user27157: I have a TM1638 board with 8 seven-segment displays, 8 LEDS, and 8 buttons. Each time multiples leds are on, the board makes an annoying high pitch sound.
I'm controlling it with an Arduino Uno.
Should I worry about the sound and is it normal?
This is my board : 


user79789: This thread is getting old but this LED&KEY device seems to still be fairly popular so this may still help someone else. I'm using one to control a radio receiver and the constant buzz can get pretty loud.
I found this article (A second look at the TM1638 LED & key controller) which mentions the same issue which was solved by inserting a 100Ω resistor between VCC and the VCC pin. I also added a 1000μF electrolytic capacitor across the VCC and GND pins (well, fairly close to them anyway). This quieted down the buzz a lot though it's still there. The resistor is key though the capacitor helps a bit.
I also tried moving the breadboard connections to a separate, smaller breadboard, away from the MCU and radio receiver chip and was able to use lower values (10Ω and 47μF). I was no longer able to hear the buzz at all.

27157: <p>I have a TM1638 board with 8 seven-segment displays, 8 LEDS, and 8 buttons. Each time multiples leds are on, the board makes an annoying high pitch sound.</p>

<p>I'm controlling it with an Arduino Uno.</p>

<p>Should I worry about the sound and is it normal?</p>

<p>This is my board : </p>

<p><a href="https://i.stack.imgur.com/OZfkg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OZfkg.png" alt="enter image description here"></a></p>
 79789: <p>This thread is getting old but this LED&amp;KEY device seems to still be fairly popular so this may still help someone else. I'm using one to control a radio receiver and the constant buzz can get pretty loud.</p>
<p>I found <a href="https://nerdralph.blogspot.com/2018/06/a-second-look-at-tm1638-led-key.html?lr=1" rel="nofollow noreferrer">this article</a> (A second look at the TM1638 LED &amp; key controller) which mentions the same issue which was solved by inserting a 100Ω resistor between VCC and the VCC pin. I also added a 1000μF electrolytic capacitor across the VCC and GND pins (well, fairly close to them anyway). This quieted down the buzz a lot though it's still there. The resistor is key though the capacitor helps a bit.</p>
<p>I also tried moving the breadboard connections to a separate, smaller breadboard, away from the MCU and radio receiver chip and was able to use lower values (10Ω and 47μF). I was no longer able to hear the buzz at all.</p>
