BBE - Acoustimax  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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apollomusicservice
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Post by apollomusicservice »

For now here are some guts and for few days schematic.
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rcustoms
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Post by rcustoms »

apollomusicservice wrote:For now here are some guts and for few days schematic.
count on me for pcb layout
http://www.rcustomspedals.blogspot.com
guitars,pedals and amps.
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Post by ppluis0 »

Hi apollo,

This is the link to the datasheet of the 20 pins BBE custom chip: http://pdf1.alldatasheet.com/datasheet- ... 2153D.html

Hope the diagram in page 4 of that document helps you to trace this unit.

Cheers,
Jose

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apollomusicservice
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Post by apollomusicservice »

For drawing schematics I use Eagle Cad but I did not find library for NJM2153.
I will make my own simplified circuit for 2153 chip in dip 20-pin package.Tnx

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Post by rcustoms »

apollomusicservice wrote:For drawing schematics I use Eagle Cad but I did not find library for NJM2153.
I will make my own simplified circuit for 2153 chip in dip 20-pin package.Tnx
remember baja or bbe sonic maximizer is part of this new pedal,i thing :hmmm: :hmmm:
http://www.rcustomspedals.blogspot.com
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apollomusicservice
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Post by apollomusicservice »

This morning somebody left this schematic at my front door. :)
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Lani
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Post by Lani »

Does anybody know whats going on with the switches on the schematic??? the pre/post switch, -12dB switch and phase switch have some strange numbering. Then there is the switch coming off the XLR jack that has no label. Any help would be greatly appreciated. Thanks in advance.

Lani

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Post by plush »

Lani wrote:Does anybody know whats going on with the switches on the schematic??? the pre/post switch, -12dB switch and phase switch have some strange numbering. Then there is the switch coming off the XLR jack that has no label. Any help would be greatly appreciated. Thanks in advance.

Lani
Even though the switches have wrong pin group labeling, their purpose is pretty clear. It becomes even clearer after you review the user manual posted on BBE website.
No-named switch is a ground lift, others - pretty obvious.

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Post by caspercody »

I built the gain, and the freq/notch section. I did not add the treble and bass controls. But the output is so low, I have the amplifier almost turned all the way up to hear anything out of this thing.

Any thoughts on why this thing has no output?

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Post by Frank_NH »

It looks like it uses a bipolar power supply (+/- 12V ?). Other than that, doesn't appear be overly complicated.

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Post by caspercody »

Yes I used a bipolar power supply. But should this have at least a unity level output after the freq/notch section?

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Post by ppluis0 »

caspercody wrote:Yes I used a bipolar power supply. But should this have at least a unity level output after the freq/notch section?
Are the dual ganged pot (R7) connected as per schematic ?

Both sections acts as rheostat using only two wires each and must increase/decrease in value at the same time. Perhaps one of these sections is connected bacwards... :roll:

Cheers,
Jose

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Post by caspercody »

I tried just the gain stage by coming off of pin 7 of IC1B and there is barely any signal. Should I be getting a boosted signal at least from this stage?

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Post by ppluis0 »

And what signal level are in IC1A pin 1 ?

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Post by Frank_NH »

The gain feedback resistor R14 seems too small. And what’s with those weird values? Anyhow try 22k - that should give you some gain.

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