltoots »

Image

delivered today - should be buzzing around later :D

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Alex Frias
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Post by Alex Frias »

I built the layout above and it seems to work properly. At least, I loved the sound of it.

A sample recorded in a non proper way, but it can show at some extent the power of the beast. The first part of the file shows the fuzz at full through an amp simulation that ZOOM insists to be a model of Clean Fender amp. Hummmm...
The second part uses a Crunched Plexi (as ZOOM try to convince us) just to see how good it can be with so different set ups.
Fuxxaround1.rar
(789.89 KiB) Downloaded 344 times
A problem I perceived, at least in my perverted version, is the use of the "Balance" pot. Because it plays an obnoxious function. So, Mr. Graemey can comment a bit about it in the original version. If it is used in a low position, the signal sounds a bit gated, reminds me of misbiasing tranny,. So I needed to set it very high to achieve a normal behaviour. It is not so dynamic as a FuzzFace, but it cleans very well using the guitar volume control. I think I will set that "Balance" pot internally, in a form of trimpot and do some kind of regular volume output control. I don't know if it will have any side effect on the filter response.

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frank.clarke
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Post by frank.clarke »

I enjoyed the soundclip, thanks. You could wire the "Balance" knob as SHO-style volume rather than a bias knob.

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Alex Frias
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Post by Alex Frias »

I'm not sure if I really understood your suggestion...
Because my problem with the balance control was about some low setings having that "gating" side effect. If I need a lower level, it will mess with the "sound operation" of the pedal. But it could be just a problem with my version, or even a building mistake still not found. But I really liked the sound and I think this pedal will stay in my pedalboard for sometine...
The SHO crackles when you are dialing the knob, as long as you stop doing it, the thing goes silently.

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frank.clarke
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Post by frank.clarke »

Andrew's schematic will have the Q3 emitter at 0V at one end of the Balance range, so "Gating OK" :).
I meant you could replace the 15k resistor with a pot and have the wiper going to the 2 caps. That would be more of a volume control. But variable gating is good too. I'm surprised it has no volume control. But easy to add.

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Post by royaltoots »

I increased the value of the Balance pot to 47K, with fixed resistor of 15K - it works more like a volume control than just a 'gate' control, but a master volume could be useful too (no space in the cast-off 3 knob enclosure I'm using though). My NKT213s are very hissy - will try some alternatives for Q1 tonight.

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Post by Bernardduur »

I used the quote on the other page as my balance knob

*fixed 10K + 22K pot* was close enough to *fixed 27K + 4K7 pot*

and it did pretty well. Little gating and more a "volume" knob....... although I added a 4th knob on it (volume) to control it even more.
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Alex Frias
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Post by Alex Frias »

I think I will use a regular output level control... and keep the rest as it is, I am in honey moon with this pedal. Finally I tested the 2SD30 and 2SD352 and the lower gain 2SD30 seems to be, obviously the quieter one. But, remember, mine is not the original version, as I have very small quantity o Ge PNP's but lots of (several models) Ge NPN's. As the sound is fine for me, I will keep it NPN, and sharing the power suply with the other negative ground pedals at the pedalboard.

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Post by graemey »

The Balance Pot:

Mine shows a reading of 6k when I measured it in the pedal so 4.7k or 5k is about right.

I plugged in and noticed the following...
Sustain at zero = no sound
Sustain up 15% = Balance not 'gated' and Timbre increases in volume as it is turned to treble side
Sustain up full = Balance 'gated' in lower settings and Timbre still increases in volume as it is turned to treble side
So the Balance control is so-called as it is used to 'balance' the vol fluctuations as the Timbre is used to shape tone.

Ok guys, can anyone help a with a simple question?
If I build a Buzzaround clone, should all the pots be log or lin type?
(Im quite new to electronics)
Cheers!
Graemey

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