Electric Druid FilterFX Project Руководство по строительству - Страница 4
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Electric Druid FilterFX Construction Guide
www.electricdruid.net
Cup of tea and soldering check
When you've finished doing the resistors, stop and have a cup of tea and spend a few minutes
looking over your solder joints and making sure everything's ok so far.
IC sockets
All three 8-pin DIP sockets are identical. The two for the op-amps are on the centre line of the
board with the notch pointed down, and the third one for the StompLFO is in the top-right corner
of the PCB with the notch pointing left. It helps to solder only a single pin or a couple of corner
pins first, and then give the socket a check. If it's sitting correctly and orientated the right way
around, you can solder the rest of the pins. If not, it's much easier to adjust it with only two pins
soldered. Removing IC sockets from plated-through-hole PCBs like this one is difficult and not
recommended.
Regulator
The 78L05 +5V regulator REG1 is in the top left of the centre of the board, just below the electric
druid logo. Be sure to line up the flat side and the curved side with the markings on the PCB.
Don't mix it up with the similar-looking transistors.
Transistors
There are two 2N3904 transistors, both along the top of the board. TR1 is to the right of the
right-most vactrol. TR2 is in the top-left in the Sync Input circuit. Both are marked with an
"n" (for "NPN"). Again, be sure to line up the flat side and the curved side with the markings on
the PCB.
Ceramic bypass capacitors
There are three 100n ceramic bypass capacitors, all at the top of the board. Two are beside the
STOMPLFO chip, and one more one is by the 5V regulator. These are not the fat 100n film cap
towards the bottom left. Don't mix them up! (although it'll still work if you do).
Film capacitors
There are four film caps in the FilterFX. You can use capacitors with either 0.2"/5mm or 0.3"/
7.5mm lead spacing. You can't use capacitors with 0.1"/2.5mm lead spacing - those two holes are
connected together!
• 10n (103, 0.01u) capacitor x 2 - centre left and centre right, either side of the TL072
• 100n (104, 0.1u) capacitor x 1 - bottom left
• 470n (474, 0.47u) capacitor x 1 - bottom right, by the smiley face :)
Electrolytic capacitors
There are only three of these, but you need to watch the polarity.
• 47u capacitor x 2 - these are next to the two vactrols.
• 100u capacitor - top left, just left of the electric druid logo
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