EPK Harmonic Energizer User manual

Harmonic Energizer Kit
Building Manual

Effect Pedal Kits:
Harmonic Energizer
The Harmonic Energizer Kit lets you build your own Systech Harmonic
Energizer ™ replica. The Harmonic Energizer is a wide range notch
filter: this pedal lets you dial ultra-narrow and resonant filtering, way
beyond the range of most wahs. With extreme settings, the Harmonic
Energizer even produces some overtones in weird ways well worth
experimenting with. Another use of this versatile envelope filter is the
“stuck wah“, useful if you want to boost some frequency of your
instrument into high resonance. You can hear some examples of the
sounds that can be achieved with the Harmonic Energizer in Frank
Zappa ‘s “Shut Up and Play yer Guitar”.
Besides of the three knobs present in the original Harmonic Energizer,
we’ve added an external Volume knob to easily set the output, as with
different filter options the output volume can change slightly. The
Bandwidth knob changes the sharpness of the frequency notch filter.
Wide settings will deliver a more classic sound, while a narrower filter
will produce a more aggressive tone. With Frequency and Gain you can
set the gain and frequency to boost. If you want an incredibly fun to
play effect pedal, we highly recommend you the Harmonic Energizer
Kit!

BOM (1/2)
Resistors (18) Capacitors (14)
4 R1, R7, R8, R16 1k 1 C1 2.2n
1 R2 4.7M 2 C2, C6 1u (electrolytic)
4 R3, R9, R14, R15 10k 2 C3, C7 47n
2 R4, R17 22k 6 C4, C5, C8, C9, C12, C13 10u (electrolytic)
1 R5 27k 1 C10 100u (electrolytic)
1 R6 5.1k 1 C11 100n
1 R10 20k 1 C14 10n
1 R11 2.2k
1 R12 560
1 R13 100k
1 R18 240k

BOM (2/2)
Diodes, Transistors and ICs Generic Parts and Potentiometers
1 U1 TL074 1 Battery clip
1 Q1 J113 1 DC Jack
1 Q2 2N5088 1 RLED 1k LED resistor
1 D1 1N914 1 LED Bezel
1 3PDT
2 IN, OUT 6.35mm Jacks
1 5k Linear (B) Potentiometer Band
2 50k Logarithmic (A) Potentiometer Freq, Gain
1 100k Logarithmic (A) Potentiometer Vol

Component Placement

Board Layouts
3PDT PCB
Effect PCB

Building Tips
1- Pay attention to the orientation of the 3PDT! In the following picture
you can see how the 3PDT pins should be positioned (inserting the pins
in the holes can be a bit tight to avoid movement while soldering):
2- For a proper soldering you just have to apply the right amount of solder
wire. A right solder joint should have a concave shape around the joint
and look like this:
3- Don’t apply too much heat! When soldering, the time you hold the
solder iron against the joint should be as short as posible to avoid
damaging any part (a few seconds should be enough). If you can’t get a
solder joint right, let it cool a bit before trying again.
4- If having troubles with the building, checking the schematic in the last
page will help you find where the audio signal stops. When you find the
spot, check out that everything around that joint is ok (components
placed at their right place, solder joints…).

Building Tips
5- Pay attention to the parts that have a polarity and make sure they are
connected as in the component placement picture:
- ICs (they have a small dot or indication that must fit the indication in
the board
- Electrolytic capacitors (longer pin is connected to the “+” hole):
- Diodes (check for the mark and make it fit with the one in the PCB):
- Leds (longer pin is connected to the “+” hole)
- Transistors (inserted to fit the drawing in the PCB)
To avoid any issue, check the latest building manual. Use the pictures only as
a reference! Colors/shapes can change slightly, always check the part polarity,
resistor values, potentiometer placement… before soldering.

Schematic