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4
J. HAIBLE Dual WASP Filter (Euro)
•
There are 2 pairs of (optional) trimmers to optimize the MODE performance:
“
TRIM X
” and “
TRIM Y
” control CV Rejection. These can be calibrated by ear (or scope). See details
below.
“
BIAS
” trimmers can be used to eliminate output offset, for this you need a good scope (a good DMM
might work, too). This is really for the perfectionists - see calibration info below -, so if you don’t have a
scope, it’s probably best not to bother: install RGX, RGY and a link from pin 1 to 2 (center) or 3.
•
Be careful: 2 of the op-amps (left and right) are SINGLE! The ones in the center row are DUAL.
Do not confuse SINGLE and DUAL op-amps up or they will burn
!
•
There’s a dual op-amp (in SMT) on the panel pcb: without this, turning the CV attenuator (without CV
going in) will affect the Cutoff frequency. Install the op-amp to avoid this (but omit the resistors marked
RLX!)
•
Recommenden: use OPA2134 (instead of TL072) for all dual op-amps and
OPA134 for the single ones.
•
The Dual WASP has to be powered by a
+/-12V stabilized PSU
only.
•
Random*Source has aquired all rights to Jürgen Haible’s electronic heritage and is the only legitimate
source for Jürgen Haible’s designs.
