http://midi-overdrive-switcher.becosfx.com
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Red LED's - clipping around 1.6V, for a wilder distortion in higher gain setting or an Almost Clean
boost in lower gain setting.
Note:
If you aim for the smoothest clipping, we recommend you try some 1N34 Germanium diodes
which nicely complement single coil pickups. However, they might sound "too compressed" with
humbucker pickups. A mix of Germanium and Silicon diodes yelds creamy distortion which sounds
really good, especially with crunchy amp channels.
Here are some hints on what effect semiconductors have on the clipping in overdrive circuits:
White or Blue LED's are good to obtain cleanest boost effect; or, remove LED's altogether;
Yellow and Green LED's start to break earlier than Blue but later than Red;
Red and Infra Red LED's are getting closer to Silicon diode clipping;
Use different Silicon or germanium diodes for classic tubescreamer sound & feel.
Change Indication LED's Color
If you want different colors for visible LED's used for MIDI activity, Bypass and external switching
relay's state indication, you can change them easily. We provided sockets, but you will have to take
the circuit board apart to swap the LED's. Please note that some LED's might be brighter or fainter
than other, and you may need to set the brightness to match them altoghether by adjusting the
corresponding current limiting resistors:
R210
for Relay 1 LED (default Red),
R211
for Relay 2 LED (default Red),
R212
for Effect/Bypass LED (default Green)
R213
for the Midi/Function LED (default Yellow).
Important!
When changing visual indication LED's,
do not
to exceed 16 mAh current consumption
for all LED's altogether. They draw current from a linear voltage regulator with limited amount of
current availability, which also powers everything else onboard. Check LED datasheets first and
adjust current for each LED to match light intensity
and
current consumption.
Troubleshooting
No LED lights at power up and no sound
- Change battery.
Not working when powered with a DC adapter
- Verify polarity (center minus). Verify voltage
(9V). If you powered pedal with reverse voltage, the protection diode might be blown and needs to be
replaced (this issue is not covered by warranty). If over voltage was used, the electronics inside could
be damaged (this issue is not covered by warranty).
Not switching amp channels
- Verify custom made switching cables and signal compatibility with
you amp. Review Table 1 in the manual for External Switching Relays pattern used.
