http://www.uoguelph.ca/~antoon/circ/ps3010/ps3010d.html
power black light or any other small fluorescent tube from 6V battery
http://www.aaroncake.net/circuits/blklite.htm
http://www.uuhome.de/william.darden/
suitable for powering opamp circuits
http://www.psyber.com/~dibsed/CIRCATS/opamp-ps.pdf
easy to build and adjustable from 0-15 volts
http://www.aaroncake.net/circuits/supply3.htm
Dual Tracking Power Supply provides 0 to 15V and 0 to negative 15V.
http://members.tripod.com/michaelgellis/power3.html
Here is the schematic, PC board layout, and parts placement. Always breadboard first!
http://www.musicfromouterspace.com/analogsynth/vca.html
The function of this dual VCA is very similar to the other one. It uses one less chip but one more transistor. It uses the built in LM13700 buffers instead of OP-AMPs.
http://www.musicfromouterspace.com/analogsynth/newdualvca.html
with Modulator
http://www.paia.com/9730sch.gif
with Modulator
http://www.paia.com/9720.htm