Mesa Boogie - Throttle Box  [schematic]

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Re: Mesa Boogie Throttle Box schematics

Postby Nikifena » 06 Nov 2013, 23:35

There is something strange (or not complete) in the schematics around C19

First leaving one of the C19 pins unconnected this will makes some pops, so a high value resistor to ground must be added.
Second Mesa adds SW1B switch there to decrease the the gain (drive) from stage around IC1A. With this trick they makes the drive quiet in bypass. Connecting C19 to ground will increase the gain in the low frequencies and this is not the original mesa idea. I'm sure. And yes, the effect will works with this schematics, but there is some schematics mistake.

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Re: Mesa Boogie Throttle Box schematics

Postby 56335130 » 04 May 2014, 13:02

Image

one yats plus one 5band eq and boom you got your self a mesa,fuzz ish ,mark 1 and 2 kind of sound :horsey:
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Re: Mesa Boogie Throttle Box schematics

Postby 56335130 » 04 May 2014, 13:11

56335130 wrote:[ Image ]

one yats plus one 5band eq and boom you got your self a mesa,fuzz ish ,mark 1 and 2 kind of sound :horsey:


oops image too large.it was a 78' ic huge muff pie
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Re: Mesa Boogie Throttle Box schematics

Postby kaya112 » 02 Oct 2014, 16:19

R19 =0 ? :scratch:
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Re: Mesa Boogie Throttle Box schematics

Postby tasteless » 02 Oct 2014, 19:17

Zero Ohm resistor - Yes , There is such a thing ! - Just don't ask Me why.
It looks like a resistor with a single black band.
I think they are sometimes used for test points - Where it's easier to quickly see a blank resistor than a wire link.

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Re: Mesa Boogie Throttle Box schematics

Postby Nocentelli » 02 Oct 2014, 20:04

Also, for automated board-stuffing - The same machine can place resistors or zero ohm resistors in place of a jumper.
Plus, they look cool.
mmolteratx wrote:absolutely zero commercial use allowed. If I find anyone selling these, I'll fly to your house and kick you in the nads. And you may or may not find yourself in trouble.
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Re: Mesa Boogie Throttle Box schematics

Postby kaya112 » 03 Oct 2014, 01:23

There is something strange (or not complete) in the schematics around C19
Black lines and red line ?
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Re: Mesa Boogie Throttle Box schematics

Postby kaya112 » 10 Oct 2014, 02:15

C10=0u22 220nF ? :scratch:
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Re: Mesa Boogie Throttle Box schematics

Postby apollomusicservice » 10 Oct 2014, 10:46

kaya112 wrote:C10=0u22 220nF ? :scratch:

yes
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Re: Mesa Boogie Throttle Box schematics

Postby kaya112 » 10 Oct 2014, 15:24

thank apollomusicservice :D
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Re: Mesa Boogie Throttle Box schematics

Postby kaya112 » 10 Oct 2014, 15:33

Image new pcb :D
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Re: Mesa Boogie Throttle Box schematics

Postby kaya112 » 10 Oct 2014, 15:36

kaya112 wrote:[ Image ] new pcb :D
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Re: Mesa Boogie Throttle Box schematics

Postby kaya112 » 10 Oct 2014, 15:37

Image :D
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Re: Mesa Boogie Throttle Box schematics

Postby Lord Metal » 30 Oct 2014, 08:21

apollomusicservice wrote: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)



What are SV1 and SV2?
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Re: Mesa Boogie Throttle Box schematics

Postby apollomusicservice » 30 Oct 2014, 09:12

Throttle Box has two Pcb's, SV1, SV2, SV3 and SV4 are connectors for
flat cables that connects these boards. SV1 with SV3 and SV2 with SV4.
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Re: Mesa Boogie Throttle Box schematics

Postby andregarcia57 » 18 Nov 2014, 04:19

kaya112 wrote:
kaya112 wrote:[ Image ] new pcb :D

?
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Re: Mesa Boogie - Throttle Box

Postby gregilmejo » 30 Nov 2014, 16:51

Hello guys.
Firts of all, what a wonderful work!
I am building this mesa boogie throttle box and i wish the sound will be as same as possible as the MB.
Second, if anyone has a audio test, please post it.(Obviously of the mesa boogie throttle DIY)
So, i have a little question, it's : how many switch has this pedal? I can't understand what are the switches. Please give me help..
And, what op-amp can replace jrc4558? And Tl?
Thanks!!
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Re: Mesa Boogie - Throttle Box

Postby giacu92 » 14 Jan 2015, 18:42

gregilmejo wrote:So, i have a little question, it's : how many switch has this pedal? I can't understand what are the switches. Please give me help..
And, what op-amp can replace jrc4558? And Tl?
Thanks!!


Hello!
To reply your answer.. The pedal has two switches. One is the outer "LO/HI" DPDT, the other is internal and provides signal equalization through the three active filter made on IC3 (the second TL074).

The JCR4558 can be replaced by any double opamp such as TL072, TL082, NE5532, OPA2604 etc..

I'm upping this thread because i made a panelized version of the pcbs that can be ordered on pcbs maker sites such as "Oshpark" or "itead studio".

If anybody want to share pcbs realization with me, i can order them on dirtypcbs.com and then re-ship. A batch of 10 for the price of 25$, shipping included. It makes the "pcb kit" for the project costs 2.5$ each, plus shipping.

This is the oshpark render, just as idea:
Image

I have to adjust silkscreen graphics. This is just a render..
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Re: Mesa Boogie - Throttle Box

Postby AAntonio » 18 Apr 2015, 12:34

giacu92 wrote:
gregilmejo wrote:So, i have a little question, it's : how many switch has this pedal? I can't understand what are the switches. Please give me help..
And, what op-amp can replace jrc4558? And Tl?
Thanks!!


Hello!
To reply your answer.. The pedal has two switches. One is the outer "LO/HI" DPDT, the other is internal and provides signal equalization through the three active filter made on IC3 (the second TL074).

The JCR4558 can be replaced by any double opamp such as TL072, TL082, NE5532, OPA2604 etc..

I'm upping this thread because i made a panelized version of the pcbs that can be ordered on pcbs maker sites such as "Oshpark" or "itead studio".

If anybody want to share pcbs realization with me, i can order them on dirtypcbs.com and then re-ship. A batch of 10 for the price of 25$, shipping included. It makes the "pcb kit" for the project costs 2.5$ each, plus shipping.

This is the oshpark render, just as idea:
[ Image ]

I have to adjust silkscreen graphics. This is just a render..




i'm interested

could you give me the file eagle?
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Re: Mesa Boogie - Throttle Box

Postby wkhoury » 19 Apr 2015, 00:54

Hello everyone,
Was anyone successful in building this from the original posted schematic? It's not the easiest pedal to build so it'd be nice to know if it's been verified to work before I get started on it :)
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