Bogner La Grange  [traced]

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

Lithium_Grim wrote:Then there is a high change you got a defective max1044. Try to replace it.
Starting to make sense...I was getting U1 and IC1 confused when looking at the diagram. U1 (LT1054CP) charge pump is overheating, so just ordered a couple from Mouser.

Am I correct that a LT1054CP can replace the MAX1044 in IC1 also?

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Lithium_Grim
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Post by Lithium_Grim »

No, an ICL7660S replaces a max1044, not a LT1054. Note that pin 1 and 8 are connected together in both 1044's. A 1054 can only replace it when you break the trace connecting pin 1 and 8!!!

The main difference between the 1054 and 7660S (note the s at the end!!!) is that the 1054 can deliver more current and is more pricy than the 7660S. But also the 7660S needs to have pin 1 and 8 connected together else it may tend to make your effect squeal like a pig. the 1054 must not have pin 1 and 8 connected. If a 1054/7660 heats up there can be more wrong! Check all caps surrounding the 1044s especially C6,C7,C10, C14,C15,C27 and check polarity. Note the @-9V the polarity of the caps are reversed! If you do not check this, you might replace a 1044 just to find out that you are blowing it up again.

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Post by jazztastic »

Lithium_Grim wrote:No, an ICL7660S replaces a max1044, not a LT1054. Note that pin 1 and 8 are connected together in both 1044's. A 1054 can only replace it when you break the trace connecting pin 1 and 8!!!

The main difference between the 1054 and 7660S (note the s at the end!!!) is that the 1054 can deliver more current and is more pricy than the 7660S. But also the 7660S needs to have pin 1 and 8 connected together else it may tend to make your effect squeal like a pig. the 1054 must not have pin 1 and 8 connected. If a 1054/7660 heats up there can be more wrong! Check all caps surrounding the 1044s especially C6,C7,C10, C14,C15,C27 and check polarity. Note the @-9V the polarity of the caps are reversed! If you do not check this, you might replace a 1044 just to find out that you are blowing it up again.
UPDATE: Small success...I replaced the U1 with the same chip the LT1054CP and at least the boost started working again. (Boost quit working after chip overheated) I ordered a couple ICL7660S to replace IC1.

QUESTION: My unit came with a MAX1044 in IC1 and a LT1054CP in U1 (as does the gut shot reflects in the beginning of this thread). It appears there is a trace connecting pins 1 to 8 on both U1 & IC1. Is this a mistake on the manufacturers part as far as substituting the wrong chips?

*EDIT#2: In other words, there should NOT have been a LT1054CP in U1 from the factory, if the circuit board trace is connecting pin 1 & 8...correct?

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Lithium_Grim
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Post by Lithium_Grim »

I did some research. Looks like my info is very outdated. There is no problem connecting pin 1 and 8 anymore with a LT1054. Source: https://www.diystompboxes.com/smfforum/ ... c=112200.0

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Post by jazztastic »

Lithium_Grim wrote:I did some research. Looks like my info is very outdated. There is no problem connecting pin 1 and 8 anymore with a LT1054. Source: https://www.diystompboxes.com/smfforum/ ... c=112200.0
Cool...good to know. I've read that a MAX1044 max voltage is 10v and that powering it with a single One-Spot supply producing 9.45v and 1700ma is asking for trouble...and that's exactly what the guy I sold it to was powering it with.

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Post by Lithium_Grim »

Yes, a 7660S is rated at max +13V and is a safer bet.

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Post by jazztastic »

Lithium_Grim wrote:Yes, a 7660S is rated at max +13V and is a safer bet.
Well...i'm in the home stretch. Replaced the MAX1044 in IC1 with an LT1054CP and I have signal passing thru now! Bad news is that there's the squeal that everyone refers to.

I have some 7660S coming in a few days, so will switch it out.

EDIT: Turned the gain down, plugged my guitar in and she is rockin' again! No squeal at reasonable gain settings.

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Post by Lithium_Grim »

Enjoy! PS. No need to replace the 1054 with 7660S.

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Post by jazztastic »

Pedal sounds great...however it has a crackle so there is probably a bad cap.

- While replacing IC1 7660S made the drive side work again, I still do NOT get a negative dc voltage off of pin 5. Decoupling cap connecting pins 2 & 4 bad maybe....?

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Post by nycLPplayer »

Used the board from Lithium_Grim

Image

Build report and demos coming soon....fits in nicely with the rest of the crew

Image

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Lithium_Grim
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Post by Lithium_Grim »

It is a beauty! But I am biased :D :applause:

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Post by A1full »

Lithium_Grim wrote:If (like me) you experience strange behavior when in boost only mode and turning the volume of your guitar down then consider putting a 10K between your guitar and the input of the Boost section. like this (Rx):
Bogner La Grange modified Boost.JPG
You could also consider to put Rx after C6 instead of before. Also you might consider a lower value then 10k (eg. 1k) if you think it is snooping off too much bass.

Personally I prefer this:
Bogner La Grange modified Boost pref.JPG
what does the zener diode do?

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Lithium_Grim
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Post by Lithium_Grim »

The Zener is there to protect the mosfet against possible static.

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Post by black03 »

Lithium_Grim wrote:The Zener is there to protect the mosfet against possible static.
thank you very much

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Post by FuzzMonkey »

nycLPplayer wrote:Used the board from Lithium_Grim

[ Image ]

Build report and demos coming soon....fits in nicely with the rest of the crew

[ Image ]
Love the mouse/rat trap enclosure.

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Post by blown_capacitor »

nycLPplayer wrote: 23 May 2018, 03:36 Used the board from Lithium_Grim

Image

Build report and demos coming soon....fits in nicely with the rest of the crew

Image
Looks beautiful!
Can you do me a favor and post a picture of the insides? I'm trying to fit the same PCB into an enclosure and can't quite figure out how to place things.

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Post by mr coffee »

Could someone repost Saruman's schematic?

Thanks!!

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The G
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Post by The G »

Look at the end of the first post. Somehow the schematic was attached as a link only.

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