Build thread on muffwiggler:

http://www.muffwiggler.com/forum/viewtopic.php?t=117137&highlight=living+vco

general lvco thread

http://www.muffwiggler.com/forum/viewtopic.php?t=93892&postdays=0&postorder=desc&start=130

http://www.baud-rate.com/blog/

known Issues:

R39 use socket and try 820K to 1M

cut the socket on left side for using the tempco

for c7/c8 are film caps fine or bipolar electrolyt caps

BOM Core PCB:

Living VCO Core BoM.pdf

BOM Driver PCB:

Living-VCO-Driver-BoM-v1.1.pdf

10K Poti for Frontpanel with vernier dials http://www.reichelt.de/534-10K/3/index.html?&ACTION=3&LA=446&ARTICLE=2543&artnr=534-10K&SEARCH=+53+4-10k

The calibration can be found here:
http://www.jhaible.com/living_vcos/jh_living_vcos.html

TRI to SIN converter:

source:https://www.muffwiggler.com/forum/viewtopic.php?t=93892&postdays=0&postorder=asc&start=50&sid=16eca0564da94b711592160be48cbf31

source: http://www.muffwiggler.com/forum/viewtopic.php?t=24267&start=0&sid=447cefb9a3fd208a3ab9f7c9245122b3

It is a precision rectifier and double-and-lift circuit to convert saw to triangle, followed by a standard differential pair sine shaper (from the Thomas Henry VCO-1, but optimized for Euro rails). Here's the parts list:
1 quad opamp (TL074)
2 NPN transistors (2N3904)
2 small signal diodes (1N914 or 1N4148)
3 22p ceramic caps
1 20k trimmer
1 50k trimmer
1 100k trimmer
and a small pile of 1/4W standard resistors:
1 390R
1 1k
2 2.2k
6 10k
2 13k
1 18k
2 20k
Notes:
1) the 5V source could be the 12V rail, with a 68k resistor in place of 20k . Alternatively, you could use a -5V source through a 10k resistor and a 20k trimmer into the negative input of the opamp.
2) the 100k trimmer could be replaced by a 43k resistor and a 20k trimmer (the ideal resistance there is about 53k for minimum sine THD). At the correct trimmer setting, the sine from this circuit can have THD as low as 0.42%.
3) the 50k trimmer could be replaced with two 24.9k 1% resistors, if the rest of the resistors around the transistor circuit are also 1% (or not).
4) If the saw is fed directly to the sine trimmer through the 100k trimmer (e.g., using an SPDT On-On selector switch) then this circuit also gives a "sigmoid" (S-shaped) wave, which is a nice alternative to saw.

Frontpanel:

JHLivingVCO1.fpd in MOTM

JHLivingVCO1_wo_red.fpd   in MOTM without red circle