Am I driving this chip with too much voltage?

Hacdrag · May 30, 2022

I'm running some small Amp boards with a 12 V wall adaptor. My multimeter has it outputting 12.38 V. The datasheet for the chip on the board has operating voltage 4V-12V with an absolute maximum rating of 15 V. I've tested it for an hour or so with no problems but am wondering whether I'm pushing the envelope. Am I in danger of releasing some "magic smoke," or in general, are these kind of setups OK?

Pommie · May 30, 2022

Do you have a link to the amp?

Mike.

Hacdrag · May 30, 2022

Pommie said:
Do you have a link to the amp?

Mike.

Here is the datasheet for the chip:

NJM386D pdf, NJM386D Description, NJM386D Datasheet, NJM386D view ::: ALLDATASHEET :::

NJM386D Datasheet, NJM386D datasheets, NJM386D pdf, NJM386D integrated circuits : NJRC - LOW VOLTAGE AUDIO POWER AMPLIFIER ,alldatasheet, Datasheet, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs and other semiconductors.

pdf1.alldatasheet.com

Here is the link to the actual product:

Home

Low Voltage Mono Audio Amplifier Board NJM386D LM386 - Ideal for Battery OperationThe projects are endless for this low voltage mono audio amplifier board. Make your own amplified mini speaker powered by 5 VDC. Use the USB port on your computer to make your own computer speaker. Use two boards...

www.parts-express.com

Dick Cappels · May 30, 2022

Though you exceed the recommended voltage by about 5% (which is not much) you are still a long way from the absolute maximum rating. I think it will be fine.

audioguru · May 31, 2022

The datasheet of the NJM386 Japanese copy of the American LM386 does not show it with a 12V supply.
The American datasheet shows it heating with 0.8W with a 12V supply when the ambient is air conditioned which will overheat the "DIP8" IC that is rated with 0.7W maximum allowed heating.

It produces almost the same 0,5W of maximum undistorted output with a 9V supply as the 0.6W output with a 12V supply. Use a 9V supply instead.

Hacdrag · May 31, 2022

audioguru said:
The datasheet of the NJM386 Japanese copy of the American LM386 does not show it with a 12V supply.
The American datasheet shows it heating with 0.8W with a 12V supply when the ambient is air conditioned which will overheat the "DIP8" IC that is rated with 0.7W maximum allowed heating.

It produces almost the same 0,5W of maximum undistorted output with a 9V supply as the 0.6W output with a 12V supply. Use a 9V supply instead.

Good idea - better not to release any "magic smoke."

Ty

Am I driving this chip with too much voltage?

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NJM386D pdf, NJM386D Description, NJM386D Datasheet, NJM386D view ::: ALLDATASHEET :::

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