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Old 4th October 2004, 10:13 PM   #1
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Default LM555 car amplifier power supply

i have a old amp with upper Volt 12V to 25V + -

it is work it LM555.

where can i find this schmetic....... to build a car amp power supply with LM555

thanks
tamir
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Old 5th October 2004, 08:02 AM   #2
jaycee is offline jaycee  United Kingdom
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It will be a switch mode supply using the 555 as a crude Pulsewidth Modulator (PWM). If you look on Google you will probably find quite a few schematics of this kind.

Better though would be to build a switch mode supply on a better chipset, if chips are difficult to get in your country look to the TL494 as they are common in PC power supplies (I have several of them from otherwise dead PC psu's )
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Old 5th October 2004, 08:18 AM   #3
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The 3842 / 3843 family is available from lots of manufacturers all over the world at low cost. It's a very easy chip to use with plenty of helpful app-notes, and ideal for stepping 12V up to 25v.
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Old 5th October 2004, 10:17 PM   #4
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thanks all
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