diff --git a/firmware/auxout.cpp b/firmware/auxout.cpp
index 2e23203..b6e29d8 100644
--- a/firmware/auxout.cpp
+++ b/firmware/auxout.cpp
@@ -82,7 +82,6 @@ void SetAuxDac(int channel, float voltage)
 {
     voltage = voltage / AUXOUT_GAIN;
     auto duty = voltage / VCC_VOLTS;
-    duty = 1.0 - duty;
     duty = clampF(0, duty, 1);
 
     auxDac.SetDuty(auxOutPwmCh[channel], duty);
diff --git a/firmware/boards/f1_dual/io/io_pins.h b/firmware/boards/f1_dual/io/io_pins.h
index 8b1183e..24f4a23 100644
--- a/firmware/boards/f1_dual/io/io_pins.h
+++ b/firmware/boards/f1_dual/io/io_pins.h
@@ -55,7 +55,7 @@
 // PB15 - TIM1_CH3N
 #define AUXOUT_DAC_PWM_CHANNEL_1	2
 // CH2N and CH3N are complementary outputs
-#define AUXOUT_DAC_PWM_OUTPUT_MODE	PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
+#define AUXOUT_DAC_PWM_OUTPUT_MODE	PWM_COMPLEMENTARY_OUTPUT_ACTIVE_LOW
 
 #define ID_SEL1_PORT				GPIOC
 #define ID_SEL1_PIN					13
diff --git a/firmware/boards/f1_rev2/io/io_pins.h b/firmware/boards/f1_rev2/io/io_pins.h
index f3d2e85..aae02b0 100644
--- a/firmware/boards/f1_rev2/io/io_pins.h
+++ b/firmware/boards/f1_rev2/io/io_pins.h
@@ -47,7 +47,7 @@
 // PB15 - TIM1_CH3N
 #define AUXOUT_DAC_PWM_CHANNEL_1    2
 // CH2N and CH3N are complementary outputs
-#define AUXOUT_DAC_PWM_OUTPUT_MODE	PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
+#define AUXOUT_DAC_PWM_OUTPUT_MODE	PWM_COMPLEMENTARY_OUTPUT_ACTIVE_LOW
 
 #define ID_SEL1_PORT                GPIOC
 #define ID_SEL1_PIN                 13