AMZ FX ANALOG ALCHEMY GEOFX MEF ROG DIY WIKI

which diy bass preamp?..

Started by deadastronaut, March 16, 2013, 04:44:33 PM

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deadastronaut

#60
March 26, 2013, 06:33:22 PM
Quote from: JebemMajke on March 26, 2013, 06:22:08 PM

Yes, but not that big.


hmmmm i'll wait till you knock up yours and copy that then... :)
https://www.youtube.com/user/100roberthenry
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deadastronaut

#61
March 27, 2013, 10:31:41 AM
dooby dooby dooobyyyy ahhhh ahhhh ahhh ahhh ahh ahhhhhhhhhh... ;D

any news?
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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JebemMajke

#62
March 27, 2013, 10:44:04 AM
How about removing that 680k resistor after the vol pot, and using 1m pot for the volume. Because that's what you've changed from the original. Maybe that's your issue.

deadastronaut

#63
March 27, 2013, 10:45:56 AM
ahhh yes... :icon_idea:

i'll try that.
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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JebemMajke

#64
March 27, 2013, 11:41:20 AM
If it hits the top too soon, use log for volume. I mean in reality that's gain pot. You could add master vol at the end. And than place sym/asym sili/germ diodes on the first vol pot, thus making that gain pot. :)

deadastronaut

#65
March 28, 2013, 05:58:37 AM Last Edit: March 28, 2013, 06:52:17 AM by deadastronaut
going to try the other preamp today....see how that compares ;)


btw swapped that sw 100k for a 5k pot...gives a nice choice of range'.  8)


edit:
ok tried the other version, nice but i prefer the roundness of the bassman actually...both versions are @#$%ing loud...would these drive a speaker? just curious

i'll put the bassman back on breadboard... ;)
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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JebemMajke

#66
March 28, 2013, 10:18:50 AM
Not sure if they would drive a speaker. The "sunn" is great for that lower kind of bass sound.  I've played in Santana/Clapton tribute band with it and it was great. And bassman was used in metal/rock situations.

I'm building ggg TDA20x0 amp. With Tda2040 and 1x12 cabinet. And I'll use one of these two ( or both ) as preamp. Just need that 4.7r 1/2w resistor, and that's the reason why this project is on hold till Monday / Tuesday.
Nice mod, why only 5k?

deadastronaut

#67
March 28, 2013, 10:28:54 AM
5k seemed best i tried all from 1k to 100k...but i'll probably just keep it simple without the switch etc..

been trying to get a bit more mid control though....


https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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deadastronaut

#68
March 30, 2013, 09:56:30 AM Last Edit: March 30, 2013, 10:19:45 AM by deadastronaut
another nice mod is switching caps on the tonestack...

switching between 2.2n as normal, and a 1nf...the 1nf makes it great for soft rounded bass.  ;)...and the rest of the stack responds nicely too.

i think i'll go with this for a build...seems nice to me, and no jump in levels either.

i left the bat85's off as they didn't seem to bring anything to the party, put the 680k on out to 'tame' the overall level to be acceptable to me, but still have enough as a boost on the overall volume if needed.



https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

deadastronaut

#69
March 30, 2013, 01:09:37 PM Last Edit: March 30, 2013, 01:23:26 PM by deadastronaut
here's the layout and pcb files for anyone interested...checked over, all looks fine. 8)

https://dl.dropbox.com/u/7464107/bassmanlayout.pdf

https://dl.dropbox.com/u/7464107/bassman%20pcb.pdf

making a few pcb's today...

btw i put the pads in for the bat85's if you really want them in...(optional) ;)



https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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deadastronaut

#70
April 08, 2013, 06:19:30 PM
pcb populated, layout tested+verified.

should have made more room for the 1uf /470n caps..but i squeezed em in ok...

now to design my etch... ;)

sounds nice with that switching caps, warm to bright...suits my taste. :)...great preamp.

cheers guys!..  8)
https://www.youtube.com/user/100roberthenry
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J0K3RX

#71
April 08, 2013, 08:40:10 PM
Looks nice and clean and simple! I like it!!
Doesn't matter what you did to get it... If it sounds good, then it is good!

jpwilksch

#72
April 09, 2013, 09:29:30 AM
deadastronaut, i like how alive the bassman sounds in your clip - just what my bass has been missing too!

btw: do you have an active or passive bass?

deadastronaut

#73
April 09, 2013, 10:39:35 AM Last Edit: April 09, 2013, 10:46:16 AM by deadastronaut
hi jp,

i have a passive 5 string, sounds great now, when i listen to it without it , i understand why i never really played it much...massive difference. 8)

re: the layout:

i'm adjusting the layout to fit small trimmers and shifting a few caps to fit better, i'll post the layout/pcb up when done, soon  ok.

cheers rob.


just finished etching my box, waiting for paint to dry...building today.  ;)




https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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deadastronaut

#74
April 09, 2013, 11:18:51 AM
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

deadastronaut

#75
April 10, 2013, 12:30:15 PM
DONE!... 8)







https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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J0K3RX

#76
April 10, 2013, 12:44:08 PM
Once again you blow my mind with your design!
Doesn't matter what you did to get it... If it sounds good, then it is good!

deadastronaut

#77
April 10, 2013, 12:49:51 PM
cheers jim,  my missus actually chimed in on this design...as i kept ''fannying around'' too much in her opinion....  ;D

https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

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bluebunny

#78
April 10, 2013, 02:06:28 PM
That's gorgeous, Rob.  Much kudos to Mrs. Astronaut for the design.
  • SUPPORTER
Ohm's Law - much like Coles Law, but with less cabbage...

deadastronaut

#79
April 10, 2013, 02:32:27 PM
Quote from: bluebunny on April 10, 2013, 02:06:28 PM
That's gorgeous, Rob.  Much kudos to Mrs. Astronaut for the design.

Mrs astronaut said '' thankyou.......beep........................beep...........very much.......beep........................beep...................... ;D
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//
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