The science of reverb springs and TB's VCA

[Tony Allgood]

......but you have to transmit
SOME energy or you aren't going to get anything out... i just figured it
should be mentioned in a thread with a title "The science of reverb
springs".. :]

Since we are nit picking here... the previous post is correct, we are
not transfering energy to the recovery circuit. We are monitoring the
emf produced across the coil. If no current is taken, ie infinite input
impedance, then no energy will be transferred. The energy is "produced"
by the preamp circuit's power supply. However, there is no such thing as
an infinite impedance so some current will indeed flow, but it will be
very small and there are many other factors to reduce the springs
energy. :-)

On other matters... the BA6110 OTA sounds just like a Roland BA662 to my
ears. However, it does feature linearising diodes, of sorts, like the
13700. Different pin-out as well, so don't go bunging 6110s in when you
should have a 662. The TB3030 SuperBassLine will be able to have either,
because there will be space for both. The pcb is now being laid out.
Tidy!

Regards,

Tony Allgood, Cumbria, UK

Rack mounted moog filter and the TB3030 SuperBassline projects:

http://aupe.phys.andrews.edu/diy_archive/schematics/oakley/