diff --git a/timer.h b/timer.h
index 204a1d5..32eed90 100755
--- a/timer.h
+++ b/timer.h
@@ -195,6 +195,10 @@ struct PwmChannel {
   static inline void set_frequency(uint16_t f) {
     OCR1A = f;
   }
+  static inline void set_frequency_pulse(uint16_t f) {
+    OCR1A = f;
+    OCR1B = f - (f >> 2);
+  }
 };
 
 struct NoPwmChannel {