Maestro - Brass Master : the corrections [schematic]
- chicago_mike
- Tube Twister
I have the r g keen layout and a gut shot of an origional.
But I would like a shot of the trace side, if anybody has one.
Thanks kindly.
But I would like a shot of the trace side, if anybody has one.
Thanks kindly.
Skyline FX 2013
- modman
- a d m i n
Information
- Posts: 4898
- Joined: 19 Jun 2007, 16:57
- Has thanked: 4411 times
- Been thanked: 2139 times
I found this:
- Attachments
-
- Maestro_BB-1_Bass_Brass_Master.PDF
- Maestro Bass Brass Master schematic
- (64.28 KiB) Downloaded 890 times
Please, support freestompboxes.org on Patreon for just 1 pcb per year! Or donate directly through PayPal
- analogguru
- Old Solderhand
Information
exactly that´s the reason why he needs the trackside.... because the schematic is wrong....modman wrote:I found this:
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- toneman
- Resistor Ronker
Information
- Posts: 343
- Joined: 17 Jul 2007, 13:05
- my favorite amplifier: anything that works
- Completed builds: meatolation, wobolation, ringolation clones, PAiA synths/modulars, dipthonizer clone, MOTM modules, pedal mods and repairs
- Location: sacatomatoes, Kali4neeaa
- Has thanked: 183 times
- Been thanked: 45 times
how can a factory schematic be wrong??
Tone-to-the-Bone
- chicago_mike
- Tube Twister
Factory schematics are wrong many many times. On purpose.
If anybody out there has a trace side of this thing. Unless one of us is good enough to take the component side and make a trace of that. I know Im not that good.
If anybody out there has a trace side of this thing. Unless one of us is good enough to take the component side and make a trace of that. I know Im not that good.
Skyline FX 2013
Not sure why the other topic is locked, but I thought I'd toss in that I have some new info on the Brassmaster, and the prospect of more yet.
The factory schemo is incorrect - in digging through it and simulating stages, it can't work the way it's shown. I've correct a couple of issues. There will be more on this as I dig it out.
The factory schemo is incorrect - in digging through it and simulating stages, it can't work the way it's shown. I've correct a couple of issues. There will be more on this as I dig it out.
- Bernardduur
- Transistor Tuner
Awesome!
Someone knows if the B:ASSMASTER by Malekko (I thought) is based upon this schematic? I still need to review some pedal for my job and that one is high on my list!
Someone knows if the B:ASSMASTER by Malekko (I thought) is based upon this schematic? I still need to review some pedal for my job and that one is high on my list!
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
- chicago_mike
- Tube Twister
Im not sure my thread got the locky-wocky, but im not going to fuzz about it.
But R.G., thanks for investigating this further.
But R.G., thanks for investigating this further.
Skyline FX 2013
Hi guys, first post here. I have completed a few projects from here and wanted to give back. Last year I took on the brassmaster project. I started with the schematic posted earlier in this thread and used RG's board layout. It never sounded that great, but I have played originals, so I knew what it was capable of. There are two resistors swapped on RG's layout. I need to check my notes as to which ones, but after changing these it did sound much better.
A very close friend of mine was then kind enough to lend me an original to reverse engineer. A week later another friend shows up at my place with 2 more. So now with three of these things I knew I would get to the bottom of it. I took the "incorrect" schematic and redrew it into Circuitmaker, I then took pictures of both sides of the pcb and did an exact pcb layout in Traxmaker. Using the check function I was able to verify that the schematic is in fact correct, and matches the pcb. The only inaccuracy is that the Q1 supply is not marked, but it should be fed from the 8 volt supply. I checked parts values and connections on the other two and they were all the same.
I'd like to offer the layout here, but I only have it in Traxmaker or Protel. If you give me till after the holidays I can probably post pdfs of the layout. I copied the original exactly, so in order to build one there are a lot of wires to connect. If someone can convert the files, just pm me and I'll email them to you to post for all.
The B:assmaster is also the same basic pcb. The actual pcb looks almost EXACTLY like RGs with a few changes. The main difference is entire circuit runs off of the 9v supply, and the 8v supply is missing. I also checked all the connections on this pcb and verified that it matches the original schematic.
All the units I have seen use 1N456 diodes. When I measured them with the diode check function of my meter, they all seemed matched. The diodes in the originals also read on the high side (.700). So I bought a bunch from Mouser, found some matching, high reading ones and viola. The matched diodes made the octave up much more pronounced.
I have more notes, but they need to be dug out.
Regards, John
A very close friend of mine was then kind enough to lend me an original to reverse engineer. A week later another friend shows up at my place with 2 more. So now with three of these things I knew I would get to the bottom of it. I took the "incorrect" schematic and redrew it into Circuitmaker, I then took pictures of both sides of the pcb and did an exact pcb layout in Traxmaker. Using the check function I was able to verify that the schematic is in fact correct, and matches the pcb. The only inaccuracy is that the Q1 supply is not marked, but it should be fed from the 8 volt supply. I checked parts values and connections on the other two and they were all the same.
I'd like to offer the layout here, but I only have it in Traxmaker or Protel. If you give me till after the holidays I can probably post pdfs of the layout. I copied the original exactly, so in order to build one there are a lot of wires to connect. If someone can convert the files, just pm me and I'll email them to you to post for all.
The B:assmaster is also the same basic pcb. The actual pcb looks almost EXACTLY like RGs with a few changes. The main difference is entire circuit runs off of the 9v supply, and the 8v supply is missing. I also checked all the connections on this pcb and verified that it matches the original schematic.
