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Class D Switching Power Amplifiers and Power D/A conversion

Trying to figure out a solution to a small circuit
Trying to figure out a solution to a small circuit
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Old 17th March 2018, 09:24 AM   #1
Wuchan is offline Wuchan
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Join Date: Mar 2018
Default Trying to figure out a solution to a small circuit

I am extremely new to electronics, I have been trying to figure out a solution to a small circuit I am trying to mod for the Gameboy color. The GBC has a very low speaker output. Using the PAM8302 (a class-d sound amp datasheet: http://www.kynix.com/uploadfiles/pdf...M8302AADCR.pdf), I connect the RIN (U3 pin 7) to IN- of the PAM8302 and PAM8302 OUT+/- to the speaker. The sounds works great, but when I want to plug in my headphones it plays through both the speaker and the headphone jack.

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In the original circuit the headphone output is disabled by the headphone jack via Pin 6 of U3 being pulled down by pin 4 of the phone jack. When the phone jack is inserted, the pin is no longer pulled to ground thus disabling the speaker. I need to apply a modded circuit to act the same way to the new amp I am installing. I would like the switch in the phone jack to disable the speaker amp I installed. I wanted to use a transistor to toggle the PAM8302 enable pin (5v enabled; 0v disabled), so when the headphone jack is in the PAM8302 is disabled and vice versa. Also, FYI the output of U3 pin 6 is 0.7v

I thought a transistor might do the job, but I am not sure if I am being realistic.

I really hope I have been clear here; any suggestions are appreciated greatly.
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Old 17th March 2018, 10:06 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Location: The Jurassic Coast, England. GB
Your schematic doesn't use the PAM chip that has 8 pins. It is something different. Without knowledge of part number, could be anything.
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