u/IllustriousTune156

I live in a small studio apartment and I’m noticing that whenever I run the washer/dryer I can periodically hear every one to two minutes a bit of a zap coming from my speaker system across the room. It sounds like a pretty quiet zap

Does anyone have any ideas how I can remedy this and if this scenario implies any danger at all?

It seems like the use of the washer/dryer is somehow causing a small surge that is discharging in my speakers. If anyone is able to help me understand what’s going on here and what factors I should consider that would be great!

const int LED1 = 8;                               //LEDs 1 & 2
const int LED2 = 9;                               //digital output pins 8 & 9


const int s1 = 2;                                 //switch s1 = Save Button to store Preset 1 or Preset 2 (depending on s6 position)
const int s5 = 6;                                 //switch s5 = mode switch, up = Run Mode, down = Program Mode
const int s6 = 7;                                 //switch s6 UP = Preset 1, down = Preset 2


const int vr1 = 0;                                //vr1 = speed flash rate adjuster


int rawV;                                         //declares variable called rawV (raw value)
int scaledV;                                      //declares variable for scaledV (scaled value)


bool bs1;
bool bs5;
bool bs6;


void setup() {
  pinMode(8, OUTPUT);                             //sets LED1 (digital pin 8) as an output 
  pinMode(9, OUTPUT);                             //sets LED2 (digital pin 9) as an output 
  pinMode(A0, INPUT);                             //sets vr1 (analog pin 0) as an input.      ************* do i need to declare analog pinMode?
  pinMode(s1, INPUT_PULLUP);                      //set s1 (digital pin 2) as an input (ensures pin reads HIGH by default)
  pinMode(s5, INPUT);                             //set s5 (digital pin 6) as an input
  pinMode(s6, INPUT);
  Serial.begin(9600);
}
void loop() {
  programMode1 ();                                //calling programMode1 function


                                                  //PROGRAM MODE 1*
}    //read vr1 and convert values to flash LEDs at variable rate
void programMode1 (void)
{
  rawV = analogRead(A0); /sets rawV (raw value) to be read from vr1 (A0
  scaledV = map(rawV, 0, 1023, 50, 500); //defines scaledV
  digitalWrite(LED1, HIGH);         //turns LED1 on (sets pin 9/LED1 to 5V)
  delay(scaledV); //pause LED1 on for 50-500 ms (scaled value according VR1
  digitalWrite(LED1, LOW);                        //turns LED1 off (sets pin 9/LED1 to 0V)
  delay(scaledV);                                 //pause LED1 off for 50-500ms (scaled value according to position of vr1)
                                                  //save/store the flash rate into Preset 1 and Preset 2
  Serial.println(scaledV);
  delay(scaledV);


  bs1 = digitalRead(2);
  bs5 = digitalRead(6);
  bs6 = digitalRead(7);
                                                   //PRESET 1, save rate (s6 UP/preset 1) and confirm with LED2 flash*************************************************************
  if(bs1 == true && bs5 == false && bs6 == true )  //if s1 is pressed, s5 is down (PRGM), and s6 is up (PRESET 1)
  {                                       //then
    digitalWrite(LED1, HIGH);             //flash LED1
    delay(scaledV);
    digitalWrite(LED1, LOW); 
    delay(scaledV);
    
    digitalWrite(LED2, HIGH);                      
    delay(100);
    digitalWrite(LED2, LOW); 
    delay(100);
    digitalWrite(LED2, HIGH);                      
    delay(100);
    digitalWrite(LED2, LOW); 
    delay(100);
    digitalWrite(LED2, HIGH);                      
    delay(100);
    digitalWrite(LED2, LOW);
  }
}

i need help on how to save/store a value to a dedicated switch position as outlined below for program mode. The code block i posted is where im at right now I just don't know how to make it remember/store the scaled rate or assign that particular rate to stay on that switch position.

https://preview.redd.it/s6wjmu63by1h1.png?width=1092&format=png&auto=webp&s=1ca09ab49e380febc6f56355a949c6fd091c3577

Doing a radio kit as one of my first projects. One of the first components I measured is reading 89 ohms but it’s supposed to be 100 with a tolerance rating of 5%. Should I just continue in soldering the board or should I actually take time to find the appropriate resistor and have to special order it?

Would you give the same advice if you were building a modular synthesizer that you plan to keep forever?

Any links to a behringer rd9 schematic floating around out there??

I really want to tear this thing apart to fix an issue with the ride vol potentiometer, but I don't want to get caught with my pants down once I open it up and not be able to have any sense of understanding the circuit board.

It should be a relatively simple procedure I just want to check first just in case anybody out there has any pointers...Thanks.