Hello and thank you for building the Laka Sequential Voltage Pro Mixer. We hope you will find its
processing power most pleasing!
Assembly Instructions:
1. Install surface mount components on the rear of the PCB. We recommend using No-Clean liquid flux
on the board before applying quality solder paste such as Chip-Quik SMD291SNL, tweezing components
onto the board, and reflowing with a hot air station or oven.
-Take special care when placing and soldering IC’s U1-U9; the fine pitch of the legs on these
parts makes it likely that solder bridging will occur. In order to ensure there is no bridging, use
copper braid to “wick away” excess solder on the pins of these IC’s after initially flowing the
board. Using a multimeter to test for continuity after solder touch-up is also a good idea. (If
strange behavior occurs upon power-up, it is very likely that a solder bridge on a TSSOP package
is the culprit.)
2. Solder rear through-hole parts: 10-pin Eurorack power header, 2x 6-pin “expander” headers, ten
Multiturn trimmers, and 2 TO-92 TL431 regulators (U10 and U11)
if, and only if, you did not use
SOT-23-3 TL431 regulators in footprints U10B and U11B.
