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Old 07-13-2014, 01:31 PM #1
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Default LPM circuit

I have designed an lpm circuit on bases of this:



Can anyone tell me if this circuit is correct and will it work ?????




Last edited by hamzajaved780; 07-13-2014 at 04:11 PM.
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Old 07-13-2014, 03:58 PM #2
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Default Re: LPM circuit

Those pot footprints don't look like multi-turn pots. You'll want one for the 10k calib pot.
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Old 07-13-2014, 04:12 PM #3
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Default Re: LPM circuit

Now what about this one



Also ARG is this circuit correct and which LM358 to use A or B??
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Old 07-13-2014, 04:21 PM #4
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Default Re: LPM circuit

A or B does not really matter IMO.


For the unused op amp you should tie the -IN to the output and the +In to common. It will rail the op amp low so that it does not cause noise, as the way you have it will rail it in an unknown state cause noise.

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Old 07-14-2014, 11:19 AM #5
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Default Re: LPM circuit

Hey ARG i am kinda noob to it so can you explain it on the circuit via some lines. I will be very thankful to you
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Old 07-14-2014, 04:04 PM #6
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Default Re: LPM circuit

Like this, for the unused one.

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Old 07-14-2014, 05:11 PM #7
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Default Re: LPM circuit

Quote:
By Juffran88
This is actually my second attempt at this since my first one didn't work so well. My first attempt failed because of an improper connection made on the second (unused) op-amp on the LM358.



I first had the unused op-amp with one input to GND and the output feed back into the other input like this:


That didn't work and actually made the IC extremely hot and readings fluctuated erratically. I gave up after that failed try, but after a month or so the topic came up and a few members helped me out. It seems that a dual op-amp IC like the LM358 won't work correctly since both op-amps feed from the same power supply, but would work with a single op-amp IC.
My DIY Laser Power Meter ***PIC HEAVY***

I am kind of confused what to do

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Old 07-14-2014, 05:13 PM #8
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Default Re: LPM circuit

What Juffran had got there is correct.
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Old 07-15-2014, 11:29 AM #9
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Default Re: LPM circuit

So which circuit to use

This one (NO 1)




Or this one (No 2)
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Old 07-15-2014, 04:32 PM #10
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Default Re: LPM circuit

Number 2
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Old 07-15-2014, 06:00 PM #11
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Default Re: LPM circuit

Thanks
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