Page History

only for REV."2"  (v7.1 on pcb top right corner)

Mainboard BOM

http://thehumancomparator.net/wordpress/wp-content/uploads/2015/01/ttshv2BOM.pdf

250250

VCO Sub pcbs BOM

http://thehumancomparator.net/wordpress/wp-content/uploads/2015/01/4027v2BOM.pdf

please add: 6x 100nF SMT c0g caps in size 805
mouser part 100nF 77-VJ0805Y104JXXPBC
10nF works fine too (its only a decoupling cap)

3x Timing cap 680pF needs a polypropylenpolypropylene, polystyrene or silva mica cap(7.5mm footprint)
mouser: 80-PHE450HK3680JR05

you can try the usage instead of SMT inductors/chokes this:
http://www.reichelt.de/index.html?ACTION=3;ARTICLE=86466;SEARCH=L-HBCC %20100
(add enough soldercore to the pcb pads, bent the leads and solder this to the pads)


notice: the usage of 1k87 tempco 3300ppm instead of 3500ppm works fine too.

DIFF from Version 1to version2    (first TTSH from early2014 to second from early 2015)

http://thehumancomparator.net/wordpress/wp-content/uploads/2014/05/v1-v2-diffferences.pdf

Minor Bug/improvement: use a BC337-16 instead 2N5172 in the noise section more Details here (you don't need further mods)

works for most parts too..