2-band bass guitar onboard preamp - Page 3 - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th March 2006, 02:24 AM   #21
Brion55 is offline Brion55  United States
diyAudio Member
 
Join Date: Apr 2005
Location: Kansas
Send a message via Yahoo to Brion55
No fun getting old, blind and... and... oh, forgetful!
Attached Images
File Type: gif guitar 3 eq.gif (10.0 KB, 1352 views)
__________________
How do I put the smoke back in this thing?
  Reply With Quote
Old 3rd April 2006, 04:00 PM   #22
DolbyR is offline DolbyR  Finland
diyAudio Member
 
Join Date: Oct 2005
ok, let me come to spam your thread
Haven't been at diy audio for quite a while but glad i found this. It looks perfect for my purposes, i'm planning Kreutzers preamp for quite long but never got to make it. I tried a regular baxandall integrated in the bass but it just lost too much from the signal.
So i guess i'll be building this one soon too probably with the 3-band EQ but it still depends whether i put the gain switch or something as i have only place for 4 knobs. I could use push-pull knobs though if the place gets too small.
One thing i was wondering, would a balance pot between my two P/U's make i good difference or do u guys think its unnecessary?
The bat holder is another subject i must think of also, maybe i could fit it inside the electronic 'cavity' but opening and closing could become a bummer...i could add a recharging circuit though, with the DC jack on the back of the bass i think my website is supposed to be on the sig so there's some pics of my cheapo bass and the baxandall (i think it was baxandall, cant really remember) anyway...it didn't work out well
  Reply With Quote
Old 4th April 2006, 11:46 PM   #23
Brion55 is offline Brion55  United States
diyAudio Member
 
Join Date: Apr 2005
Location: Kansas
Send a message via Yahoo to Brion55
They now make batt holders for guitars to allow easy access. It might be worth the effort.

I put my batt behind the pick guard along with the electronics. It's not very handy for changing, but I only have to do it every 10 - 12 months, even with a lot of use. I check the batt when changing strings.

A balance pot would be hard to do since you want both pickups at full volume with the pot in the mid position. Two volume pots or switches would be easier.
__________________
How do I put the smoke back in this thing?
  Reply With Quote
Old 5th April 2006, 05:44 AM   #24
DolbyR is offline DolbyR  Finland
diyAudio Member
 
Join Date: Oct 2005
Yes you're right on that, i currently have two volume pots, but i guess the circuit had to do somhow changed for that? Anywa, i lack of space for pots and i want the 3-band Eq so the only way would be to use p-p pots which are again larger. so i'll just forget this now, although i've wired the bass for 2 separate volumes, i'm actually only using them at the max anyway.
I guess i'll also forget the recharger circuit and if the battery really lasts that well, it won't be a problem as my electronics are on the back of the bass with a cover which opens with 2 screws. not like in strato's under the strings.
I guess i'll have some build pics after its finished, after few days, weeks, or months
  Reply With Quote
Old 15th April 2006, 02:27 PM   #25
DolbyR is offline DolbyR  Finland
diyAudio Member
 
Join Date: Oct 2005
Just one question..at first i thought its just a regular voltage divider in the circuit, by now that i start looking better at it, it doesnt exactly look like it...where does the the battery's [-] pole connect? just through a switching jack to ground?
  Reply With Quote
Old 15th April 2006, 02:58 PM   #26
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally posted by DolbyR
Just one question..at first i thought its just a regular voltage divider in the circuit, by now that i start looking better at it, it doesnt exactly look like it...where does the the battery's [-] pole connect? just through a switching jack to ground?
Yes, through the jack to ground, so it switches the power ON when you put a plug in, it's standard practice.

You are also correct in your thought that it uses a simple voltage divider to give a split supply, the two 4k7's.
__________________
Nigel Goodwin
  Reply With Quote
Old 15th April 2006, 06:17 PM   #27
DolbyR is offline DolbyR  Finland
diyAudio Member
 
Join Date: Oct 2005
thanks for the quick answer..
i'm still not advanced in reading schematics, but from what i understood, only half of each of the 4 opamps in the 3-band version is used...am i correct? a TL071 would work as good then too?
  Reply With Quote
Old 15th April 2006, 07:24 PM   #28
DolbyR is offline DolbyR  Finland
diyAudio Member
 
Join Date: Oct 2005
here's the layout i could manage..looks like ****...got to think what to do about it
Attached Images
File Type: gif preamp.gif (14.6 KB, 1035 views)
  Reply With Quote
Old 16th April 2006, 09:09 AM   #29
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally posted by DolbyR
thanks for the quick answer..
i'm still not advanced in reading schematics, but from what i understood, only half of each of the 4 opamps in the 3-band version is used...am i correct? a TL071 would work as good then too?
It would, but the original circuit only used TWO eight pin chips, each with two opamps in! - this is done to save space.
__________________
Nigel Goodwin
  Reply With Quote
Old 16th April 2006, 04:19 PM   #30
DolbyR is offline DolbyR  Finland
diyAudio Member
 
Join Date: Oct 2005
I'm getting a hard time in figuring how to use the opamps like they should would this look ok?
Attached Images
File Type: jpeg brion55_s_preamp.jpeg (25.6 KB, 1036 views)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Making and onboard bass guitar preamp Skywalker83 Parts 8 17th October 2012 04:28 AM
bass guitar preamp billr Tubes / Valves 19 26th May 2012 03:36 PM
Bass guitar preamp zafira1981 Tubes / Valves 33 26th January 2010 02:02 AM
Hybrid bass/guitar preamp Mikael Abdellah Solid State 10 16th February 2007 10:16 AM
onboard electric guitar/ bass preamp LJOE1969 Instruments and Amps 2 24th March 2005 05:33 PM


New To Site? Need Help?

All times are GMT. The time now is 01:44 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2