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 Electronics
 Power Supply
 Use LED driver as normal power supply
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Ashirdaniel
Apprentice

India
60 Posts

Posted - Oct 10 2017 :  10:00:30 PM  Show Profile  Send Ashirdaniel an AOL message  Reply with Quote
Hi , can we use an LED driver as power supplies for amplifiers such as LM386? Its 12v 2A and very cheap( 1 dollar) compared to a DIY one whose transformer alone costs ₹200 ( 3 dollar) . If we can use them, do we need to add extra filter capacitor near the amplifier?.

Dany

Aaron Cake
Administrator

Canada
6702 Posts

Posted - Oct 12 2017 :  09:17:06 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
It depends on the driver. Most of them are just switching supplies with PWM capability on the output. Post a like to the driver. The LM386 requires little power though and runs on a wide variety of voltages. What about just using a spare power adapter from some broken device?
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Ashirdaniel
Apprentice

India
60 Posts

Posted - Oct 12 2017 :  09:44:35 AM  Show Profile  Send Ashirdaniel an AOL message  Reply with Quote
Because its very small. Takes only half or less space than transformer-rectifier board combo. And only costs 20%. it looks like smps . Very light. Totaly Covered with plastic . Its not branded.

Dany
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - Oct 13 2017 :  09:21:14 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Can you post a picture? The ones I have seen have an adjustment for voltage and current limit. As long as the output isn't PWM, then it should be fine. If the output is PWM, then you'd need to add a hefty filter capacitor to smooth it out. Which may confuse the supply as it won't be expecting to drive a capacitive load.
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Ashirdaniel
Apprentice

India
60 Posts

Posted - Oct 18 2017 :  3:00:16 PM  Show Profile  Send Ashirdaniel an AOL message  Reply with Quote
trying to add picture but this shows
Request object error 'ASP 0104 : 80004005'
Operation not Allowed
/forum/outputFile.asp, line 13

Dany
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Ashirdaniel
Apprentice

India
60 Posts

Posted - Oct 18 2017 :  3:02:15 PM  Show Profile  Send Ashirdaniel an AOL message  Reply with Quote
this one dosnt have ny adjustment at all

Dany
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Oct 18 2017 :  9:22:48 PM  Show Profile  Reply with Quote
12V is too high to power an LM386 unless the speaker is 16 ohms because the LM386 will become too hot.
The datasheet shows that with an 8 ohm speaker the heating increases when the supply is more than 9V but the maximum output power stays almost the same.
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