Tech21 - Sansamp Bass Driver  [schematic]

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Tech21 - Sansamp Bass Driver

Postby darmstat » 05 Sep 2011, 14:49

Does anyonr have a service manual for the Tech21 Sansamp bass driver di pedal?
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Re: Service manual for tech21 sansamp bass driver

Postby bajaman » 05 Sep 2011, 21:55

never seen any service documentation from Tech 21 :roll: :roll:
Behringer BDI21 is VERY similar circuit wise :wink: :wink:
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Re: Service manual for tech21 sansamp bass driver  [schematic]

Postby mozwell » 06 Sep 2011, 00:08

found this in my travels
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Re: Service manual for tech21 sansamp bass driver

Postby bajaman » 06 Sep 2011, 01:41

yep - that's the Behringer - just replace IC2 with a TLC2264 and you are 99% there :wink:
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Re: Service manual for tech21 sansamp bass driver

Postby darmstat » 06 Sep 2011, 04:03

Thanks alot gentlemen. :lol:
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Re: Service manual for tech21 sansamp bass driver

Postby skylark44 » 06 Jan 2012, 00:48

bajaman wrote:yep - that's the Behringer - just replace IC2 with a TLC2264 and you are 99% there :wink:

That's really helpfull...which one is "IC2", and where would I put clipping diodes, for mor distortion from the "drive" control? (sorry for the nOOb questions, I'm prety new to modding prdals :scratch: :| :oops: ) :mrgreen:
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Re: Service manual for tech21 sansamp bass driver

Postby mozwell » 11 Jan 2012, 06:24

IC2 is called U2 on the schematic.
You dont need clipping diodes, the sound of the TLC2264 is what you are after

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Re: Tech21 - Sansamp Bass Driver

Postby Leito79 » 22 Jan 2018, 19:30

First of all sorry about the necrothread... does anyone figured out how the Ground lift and line/inst switches work? I´ve built it and it works great, but i´ll like to have those 3 switches options. Had the chance to compare it to my bass player´s Original Tech 21 Bass Driver, going direct to a mixing console and using the XLR output (each pedal used a different desk channel, exact same settings, being switched with an A/B box to try to make the comparaison as neutral as possible), and with all pots at maximum, the original is way hissier/noisier than my build!!! I´ve used 1% MF resistors and Bipolar electrolytics for the 2.2uf coupling caps, maybe that´s the reason why is quieter. Also used plain vanilla TL072 & 74, they sound pretty close and with a less scooped feel, anyway I have sockets so I will try the TLCs. My build´s output level is definitely instrument level, compared to the original. I´ll like to add the switch to get LINE level, the volume difference is huge and very useful when going direct to a PA or mixing board, I believe the difference is 0dB vs -10dB, any thoughts on how to achieve this? Thanks!
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