Baja BBE Sonic Stomp

bajaman · Post by **bajaman** » 10 Aug 2008, 20:25

But just one minor note: Isn't the diode oriented wrong in the layout ?

NO - the + refers to the "band" (or anode) end of the diode. It is orientated correctly

Bloody diodes

- next time I am just gonna draw the diode with the band on it - hopefully no more confusion.

cheers
bajaman

MadHatter · Post by **MadHatter** » 11 Aug 2008, 07:19

bajaman wrote:
But just one minor note: Isn't the diode oriented wrong in the layout ?
NO - the + refers to the "band" (or anode) end of the diode. It is orientated correctly

Bloody diodes - next time I am just gonna draw the diode with the band on it - hopefully no more confusion.
cheers
bajaman

Isn't the "band" the negative/cathode side ? Dear me, the little things we stumble over.. Anyways, this is all in the margin. Marvelous effort and thanks for *all* your projects!

bajaman · Post by **bajaman** » 11 Aug 2008, 10:26

Isn't the "band" the negative/cathode side

No - it is the anode

Don't worry though - I was drawing LEDs the wrong way around until Analogguru pulled me up on it!!!

bajaman

IggY · Post by **IggY** » 27 Aug 2008, 12:01

bajaman wrote:
Isn't the "band" the negative/cathode side
No - it is the anode
Don't worry though - I was drawing LEDs the wrong way around until Analogguru pulled me up on it!!!
bajaman

You should write a correction to the Wikipedia, then!

Further learning here:
http://www.opamp-electronics.com/tutori ... _03_01.htm

bajaman · Post by **bajaman** » 27 Aug 2008, 20:13

Further learning here:
http://www.opamp-electronics.com/tutori ... _03_01.htm

OH dear

The band is the cathode - what a terrible faux pas.

Thanks IggY for bringing this error to my attention.
My convention has always been to draw the end with the band as the + end.
This signifies the direction and flow of positive current in the circuit.
On the diode symbol the + end is the end that the stylised arrow symbol points to - this is rightly termed the cathode not anode as I earlier infered.
To make matters more complicated, the current flow referred to actually flows in the oposite direction, as an electron is a positively charged particle

In the diode symbol we have a stylised arrow pointing to a straight line (the end with the band on the physical diode).
It denotes the DIRECTION of positive flow from the anode to the cathode - the anode is connected to the POSITIVE terminal and in this case the diode is said to be forward biased and consequently passes the positive current through the cathode to the rest of the following circuit (although for silicon 0.65v is dropped through the internal action of the diode conducting - 9 volts on the anode becomes 8.35 volts at the cathode).
I do hope this explains things correctly.
Once again thanks to IggY for the learning link - I suggest you visit it if still confused with bands, anodes, cathodes, + signs, and current flows.
Cheers
bajaman

bajaman · Post by **bajaman** » 27 Aug 2008, 20:18

Okay - from now on I am not going to put any + signs on my diode symbols on overlay drawings

bajaman

yongki · Post by **yongki** » 21 Oct 2008, 23:35

Gitar--> ds1---> baja sonic stomp ---> fender bassman 50
Sample sound
http://www.fileden.com/files/2008/3/22/ ... 0stomp.mp3
Thx For Bajaman

rohona · Post by **rohona** » 14 Jan 2010, 06:29

Could you please help me. I used a freehand tool to draw a shape that I need to fill in with color. The line is countinuous and it is closed, but I didn't draw it at once. I have used a semicircles and other shapes to draw it. In fact I draw a puzzle piece. So, I need to fill it in. I did try to weld it, to group it or to combine, but still I can't fill it in. Could You please help me

Post by **mxrmxr** » 01 Jul 2010, 20:08

bajaman wrote:
Stick a dual pot in the SVF part and you could make it a little more flexible by having it tuneable.
Now, that is what this forum is REALLY about - a very good mod
......and , how about a midrange tone control level as well - also, it may be a better choice for a very flexible tone shaping control after a distortion stage too.
Food for Thought here
bajaman

Anyone added a midrange tone control to this ? That would be cool.

