Arduino Forum

Using Arduino => General Electronics => Topic started by: snyfir on May 19, 2019, 12:06 pm

Title: Mosfet to switch off audio amplifier
Post by: snyfir on May 19, 2019, 12:06 pm
Hello every body,

To preserve noise and consumsion when the audio amplifier TD2030A (https://www.banggood.com/DIY-TDA2030A-Audio-Amplifier-Board-Kit-Mono-Power-18W-DC-9V-24V-p-1065189.html?rmmds=myorder&cur_warehouse=CN) is not used i have try to use a IRLML2502 (https://fr.rs-online.com/web/p/transistors-mosfet/3958851/) mosfet.
I connected the two thinks together like the attach file.
but when i try it the arduio crash and when i connect the gate to the ground the audio amplifier is still working. Did i do something wrong ?

Thank for your help


Title: Re: Mosfet to switch off audio amplifier
Post by: PaulRB on May 19, 2019, 01:53 pm
(https://forum.arduino.cc/index.php?action=dlattach;topic=616705.0;attach=308867)
That schematic looks ok but it is not complete. No Arduino is shown and we cannot tell which pins of the amplifier are connected. Please post a more complete schematic. Hand-drawn is fine. Also post pictures of the circuit that are well lit and well focused, so we can see where each wire is connected.
Title: Re: Mosfet to switch off audio amplifier
Post by: Paul__B on May 19, 2019, 02:14 pm
Low side switching.

This is going to end in tears!  :smiley-eek:
Title: Re: Mosfet to switch off audio amplifier
Post by: PaulRB on May 19, 2019, 07:40 pm
Paul, please explain.
Title: Re: Mosfet to switch off audio amplifier
Post by: jremington on May 19, 2019, 07:44 pm
I recommend to instead use a Pololu Power Switch (https://www.pololu.com/category/121/pololu-power-switches).
Title: Re: Mosfet to switch off audio amplifier
Post by: Paul__B on May 20, 2019, 12:51 am
Paul, please explain.
Remember "phantom powering"?  This device is an audio amplifier.

Please explain (https://www.youtube.com/watch?v=pfNoto58fQM)
.