BAJA Sagittarian Charger (mini KLON)

bajaman · Post by **bajaman** » 22 Dec 2007, 23:07

Hi folks
I built this using a modified board layout provided in SHAKE'S blog page, after being alerted to it by soulsonic.
I had to trim the board a bit around the edges to get it to fit inside the Hammond 1590B bottom plate - I stuck some insulating mylar overhead projector film to the inside of the bottom plate first though to stop the circuit tracks shorting to ground

In the one of the pictures you will notice a small piece of mylar film bent at 90 degrees to stop the bypass buffer resistor from shorting against the inside edge of the bottom plate.
I changed a few of the components to standard values, used schottkey diodes in the charge coupler and 1N914 diodes for the dc input polarity protection. I also used 1N34 or 1N60 germanium diodes and OPA2134 high performance op amps in place of the 1N270 and TL072 types.
One radical change was to the 15k resistor following the input low pass filter - because of a sever lack of bass response I decreased this to 1k5 to get more bass boost though the following virtual earth mixing stage. i feel it definately improves the build.
I used a dual ganged 100k linear poti for the gain controll and 10k linear single potis for the treble and output controls.
You may notice a wiper on the back of the dual poti - this was used as a click stop in the centre of the potis rotation - all I had in a dual poti lying around - I removed the metal slotted circular cover piece because it was touching one of the 1uf electros when the bottom plate was attached

I will post any tweaks or improvements as they come to hand - in the meantime here is all the bits and pieces you need to build one.
Merry Xmas
bajaman

Version 1 build pictures:

ps: It is called a Sagittarian Charger because - surprise surprise

- I am A Sagitarrian

Cheers
bajaman

PCB and layout files revised:
check for version 2 here:
https://www.freestompboxes.org/viewtopic ... 554#p28554

Direct Links to Klon Centaur/Saggitarian Charger V2 PCB files[/b]

Wiring Diagram by Soulsonic (thanks!)

Klon Centaur/Saggitarian Charger V2 Parts List [/b](Compiled by 95strat - thanks!)

Resistors
R1 10k
R2 1M
R3 100k
R4 560R
R6 10k
R9 1k
R11 15k
R13 1k
R14 3.9k
R15 27k
R16 47k
R17 27k
R19 15k
R21 1.8k
R22 100k
R23 4.7k
R24 100k
R25 560 R
R26 68k
R27 68k
R28 100k
R29 27k
R30 27k
R5 4.99k ¼ watt Metal Film 1%
R7 1.5k ¼ watt Metal Film 1%
R8 1.5K ¼ watt Metal Film 1%
R10 2k ¼ watt Metal Film 1%
R12 422k ¼ watt Metal Film 1%
R18 12k ¼ watt Metal Film 1%
R20 392k ¼ watt Metal Film 1%

*All resistors are ¼ watt carbon film 5% except those italicized

Capacitors**:
C1 100n
C3 180n
C4 150n
C5 47n
C6 330n
C7 68n
C8 390p
C11 6.8n
C12 18n
C13 820p
C14 3.9n
C10 1µ (polarized)
C2 4.7µ (polarized)
C9 1µ (polarized)
C15 4.7µ (polarized)
C16 1µ Tantalum (polarized)
C17 47µ 16v Electrolytic (polarized)
C18 47µ 16v Electrolytic (polarized)
C19 4.7µ (polarized)
C20 1µ (polarized)
C21 1µ (polarized)
C22 1µ (polarized)

**All capacitors are Panasonic. Non-polarized Caps are ECQ series film type.
Polarized are M series. All Caps are 50v unless noted otherwise.

Footswitch: Carling 316P DPDT

Potentiometers: CTS 24mm Carbon type (450 series)
P1 100kB (gain) dual gang. Custom ordered on orginal
P2 10kB (treble)
P3 10kB (output)

Diodes:
D1 Red LED
D2 1N34A Germanium type
D3 1N34A Germanium type
D4 1N4742 9.1V 1W Zener
D5 1N4001
D6 1N4001

OpAmp:
U1 TL072CP
U2 TL072CP

Integrated Circuit:
U3 ICL7660SCPA[/quote]

soulsonic · Post by **soulsonic** » 23 Dec 2007, 01:37

VERY nice!!!
I love the E-H vibe with the graphics, and the compact build is great.

