D*A*M - BUZZOTRON  [traced]

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D*A*M - BUZZOTRON  [traced]

Postby beedotman » 30 Jan 2013, 09:27

Bam!

Here's mighty Buzzotron - new D*A*M take on Buzzaround with small changes in circuit:
- 470K bias resistor upped to 680K
- added small 220pF cap on Q1 between base and colector
- cap between darlington pair and Q3 lowered to 2.2uF instead 4.7uF
- 100nF in output section bumped to 220nF
- in some units 10K in output section was changed to 33K for better sweep
- 1nF could be also increased to something between 2n2 to 4n7 for more low end (but I cant' see cap value)
- diffrent values of resistor on Balance pot - 22K to 27K

Trannies are of course rare NKT213 :)

I'm not sure of characteristic of pots, but usually linear could be used with good results.
Some guys recommended 100K reverse log as Sustain.

I got more versions comming - small vero that will fit 1590B and classic tagboard for sure. Will post them later.
For beggining layout using big veroboard.

Here's nice review and samples.
http://retrotonejunkie.blogspot.com/2012/12/dam-buzzotron.html

Enjoy!

Peace!
b
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Last edited by beedotman on 30 Jan 2013, 09:35, edited 2 times in total.
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Re: D*A*M BUZZOTRON

Postby beedotman » 30 Jan 2013, 09:29

Sme pics and gut shot of first Buzzotron.
Truly beaufitul work!
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Re: D*A*M BUZZOTRON

Postby beedotman » 30 Jan 2013, 09:33

And here's another gut shot of red unit (second one) with shown 33K in output section instead standard 10K.
Resistor on Balance pot increased to 27K.
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Re: D*A*M - BUZZOTRON

Postby roseblood11 » 30 Jan 2013, 10:03

Great work!

What about a small version with negative ground and npn transistors? Would be really useful... 2n1302 work great to replace nkt213 and they are easily available.
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Re: D*A*M - BUZZOTRON

Postby beedotman » 30 Jan 2013, 10:05

roseblood11 wrote:Great work!

What about a small version with negative ground and npn transistors? Would be really useful... 2n1302 work great to replace nkt213 and they are easily available.

No problem. Will post later today!
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Re: D*A*M - BUZZOTRON

Postby G5120fx » 30 Jan 2013, 18:03

B.´s back with new DAM Stuff :applause:
Nice work, thx
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Re: D*A*M - BUZZOTRON

Postby beedotman » 30 Jan 2013, 22:50

OK, here it is. Three varations of the same layout (based on D*A*M Fuzz Sound Jr BTW...).
One negative, and two positive layouts with few different component sizes. As filtering 47uF cap can be used radial type easily.
Trannies could be mounted using sockets, so it should be easy to find best sounding trio :)

Peace!
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Re: D*A*M - BUZZOTRON

Postby beedotman » 30 Jan 2013, 23:02

Just last one. I promise! :blackeye
This one is for WIMA or Panasonic film caps with 5mm raster.
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Re: D*A*M - BUZZOTRON

Postby Saruman_ » 31 Jan 2013, 08:20

schematic :roll:
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Re: D*A*M - BUZZOTRON

Postby roseblood11 » 31 Jan 2013, 09:17

Draw it. B. described in the first post, what's different from a buzzaround, and you've got the layout as well. Should take you 5 minutes...
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Re: D*A*M - BUZZOTRON

Postby beedotman » 31 Jan 2013, 09:52

Three minutes in MS Paint using Madbean's Bumblebee schemtic :)
Changes vs. Buzzaround/Bumblebee in red.
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Re: D*A*M - BUZZOTRON

Postby beedotman » 31 Jan 2013, 19:50

schematic deleted - will post corrected one later.
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Re: D*A*M - BUZZOTRON

Postby beedotman » 31 Jan 2013, 20:36

corrected schematic
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Re: D*A*M - BUZZOTRON

Postby Lawnchair » 31 Jan 2013, 22:55

Very cool build and encloseur :applause:
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Re: D*A*M - BUZZOTRON

Postby phibes » 01 Feb 2013, 06:33

Is that a pedalenclosures Prism enclosure? If so, that's the first time I've seen a finished build look smokin!
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Re: D*A*M - BUZZOTRON

Postby beedotman » 01 Feb 2013, 09:13

phibes wrote:Is that a pedalenclosures Prism enclosure? If so, that's the first time I've seen a finished build look smokin!


I think so, but it those bigger ones -Prism II are not made anymore unfortunately :(
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Re: D*A*M - BUZZOTRON

Postby MarkL » 15 Apr 2017, 15:35

Can anybody explain why the 4.7uF off of Q2 was reduced to 2.2uF?
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Re: D*A*M - BUZZOTRON

Postby mictester » 16 Apr 2017, 12:03

Probably because they had a big stock of 2u2 capacitors. It won't make any difference to the sound!
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