Emma - Reezafratzitz [ goop-alarm ]  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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roseblood11
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Post by roseblood11 »

Does someone have a veroboard layout, esp for the new version?

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kupervaser
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Post by kupervaser »

Built this thing last week.
Didn't work in the first place, but later on I spotted a connection between traces due to a bad etch. After the fix it started working. Everything works well, sounds great, however i consistently wired all of the 4 pot meters backwards.

Here are some pics and will post some sound samples later.

Image
Image
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kupervaser
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thn.technik
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Post by thn.technik »

Hi guys,
I do it again hehehe... it's my new THN Reeza :D
Housing it's a box from USB stick, no foot switch bcoz is always standing at top of amplifier( BTW it's my own production, ECL86, 3W for home use)
I found 2 pcs OKI MSN4069RS IC in my old video recorder, its work much better than MCY74049 which I use before, so I change it also in my old Reeza, now is clearly difference in bias potentiometer.

REEZA_THN2_1.jpg
REEZA_THN2_2.jpg
REEZA_THN2_3.jpg
REEZA_THN2_4.jpg
BTW I get question about potentiometer names, so once again schematic with descriptions
THN_Reeza_Desc.JPG
And my small and simply amplifier 8)
THNTechnik4.jpg
DSC01419.jpg
Regards!

P.S.
Don't waste you time and build your own THN Reeza, it's great fun with this box :thumbsup

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soonerrob
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Post by soonerrob »

Ive built 2 of these from the THN project... 1 from the THN pcb layout and one of my own from the THN schematic... both circuits are dead.

both audio signal die at pin 1 of IC... not sure what is wrong.

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thn.technik
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Post by thn.technik »

soonerrob wrote:Ive built 2 of these from the THN project... 1 from the THN pcb layout and one of my own from the THN schematic... both circuits are dead.

both audio signal die at pin 1 of IC... not sure what is wrong.
PCB image is in mirror, so maybe try to turn up/down your IC 4069,

notice also that you need to have UB - unbuffered version of CD4069

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soonerrob
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Post by soonerrob »

OMG... you're absolutely right technik.....

Hope I didnt fry my IC. :)

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soonerrob
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Post by soonerrob »

Reeza is workin great.. thanks Technik... the IC was reversed. fixed.

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Nicht Bernd
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Post by Nicht Bernd »

thn.technik wrote:I found 2 pcs OKI MSN4069RS IC in my old video recorder, its work much better than MCY74049 which I use before, so I change it also in my old Reeza, now is clearly difference in bias potentiometer.
Hi,

do you know where to buy the OKI?

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thn.technik
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Post by thn.technik »

Nicht Bernd wrote:
thn.technik wrote:I found 2 pcs OKI MSN4069RS IC in my old video recorder, its work much better than MCY74049 which I use before, so I change it also in my old Reeza, now is clearly difference in bias potentiometer.
Hi,

do you know where to buy the OKI?
Hi, I have no idea where you can buy it, I just disassemble my old AKAI tape video recorder.
BTW all parts in my second Reeza are from this recorder :wink:

I find only one shop with this part:
http://www.accordtech.com/4069RS.html

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Throbb7
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Post by Throbb7 »

I have used the 74HCU04 14 pin chip in distortion circuits designed for the 4049ube and they work very well. I'm not sure if the pins match up. ;)

http://pdf1.alldatasheet.com/datasheet- ... CU04N.html

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Post by XoB »

thn.technik, why you won't use of classic fender of marshall tonestack. If we'll take kind of fender tonestack we'll get more mids deep & possibility to get some freq distribution

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thn.technik
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Post by thn.technik »

XoB wrote:thn.technik, why you won't use of classic fender of marshall tonestack. If we'll take kind of fender tonestack we'll get more mids deep & possibility to get some freq distribution
main problem with "classic fender" tone stack is that if you put 10V RMS at input then you get 1V RMS at output, so you need to do x10 amplifier for signal.

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Post by biliousfrog »

I just wanted to gloat a little - bought a mk1 for £40 inc. postage. Sounds great so far, really looking forward to cranking it through a decent tube amp at rehearsal.

It seems very well voiced, the tone control (just one on this) is perfect at 12 o'clock, same with the volume and bias...in fact I'd be happy just running everything at noon.

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Post by IvIark »

Forgot to post this:

Image

Modified version with additional Bass and Mids controls:

Image
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Post by Nefi_fatobene »

Nice Job Guys!!! :applause:

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Post by asatbluesboy »

Loved the "circuit window". Why don't ALL pedals have that? Would save us a lot of trouble... :mrgreen:
...collectors together and emitter to base? You're such a darling...

ton.

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Post by juozasu »

mictester wrote: The original Emma board is MUCH bigger - and now you can see why.
The problem is not that components are close to each other, but it has a very problematic ground. PWR GND and SIGNAL GND, there is no "star GND" point.

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Post by TubeHugger »

here's mine.
my first etched PCB.
and second wrong IC mirroring :slap: (its on the back of the board)
did the thn.technic layout.
man it was dark sounding.
changed the low pass filter after the tone control and voila
it sounds great now.
i used 470K pots instead of 500K.
could this make a big difference on the sound? :scratch:
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regulardrive1.jpg
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Post by commathe »

That bias control is interesting. Is it just starving the op-amps and preventing them from amplifying the whole wave properly?

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