Datasheet

PedalSync™

Tru-Foot

LFO chip MV-55(B)

Datasheet - p.6

PedalSync_MV-55_MV-55B_Tru-Foot_LFO_Datasheet.doc DRAFT v9.1

Status LED

(pin 17)

The Status LED is normally on. When a program is written, the Status LED will blink.

Whenever the potentiometers are not stable (i.e. when they are moving or have recently

moved), the Status LED will turn off until they become stable again. Each pot will stabilize

after approximately three (3) seconds of no motion.

Tap button

(pin 11)

When in Pot/Tap Mode (Clock LED off), the tempo can be adjusted by tapping a momentary

switch two or more times. The timing between the last two taps will determine the tempo. The

tap button times out after approximately 2.5 seconds. If the Speed knob is moved after a

tempo is tapped in, the Speed knob will override the tapped tempo.

A single tap will reset the waveform to the beginning. This allows users sync up the waveform

with a single tap or when a CV clock starts transmitting. Again, this is only in Pot/Tap mode.

The chip syncs with incoming taps, and switches from Pot to Tap mode, at the moment of the

second tap.

The Speed pot and Tap button can change the Pot Mode output tempo while the chip is in

Clock Mode, however changes will not be apparent until the chip is switched to Pot Mode.

Tempo LED

(pin 10)

Tempo LED turns on at the beginning of the waveform (max. voltage) and off at the center of

the waveform. As such, the Tempo LED shows Offset and Duty Cycle adjustments.

To monitor the waveform on the output buffer rather than with the Tempo LED, use an op amp

buffer/follower circuit for the LED.

Clock or Pot/Tap mode switch

(pin 25)

The LFO timing source is selected with a switch:

[a] Clock, or

[b] Speed Pot and Tap Button

When the pin is grounded, Pot/Tap is selected

Disconnecting the pin places the chip into Clock mode.