Change D-87 to D-87A (60V polarization voltage)

[joulupukki]

Hi all,

I've got a Dany Bouchard D-87 built into an Aurycle tapered body and I'm wondering if there'd be a way to convert it over to the circuit that's uses a higher polarization voltage? My hope would be to mod this so it has higher sensitivity and lower noise. It seems like I've seen a daughter board somewhere that'd allow doing something like this, but I've been searching the threads here and can't seem to find it.

Thanks!

 

[Khron]

I've got some thoughts that still need final testing, but in the meantime, you could breadboard @rogs ' version?

https://groupdiy.com/threads/dual-polarity-voltage-multiplier.86416/

 

[Khron]

... Although there's a bit more to it than just the voltage...

https://repforums.prosoundweb.com/index.php?topic=36194.msg531542#msg531542

 

[OneRoomStudio]

One big difference is in how the patterns are created. The U87i uses a capsule with isolated backplates, and as a result, introduces intra-backplate capacitance. The U87ai ties the backplates together, and generates patterns in a much 'simpler' way, which introduces less capacitance and pads the capsule less.