Which is the final tested schematic for this ? I'd like to build one.

How does it compare to the BBE unit ?

collingtech · Post by **collingtech** » 12 Jul 2010, 16:40

hi

the concept works flawlessly whit guitar , but on bass the process knob dont affect too much the signal , wonder if the 3n3 cap is responsable for this , changing to say 10 nf could bring the frequency range more near on bass freq?
anyone try do some mods on this subject ? thanks

marin · Post by **marin** » 03 Sep 2010, 03:22

Hi Bajaman, I stumbled upon the datasheet of an old Burr-Brown opamp - universal active filter 42 http://focus.ti.com/docs/prod/folders/print/uaf42.html. Its implementation 'inverting pole pair' might be used to simplify Sonic Stomp a bit. A couple of feedback resistors and small caps are hardwired in it which I should compensate for. The opamp page has a link to a calculator

@collingtech if you google up a RC calculator, see what freqs it gives with present components and than for bass aim for half of that.

Moonibopper · Post by **Moonibopper** » 15 Oct 2010, 19:01

Quick question to anyone... what does the E stand for the on the pcb layout? Is that ground?

Also, can someone help with the wiring on the right side of the pcb layout? I'm used to wiring power from the pcb to the anode of the LED and the cathode of the LED to lug 8 and having lug 5 wired to ground on the pcb if the dpdt was oriented as

1 2 3
4 5 6
7 8 9

This seems very different.

Thanks!

bajaman · Post by **bajaman** » 15 Oct 2010, 22:07

what does the E stand for the on the pcb layout? Is that ground?

yes - E for Earth

cheers
bajaman

DrNomis · Post by **DrNomis** » 16 Oct 2010, 01:20

Hi Bajaman,

I don't want to sound like I'm being a bit pedantic or anything like that,but aren't electrons Negative in charge?,or am I wrong about this?....

There are two conventions when indicating electron flow in an electronic circuit,one is where the current flow is from Positive to Negative,and the other is where the flow is from Negative to Positive (which was found to be actually the case).....

DrNomis · Post by **DrNomis** » 16 Oct 2010, 01:53

Other than that,this project looks really interesting,I'm going to have a go at building one of these soon....

Cheers Bajaman....

DrNomis · Post by **DrNomis** » 16 Oct 2010, 02:12

The two current flow conventions:

Conventional Current Flow,Positive to Negative....

Electron Flow,Negative to Positive....

But really,it doesn't make much difference which current flow convention you use when analysing a schematic,provided that you keep using the same convention throughout the analysis.....

DrNomis · Post by **DrNomis** » 17 Oct 2010, 03:41

Head,

Your build looks really cool with those cream-white pointer knobs,how does it sound in practice?.....

HEAD · Post by **HEAD** » 18 Oct 2010, 09:13

DrNomis wrote:Head,

Your build looks really cool with those cream-white pointer knobs,how does it sound in practice?.....

Like a BBE Sonic Stomp, what else?

No seriously, it does what it is supposed to do as an enhancer. Meanwhile I did rebuild the whole thing using madbeans smaller layout which fits perfectly into a 1590B.

It's the stompbox labeled "pressure chamber".

Helge

DrNomis · Post by **DrNomis** » 18 Oct 2010, 09:31

I'm seriously thinking of building one for myself Head....

Post by **mxrmxr** » 02 Dec 2010, 08:55

mxrmxr wrote:
bajaman wrote:
Stick a dual pot in the SVF part and you could make it a little more flexible by having it tuneable.
Now, that is what this forum is REALLY about - a very good mod
......and , how about a midrange tone control level as well - also, it may be a better choice for a very flexible tone shaping control after a distortion stage too.
Food for Thought here
bajaman
Anyone added a midrange tone control to this ? That would be cool.

Which is the final tested schematic for this ? I'd like to build one.

How does it compare to the BBE unit ?

Bump.

Baja BBE Sonic Stomp [documentation]