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Messages - blues dog

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Schematics and Layouts / Re: LR Baggs Piezo-Pickup preamp
« on: November 02, 2011, 09:30:44 PM »
Agree with JM. Q4 used to maintain some freq for the piezo.
I guess this make the preamp character for the piezo sounds smooth in treble area.

BTW I succesfully made the circuit for the owner of this preamp.
So now he has 2 guitars with similar preamps:
- Godin (I forget the model) with this original LR Bags preamp
- budget Greg Bennet Les Paul with the "replica preamp"

Both of us love the tone. Even the customer feel sooo satisfied with the project   :)

Schematics and Layouts / LR Baggs Piezo-Pickup preamp
« on: September 21, 2011, 11:43:28 AM »
My effort of tracing the LR Baggs Piezo-Pickup preamp from a Godin guitar (the guitars belongs to my customer). I triple check the trace.. Hope don't miss something there..  :D

The Newcomer's Forum / Re: Orange Crush 15R
« on: August 11, 2011, 09:28:36 PM »
Just after got the schematic, get into the board, around 90minutes, all is done..  8)

I've complain about some "fuzz leak" ini my own built clean channel. And no reverb at all.

My biggest interest is in reverb. So I check the reverb section. Getting frustrated, I cut the dry signal. I want to check how the reverb signal work. Then I found out: no signal. Only a tiny fuzzy tone goes out there. But shaking the reverb tank will gives a big rumbling reveb sound.

Looking at the schematic I found out that one single IC work as the driver and receiver of the reverb. I'm curios: is it posible that the first opamp is broken while the second one is not? I just replace the IC (TL072 in schematic, but TL082 onboard) with a new TL072. Done!!! There's an obvious reverb now!

Then I put back the dry signal. Just as I expected. The tiny fuzzy tone is also gone! Now I have a pure clean british channel.

Then I goes to the drive section. The original signal path of Crush 15 (drive channel). The reverb is also there.

The signal path goes like this:
- channel A: Big Butt (GAIN, VOL, PRESENCE = TONE)
- channel B: Crush 15 drive channel (GAIN, VOL)
back to Crush 15 board: EQ section
SEND jack = End of EQ section
RETURN jack = back to MASTER VOLUME*
to REVERB driver & receiver
- channel A REVERB pots
- channel B REVERB pots
back to mixing section
goes to power AMP**

*I bypass this pots, since each channel already has one
** In Crush 15 board, the signal path ended going in TDA2030, the TDA 2030 is already cut out when the unit came. But not wired properly. So now, I wired this point to the power amp board.

That's it. I might want to make a video about it.. Still not decide yet..  :)

Tks guys.. Tks JMF. You're the best!  ;)

The Newcomer's Forum / Re: Orange Crush 15R
« on: August 07, 2011, 06:52:03 AM »
speechless.. but really thinking hard..

thank you sooo much..
What you've said really really open a new perspective to me.

I'll sent the progress here.

The Newcomer's Forum / Re: Orange Crush 15R
« on: August 07, 2011, 01:53:49 AM »
My main problem is that my customer insisted on Low Budget cost...  :'(
And it's kinda frustrating me..

If it's my Amp, I will do exactly what you said.
It will be muuuuch more easier to build an all new preamp section.

But the owner also have problem. He already spend a lot of money for the head cabinet amp until he found that the tone and the feature is awfull. When first came, the amp goes like this:
* the Vol of channel A and Ch B interact each other
* the Gain of Ch A and Ch B interact each other
* the REVERB of Ch A and Ch B interact each other
* The connection of the "LineOut", "SEND" & "RETURN" jack is not proper.

So what I do is try to minimize the bad things.

About the PCB tracing & channel wiring; I spend 2 nights doing that..  ;D

About the chasis & the cabinet, they're all made here in Indonesia.
I might find some details about the manufacturer & will email you later.

The Newcomer's Forum / Re: Orange Crush 15R
« on: August 06, 2011, 06:07:03 AM »
Here's some pic of the progress...

The "raw circuit traced" I've done

The grand design:

The chasis

Top view:

My "Big Butt" along with his new friend the "Crush 15"  :D

Channel switching:

The Newcomer's Forum / Re: Orange Crush 15R
« on: August 06, 2011, 06:00:23 AM »
Hai there.

My name is Dogie, from Indonesia.

I have a customer asking for me to mod his Orange Crush-15R
The clean channel is removed with my "bluesbreaker pedal" clone
And the power amp section is removed and replaced with all new 100w power.

So it goes on like this:
Ch A: Big Butt ( )
Ch B: Orange Crush 15R (lead channel)

it goes to EQ of Orange Crush 15R
reverb -> split REVERB controlls for each channel
-> MASTER volume (the MASTER pots is bypassed) ->

The layout (and the knobs feature) will be similar to JCM900 style.
The circuit is already moved to the larger chasis.

Somehow, it works, but not properly..
In the bluesbreaker channel I still got the leakage from the "original OD" channel.

The Reverb also won't come out properly.
If I shake the tank, I can hear the shaking sound. But not In the tone when I played with.

I really got lost..  :'( I traced the PCB in desperation...
A schematic will help a lot.

So maybe you can sent me the schematic.

Awaiting for your reply.

best regards

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