RANDOM*SOURCE
RANDOMSOURCE.NET
8
J. HAIBLE Dual WASP Filter (Euro)
9.
Once everything is nicely in place, solder the pots, jacks und switch onto the component pcb
(while the front panel is attached).
10. Build the main board with all through-hole-parts required, beginning with the resistors, caps etc.
11. Connect a power cord sup12V, GND, GND, -12V to the power-header on the main board
and double check the direction of the power header before you turn power on. You should be
ready to go now :-)
Calibration
CV Rejection
: If you installed TRIM X and TRIM Y, simply feed a audio signal - ideally a pulse wave around
1kHz or so - into the CV Mode input, set the MODE knob to CCW (minimum) and turn the CV Mode knob all the
way up (make sure there is no other input anywhere). Listen to the MODE center output and adjust TRIM X, then
TRIM Y so that you get no (or hardly any) output - of course you can use a scope, too. (Don’t expect it to get
absolutely flat / quiet, especially with a pulse wave.)
BIAS
: If you’ve installed the two BIAS trimmers, you need no input at all. Use the scope to check the voltage
a the test pad marked TP next to TRIM X. Ideally it should be at 0 mV. Use BIAS X to set it accordingly. Then
repeat with test pad TP2 below the BIAS Y trimmer and you’re done.