All the units I have seen use 1N456 diodes. When I measured them with the diode check function of my meter, they all seemed matched. The diodes in the originals also read on the high side (.700). So I bought a bunch from Mouser, found some matching, high reading ones and viola. The matched diodes made the octave up much more pronounced.
I have more notes, but they need to be dug out.
Regards, John
- unbeliever
- Breadboard Brother
Very cool. I have Protel also, and am more than happy to do the manipulation to get the info available to people here if you send me the file. I'll PM you.
- borislavgajic
- Opamp Operator
Information
- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
Dipthonizer,seekwah,Talkingpedal,morleywha
...soulpreacher,dynacomp,compulator
...buzzaround,fuzzfactory,screwdriver,sho,superdouper,St-9,RogerMayer octavia,Tychobrahe octavia,paralelluniverse,string damper,slowgear
...CE-2,ibanez fL301,EH theCloneTheory
EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser.... - Location: Sombor , Serbia
- Has thanked: 131 times
- Been thanked: 281 times
I can hardly wait to see!!!I can probably post pdfs of the layout. I copied the original exactly
You can use ...PDF Factory...free software,and then when you use PRINT function ( in protel or other software) instead of your printer you choose virtual print with pdfFactory......and there it is..............it is very easy and nice D.Hendrik pointed me to it
boris
- toneman
- Resistor Ronker
Information
- Posts: 343
- Joined: 17 Jul 2007, 13:05
- my favorite amplifier: anything that works
- Completed builds: meatolation, wobolation, ringolation clones, PAiA synths/modulars, dipthonizer clone, MOTM modules, pedal mods and repairs
- Location: sacatomatoes, Kali4neeaa
- Has thanked: 183 times
- Been thanked: 45 times
imo, all the schemos looked like they would function.
after all, RG's info has been up since 2002; and GGG is/has been selling pcbs with same schemo.
looking forward to the new pdfs!
especially a orig pcb bottom
was wondering,.................... do U have an o-scope?
i'd like to see a sine or triangle wave fed in, with probe points at:
collector of Q1 (is it clean or clipped?)
collector of Q2 (ditto; does the directly coupled base of Q3 affect the waveform? how?)
what does the output of C4 & C5 look like before the diode ring?
inquiring minds and all that.........
btw, the diode ring reminds me of the ringstinger
after all, RG's info has been up since 2002; and GGG is/has been selling pcbs with same schemo.
looking forward to the new pdfs!
especially a orig pcb bottom
was wondering,.................... do U have an o-scope?
i'd like to see a sine or triangle wave fed in, with probe points at:
collector of Q1 (is it clean or clipped?)
collector of Q2 (ditto; does the directly coupled base of Q3 affect the waveform? how?)
what does the output of C4 & C5 look like before the diode ring?
inquiring minds and all that.........
btw, the diode ring reminds me of the ringstinger
Tone-to-the-Bone
- unbeliever
- Breadboard Brother
Here are some pdfs produced from the file gtrgeek1 sent me. Do I need to do a PCB at the right size also? Let me know. And good work!
http://prophecysound.com/freestompbox/B ... verlay.pdf
http://prophecysound.com/freestompbox/B ... terPCB.pdf
http://prophecysound.com/freestompbox/B ... verlay.pdf
http://prophecysound.com/freestompbox/B ... terPCB.pdf
- chicago_mike
- Tube Twister
Awesome!!
Skyline FX 2013
- borislavgajic
- Opamp Operator
Information
- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
Dipthonizer,seekwah,Talkingpedal,morleywha
...soulpreacher,dynacomp,compulator
...buzzaround,fuzzfactory,screwdriver,sho,superdouper,St-9,RogerMayer octavia,Tychobrahe octavia,paralelluniverse,string damper,slowgear
...CE-2,ibanez fL301,EH theCloneTheory
EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser.... - Location: Sombor , Serbia
- Has thanked: 131 times
- Been thanked: 281 times
some guts please?
boris
boris
- bajaman
- Old Solderhand
Information
- Posts: 4549
- Joined: 26 Jun 2007, 21:18
- Location: New Brighton, Christchurch, NZ
- Has thanked: 596 times
- Been thanked: 2061 times
great work guys and thanks for sharing / co-operating
bajaman
bajaman
be kind to all animals - especially human beings
- analogguru
- Old Solderhand
Information
Do you still have this pictures ? for sharing ?gtrgeek1 wrote:I then took pictures of both sides of the pcb.....
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- chicago_mike
- Tube Twister
Hey Baja,
Now its time for you to make some "baja approved" improvemets to the circuit.
Now its time for you to make some "baja approved" improvemets to the circuit.
Skyline FX 2013
- borislavgajic
- Opamp Operator
Information
- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
Dipthonizer,seekwah,Talkingpedal,morleywha
...soulpreacher,dynacomp,compulator
...buzzaround,fuzzfactory,screwdriver,sho,superdouper,St-9,RogerMayer octavia,Tychobrahe octavia,paralelluniverse,string damper,slowgear
...CE-2,ibanez fL301,EH theCloneTheory
EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser.... - Location: Sombor , Serbia
- Has thanked: 131 times
- Been thanked: 281 times
yes/no?????analogguru wrote:Do you still have this pictures ? for sharing ?gtrgeek1 wrote:I then took pictures of both sides of the pcb.....
analogguru
please post pictures of original pcb
thanks
boris