Mesa Boogie - Throttle Box  [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 »

Pedal excellent for hi gain but also (with gain lower settings) perfect for rock and blues.
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Mesa Boogie Throttle Box.png
enclosure.jpg
both.jpg

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LaceSensor
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Post by LaceSensor »

Looks to be solidly constructed and interesting it includes and inductor.

thanks!

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osiris
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Post by osiris »

Great work on the schematic, thank you. But I don't see S2, which switches the three gyrator tone shapers in and out in the original design. Is this your modification?

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apollomusicservice
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Post by apollomusicservice »

S2 is internal EQ boost/cut switch, on pcb picture placed at bottom left side.

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Dirk_Hendrik
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Post by Dirk_Hendrik »

Like the approach with the fixed gyrator EQ!
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

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apollomusicservice
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Post by apollomusicservice »

For SMD DIY-ers here is my design of pcb. Resistors and capacitors are 1206
package and C (6mm) for tatntalum capacitors. The pcb is suitable for those who
will not install additional EQ boost/cut components on the bottom side but if you wish to add EQ,
both sides are connected with 4 via holes. Of course tantalum capacitors in the picture are not SMD tantalum,
currently I did not had SMD type.
Pdf file contains top and bottom side of SMD Throttle Box. 8)
Attachments
Throttle Box SMD Pcb.pdf
(12.68 KiB) Downloaded 689 times
smd components placement.jpg
top smd.jpg
profile smd.jpg

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roberttomasz
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Post by roberttomasz »

Question. Look at the picture.

Image

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apollomusicservice
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Post by apollomusicservice »

Yes, that is the switch S2, which is located inside the housing. Pedal has enough gain at Lo position so
in my opinion it would be more useful if the switch was mounted out enclosure instead of switches for gain.
On my SMD PCB I predicted one switch in/out EQ mounted on the chassis and perhaps to add one more on/off switch to turn off gyrator for 276Hz.

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roberttomasz
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Post by roberttomasz »

...C19 100nF ,,,???.

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apollomusicservice
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Post by apollomusicservice »

roberttomasz wrote:...C19 100nF ,,,???.
Yes and it has function only in bypass mode.

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roberttomasz
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Post by roberttomasz »

B2-B3-C19(100nF)???? ...B2-C1-YES

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gefi
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Post by gefi »

Hello

L1 250 mH or 250uH?

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apollomusicservice
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Post by apollomusicservice »

gefi wrote:Hello

L1 250 mH or 250uH?
250 millihenries

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Bill_Mountain
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Post by Bill_Mountain »

I just sim'd the graphic EQ portion and unless I messed up it didn't equate to much more than a bass boost.

The mid control is nice though!

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Post by roberttomasz »

wah-wah ( Dunlop) L1= 500mH

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Post by Mrdorbe »

this is amazing, is it posible for you to upload a layout for a board with thru hole parts or a schematic file readable by a program?
i would really like to try building this one.
thanks :)

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apollomusicservice
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Post by apollomusicservice »

OK here is pcb done in through-hole technology, like original. There are two pcb's,
first with almost all components and second with jacks, pots and few components.
Pedal has very originally sounds and I change my prejudice about Mesa pedals. 8)
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Mesa Boogie Throttle Box first PCB.pdf
(73.29 KiB) Downloaded 1342 times
components.png

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Post by Mrdorbe »

Amazing man!! Thank you so much! I'll try to build it and update.

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Post by Mrdorbe »

Except the PDF has only one of the pcbs :cry:

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apollomusicservice
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Post by apollomusicservice »

...and second pcb with some minor changes in routing. 8)
Attachments
Mesa Boogie ThrottleBox second PCB.pdf
(31.78 KiB) Downloaded 1565 times

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