Xotic - RC Booster

madbean · Post by **madbean** » 06 Sep 2009, 03:58

My guess would be changes in the input cap and also in the Baxandall. Diodes could be anything. Germs might sound cool with bass.

Try increasing the input cap to either 100n or 220n. For the caps on the bass control, 68-100n, and the treble control, 10-15n. Maybe two 1n34a's in series on each side for the clipping diodes.

george giblet · Post by **george giblet** » 06 Sep 2009, 08:10

I was wondering what it really was

My guess for the treble cap is in the 10n region too. For the diodes I was thinking they are either removed or replaced by something along the lines of LEDs, MOSFETs, perhaps a combination with a silicon. Slightly harder clipping but more clean headroom.

The tone control bass frequencies are already fairly low. With the 10n cap the tone control isn't too far of the tech 21 stuff in normal use.

oneleg · Post by **oneleg** » 14 Sep 2009, 13:51

why not the gain is 250k A~~~

oneleg · Post by **oneleg** » 17 Sep 2009, 08:32

sinner · Post by **sinner** » 17 Sep 2009, 09:23

oneleg wrote:why?

Wrong tread, ask here https://www.freestompboxes.org/viewtopic.php?f=20&t=7347

plugzzzz · Post by **plugzzzz** » 29 Sep 2009, 06:57

madbean wrote:Not verified. Images are 600 DPI.

Code: Select all

Part	Value
C1	47n
C2	1uF
C3	150p
C4	33n
C5	33n
C6	4n7
C7	1uF
C8	4n7
C10	100n
C11	10uF
C12	10uF
C13	10uF
C14	2u2
	
R1	1M
R2	10k
R3	1M
R4	10k
R5	22k
R6	Jumper
R7	47k
R9	4k7
R10	33k
R11	4n7
R12	10k
R13	470k
R14	10k
R15	470R
R16	100k
R17	22k
R18	6k8
R19	15k
R20	33k
	
IC1	LF353N
Q1	2N5088
Q2	2N5088
D1-D6	1N4148
	
TREB	50kB
VOL	100kA
BASS	50kB
DRIVE	250kB

RC_PNP.png

RC_Layout.png

RC_Schematic.png

i tried this i burn the diodes what could be the problem??????>..... please help i really want to build an rc booster clone

Gonzo · Post by **Gonzo** » 02 Oct 2009, 14:32

Hi guys, I'm trying to fit the RC inside a preamp I'm building and i was wondering if i can take the baxandall and the output buffer out and get away with it. I would not miss the EQ and the output would go directly to the tube so...do you think is possible?

Gladson.Goes · Post by **Gladson.Goes** » 24 Oct 2009, 12:36

I finally got the figure of the PCB with the chip not shaved.

chicago_mike · Post by **chicago_mike** » 03 Nov 2009, 22:56

I could cut down from 6 to 4 diodes and make a real clean bass bost perhaps...

howareyou · Post by **howareyou** » 23 Dec 2009, 19:11

what is L+ L- Ls mean?

mikmix · Post by **mikmix** » 14 Jan 2010, 07:45

Can the Rc Booster work as a classic buffer if positioned at the start of the chain ?

Silent Fly · Post by **Silent Fly** » 14 Jan 2010, 08:50

mikmix wrote:Can the Rc Booster work as a classic buffer if positioned at the start of the chain ?

I can't see why not. If you just need a buffer something simpler might be more effective (and less noisy).

sevinisthenumber · Post by **sevinisthenumber** » 06 Feb 2010, 00:17

okay. please dont laugh....

i etched this attached layout and did it backwards. This means everything is in mirror image as the traces are actually on the wrong side of the PCB... hope that makes sense. what is the best way to build this board out so that I don't waste it? I have the op amp on the trace side of the board to make the pins hi the correct traces but its still not working?

filippor65 · Post by **filippor65** » 06 Feb 2010, 13:29

Silent Fly wrote:Enjoy

XoticRC components.jpg

XoticRC front.jpg

XoticRC back.jpg

XoticRC overlap.jpg

sevinisthenumber · Post by **sevinisthenumber** » 06 Feb 2010, 17:56

it works now. i just mounted the ic and transistors on the trace side....

fosnal1950 · Post by **fosnal1950** » 06 Feb 2010, 18:00

And how does it sound ? What amp are you using it on ?

I heard it being used on a De luxe rev and was impressed !

Spookymulder · Post by **Spookymulder** » 21 Feb 2010, 21:48

Hi Everyone,

I'm quite new to the opamp/TS-concept so maybe this might be a silly question: I recently finished my RC (on a breadboard, so its somewhat more prone to bugs) and it shows quite a lot of hum, which disappears when touching the strings or some other mass point. I'm just curious whether that is normal for the RC cause I've heard that it is especially silent!? Also, it doesn't really give me that much of a loudness boost, so for me it seems that there's something wrong.

IC is TL072, diodes 1N4148, transistors are BC549, mojo-resistor is metal though

, offboard-wiring is standard with 3pdt from tonepad. I checked the wiring more than twice, everything seems to be allright

Any ideas...?
Christian

Post by **The G** » 22 Feb 2010, 21:55

More likely, your guitar is not grounded properly. See if the guitar's bridge is electrically connected to the ground.

chicago_mike · Post by **chicago_mike** » 23 Mar 2010, 21:53

Has anyone built Madbeans RC Booster? I cant get mine to pass signal. Everything is wired / soldered up according to the pdf.

Post by **jstbrowsin** » 24 Mar 2010, 00:02

I can verify that MadBeans circuit works. I built one and it worked first time lucky me I guess. I'm sorry I can't help with the trouble-shooting process as I'm a paint by numbers sort of guy at the moment but the guys here are excellent with that sort of thing, so I'm sure you will be up and running in no time. What I can offer is "check, recheck and then check your recheck".

Good luck Mike

Xotic - RC Booster [traced]