A piggy back board for the TTSH project.
It does a sub regulation for the supply of the three VCOs (+ opt. the voltage processor).
This fixes the problem that the TTSH on board supply with the DC/DC converter is too weakly regulated for the extreme high demands of the VCOs, causing pitch variation with varying load currents, most obvious from the clock circuit ("clock bleed").
If you have fitted your TTSH with a linear regulated supply you might not run into this problem and you have no need for this add on.
Only the first run of the TTSH boards (sold December 2013 - delivered until May 2014) needs this
The second run of the TTSH already has a similar solution on board.
STATUS:
- Final boards are tested and OK.
- Boards of the first batch have been delivered and several have been build successful.
- Second batch of boards has been ordered, boards are available
BOM, schematics and build instructions can be found here:
viewtopic.php?p=1602145#1602145
VCO regulator board, mounted with 12mm length M3 spacer.
Price per board is 3 Euro, international shipping 4 Euro (registered letter, takes two to four weeks delivery time).
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LED resistor replacement boards:
qp is doing LED resistor replacement boards which are easy separable. See here
