RANDOM*SOURCE
RANDOMSOURCE.NET
3
J. HAIBLE Dual WASP Filter (Euro)
The R*S kit consists of a main pcb and a matching panel pcb which serves as an interface to the front panel.
Bot pcbs version 1.00 are through-hole (TH) with only very few optional SMT parts (BCM857 on the main pcb
and dual op-amp on the panel pcb):
Please note:
•
You have to decide for each filter if the distortion should be before the filter (PRE) or after (POST) by
setting
3 jumpers
for each side on the main pcb: all three in the UP position = PRE, all three DOWN =
POST:
(Do not try anything in between!)
•
If you don’t use a BCM857, pay attention to the direction of the transistors Q1 and Q2
(emitters are marked “E” on the pcb) - incorrect orientation can damage the bottom LM13700 (IC5,
close to the power connector). If you accidentally used an incorrect trasistor (pair), you probably have
to replace the LM13700 for the middle section to work after you fixed the transistors.
