diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 9693e27..159a55e 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -31,7 +31,7 @@ use insert_coin::{CoreConfig, DacService, InsertCoin, LedService, SimplePwmCore}
 use ch32_hal as hal;
 use hal::bind_interrupts;
 use hal::delay::Delay;
-use hal::gpio::{AnyPin, Input, Level, Output, Pin, Pull};
+use hal::gpio::{AnyPin, Input, Level, Output, OutputOpenDrain, Pin, Pull};
 use hal::time::Hertz;
 use hal::timer::low_level::CountingMode;
 use hal::timer::simple_pwm::{PwmPin, SimplePwm};
@@ -64,11 +64,11 @@ impl Usb {
 }
 
 pub struct Amplifier {
-    amp_en: Output<'static>,
+    amp_en: OutputOpenDrain<'static>,
 }
 
 impl Amplifier {
-    pub fn new(amp_en: Output<'static>) -> Self {
+    pub fn new(amp_en: OutputOpenDrain<'static>) -> Self {
         let mut amp = Self { amp_en };
         amp.disable();
         amp
@@ -312,7 +312,7 @@ fn app_main(mut p: hal::Peripherals) -> ! {
     let extra_io_1 = p.PD0;
     let extra_io_2 = p.PD3;
 
-    let mut amp_en_output = Output::new(amp_en, Level::Low, Default::default());
+    let mut amp_en_output = OutputOpenDrain::new(amp_en, Level::Low, Default::default());
     let amp = Amplifier::new(amp_en_output);
 
     // set up interrupts