Bogner - La Grange  [traced]

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

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Intripped
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Post by Intripped »

wow, you've done a great work here! thanks!
how did you managed to remove that goop?

I see from the schem a lot of similarities with the zwex pedals (SHO, Box Of Rock, ...can you identify the transistors' numbers? bs170?), but there's also an opamp stage and hard clipping with different diodes options, which i don't recognize as a known circuit, in this moment.

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Saruman
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Post by Saruman »

how did you managed to remove that goop?
Im Degoop Doctor :?

opamp (OPA132) K=1,5. Its boffer.

bs170 as in exampes:
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Saruman
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Post by Saruman »

La Grange is modified Zvex Box Of Rock.

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Post by fuzzbunny »

:applause: Bravo!

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Post by bajaman »

:D
What is that pic chip for ?
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Intripped
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Post by Intripped »

this La Grange looks like a combination of different pedals; from what i can see there is:

- a switchable BOOST section (SHO) in front

- an op-amp gain stage (if i'm not wrong the gain is 2.5, being R37(rf)=15K and R31(r2)=10K, in a non-inverting configuration)

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- a modified COT50, ala Briggs, with different clipping options, "nature"="blend" and "structure"=fixed value

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- a Box Of Rock with some tweaks and options

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Chugs
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Post by Chugs »

Nice work. Is there parts values for the schematic?

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Post by bajaman »

That op amp buffer / gain stage looks a bit weird - if it is powered by+9 and -9 volt supplies why is there an additional +9v bias rail ?
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Saruman
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Post by Saruman »

Is there parts values for the schematic?

Only after crack Red Ecstasy Pedal. Waiting for 3 years on this forum, but why owners Red Pedl are very lazy :cry:
I buy La Grage and after 5 days I havу it scematic.

That op amp buffer gain stage looks a bit weird - if it is powered by+9 and -9 volt supplies why is there an additional +9v bias rail ?

bias rail is + 0.7V gives maximum undistorted signal on opamp

Intripped, you are absolutely right! :applause: 15k,10k

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Post by rcustoms »

awesome work dude,values please to draw the pcb
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Post by Intripped »

Saruman wrote:Intripped, you are absolutely right! :applause: 15k,10k
i'm Resistor Ronker :?

...bytheway: what does ronker mean?

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Saruman
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Post by Saruman »

I do not know, I'm not an еnglish speaker!

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FuzzMonkey
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Post by FuzzMonkey »

Intripped wrote:
Saruman wrote:Intripped, you are absolutely right! :applause: 15k,10k
i'm Resistor Ronker :?

...bytheway: what does ronker mean?
Try Urban Dictionary maybe???

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Post by J0K3RX »

FuzzMonkey wrote:
Intripped wrote:
Saruman wrote:Intripped, you are absolutely right! :applause: 15k,10k
i'm Resistor Ronker :?

...bytheway: what does ronker mean?
Try Urban Dictionary maybe???

I think it's pretty much the British equivalent of what Americans refer to as, trailer trash, white trash, wal-mart people etc.. Definitely not a compliment.. :lol:

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Post by orcl2 »

Hi guys, nice work by the way, did you have the schem fot this?

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Saruman
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Post by Saruman »

to be continued.....

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Post by FuzzMonkey »

Saruman wrote:to be continued.....
I look forward to it. Can I ask if the pedal still works after de-gooping it? I know they're not exactly cheap.

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Saruman
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Post by Saruman »

Рedal work after de-gooping. No problem.

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Post by Saruman »

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