Greg · Post by **Greg** » 23 Dec 2007, 05:07

Nice work Bajaman.

madbean · Post by **madbean** » 23 Dec 2007, 06:37

Care to give us some sound samples??

bajaman · Post by **bajaman** » 23 Dec 2007, 07:17

Care to give us some sound samples??

Sorry - but you really don't want to hear my awful guitar playing

cheers
bajaman

Bernardduur · Post by **Bernardduur** » 23 Dec 2007, 12:39

Thanks man!

Need to build this soon!

frank.clarke · Post by **frank.clarke** » 23 Dec 2007, 17:22

Neat, sweet, petite!

guiltyspark · Post by **guiltyspark** » 23 Dec 2007, 17:32

Nice work!! Thanks for your contributions. How is the output on your builds, is it fairly loud?

Guiltyspark

bajaman · Post by **bajaman** » 23 Dec 2007, 22:05

How is the output on your builds, is it fairly loud?

yes - loud enough for a good clean boost - I would not call it atransparent boost though - has a strong enhanced midrange

bajaman

Post by **audioguy** » 11 Mar 2008, 13:56

Nice work, I plan to build one soon... quick question: With the part substitutions to more common components, how does it sound compared to an original? Would this be close enough to satisfy my curiosity, as I've got all of the parts on hand?

Thanks!

Audioguy

briggs · Post by **briggs** » 11 Mar 2008, 14:16

It was more than enough to satisfy my curiosity regarding the sound of the Klon. Nice for a tweak too

Post by **audioguy** » 11 Mar 2008, 19:30

briggs wrote:It was more than enough to satisfy my curiosity regarding the sound of the Klon.

That was exactly what I was after, thanks!

bajaman · Post by **bajaman** » 11 Mar 2008, 19:57

If you got a Fender Telecaster and a Twin Reverb amp with those big JBL or EV 12s in it , then this is the effect for you - anything else and it will honk like a goose. ( unless you perform major mods). This is not what I would call a "transparent boost circuit - and I am not the first to say this

bajaman

Post by **audioguy** » 11 Mar 2008, 20:02

Right, I've heard that the Centaur is not a transparent pedal. At this point I'm looking at building it just out of curiosity, but I dont want to hunt down some of those out-of-the-ordinary components.

bajaman · Post by **bajaman** » 27 Mar 2008, 07:26

UPDATE
I would advise against buiding this pedal at this point in time - I have since been made aware that it is nowhere near the KLON soundwise, however recent developments - which I am unable to disclose at present - are encouraging in regards to a much closer emulation.

Sorry about this secret squirrel stuff - please be patient, and all will be revealed in due course

cheers
bajaman

briggs · Post by **briggs** » 27 Mar 2008, 10:08

indeed it will!

Post by **audioguy** » 27 Mar 2008, 17:32

I can wait... thanks!

noelgrassy · Post by **noelgrassy** » 22 May 2008, 15:04

Hey gang! That was March when we resumed patiently waiting.
I'm really itchin' to see what's transpired in the interim.
All good things in all good time right?
Maybe a tiny hint wouldn't hurt the bit chompers?
I'm really hoping you guys have the holy-grail-inna-box as your reveal.

Greg · Post by **Greg** » 22 May 2008, 15:45

noelgrassy wrote:Hey gang! That was March when we resumed patiently waiting.
I'm really itchin' to see what's transpired in the interim.
All good things in all good time right?
Maybe a tiny hint wouldn't hurt the bit chompers?
I'm really hoping you guys have the holy-grail-inna-box as your reveal.

+1

Waiting with much anticipation...

bajaman · Post by **bajaman** » 22 May 2008, 20:52

Hi guys and gals
Thanks for your patience. The finishing touches are being put on the KLON reversed engineered schematic as we talk - it should be published soon.
In the meantime, i have applied some of this new component value knowledge to the Sagittarian Charger and have been most impressed with the results obtained by changing a few of the components to the correct Reversed engineered and verified KLON values. The Klon schematic that has been floating around elsewhere on this forum has a large number of inaccuracies regarding topology and component values - some of the capacitor values are well out of tolerance

I shall update this project this weekend - then you can build a true value component KLON replica with the Sagi Charger project

cheers
bajaman

BAJA Sagittarian Charger (mini KLON) [documentation]