$25        YuSynth CV Standards PCB
 
$95       Component Kit (many trimmers, .1% resistors)
 
$50        Hardware Kit (6 rotaries, 12 jacks)
 
Control and tune multiple VCOs with absolute precision!
Designed by Yves Usson.
See the project page here.
R1 and R2 are replaced with ferrite beads.