Old 02-02-2011, 10:31 PM #1
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Default LM340 Regulator?

So, i salvaged 7 LM340 regulators out of some junk audio equipment at work today. Are they any use for making laser drivers? I am not extremely well-versed in the details of electronic components, so comparing datasheets with the 317 tells me nothing useful. can the 340 be used in the same applications?


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Old 02-02-2011, 11:00 PM #2
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Default Re: LM340 Regulator?

It doesn't look like they are variable regulators, so no.
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Old 02-02-2011, 11:56 PM #3
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Default Re: LM340 Regulator?

You sure they are LM340's or are they LM350's?
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Old 02-03-2011, 02:23 AM #4
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Default Re: LM340 Regulator?

they are stamped lm340
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Old 02-03-2011, 02:35 AM #5
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Default Re: LM340 Regulator?

Ok then thats too bad the LM340's can be used as a current source, but it's not practical in Our interests to try an use one based on Voltage and Load requirements. LM350's on the other hand would be just fine for a high current draw laser diode.
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