Reutilization of Christmas Light with broken controller

int phase1 = 3; //control the left bjts 
int phase2 = 5; //control right bjts
int pot_lum = A1; //Potentiometer for controlling the intensity of light
int pot_delay = A2; //Potentiometer for controlling the frequency of switching
int val;
int delay_light;


void setup() {
  pinMode(phase1, OUTPUT);
  pinMode(phase2, OUTPUT); 
}

//Only 2 of 4 bjt at any instant are on. This allow the current to flow in the lights in 2 different direction, alternating the colors
void loop() {
  val = analogRead(pot_lum);
  delay_light = analogRead(pot_delay);
  delay_light = delay_light*2;
  analogWrite(phase1, val/4); //left bjts on
  digitalWrite(phase2, LOW);  //right bjts off
  delay(delay_light);         //wait                     
  digitalWrite(phase1, LOW);  //left bjts off  
  analogWrite(phase2, val/4); //right bjts on
  delay(delay_light);         //wait              
}