Manufacturer: acidlab 
Module Name: 3CO 
Module Type: VCO 
Production Status: In Production 
Module Width (hp):
Module Depth (mm): 28 
MSRP (USD): $115.00 
+12V Current (mA): 40 
-12V Current (mA): 20 
+5V Current (mA):
Information URL: http://www.acidlab.de/  Visit
Date Announced: N/A 
Date Introduced: N/A 
Date Discontinued: N/A 

About the 3CO by acidlab
(Manufacturer's description:)

The VCO of the TB-303 with its special square-wave. Same sound and behavior, as the original (shape and the pulswidth changes together with the pitch). The VCO circuit is the same that is used in the original. Improved stabilisation by the use of a temperature regulated antilog-circuit.