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Topic: LM324N (quad switch IC) (Read 1 time) previous topic - next topic

JMD1

Hello guys, today I unsoldered a microchip from an old board, named LM324N. Its not a programmable chip but a switch or something like this. From what I have read the IC I have can be used to amplify voltage. I tried to wire it just like its written in the schematics but from 5V I get 3.8V 0_o
Actually, right now I need a voltage amplifier to amplify 5V of the Arduino pin to exactly 15V (or atleast 12V if 15 not possible).
For those who are familiar, please explain me how this would be possible? If resistors are needed, soon I will have resistors varying from 10 to 1M ohms so tell me the exact resistance needed.
Thank you anyway.

srnet

#1
Mar 12, 2017, 05:58 pm Last Edit: Mar 12, 2017, 05:59 pm by srnet
The LM324 has been around since the 70s, there are books about it and heaps of stuff on the Internet on how to use it.

Google 'LM324 Circuits' for lots of info.

Yes it can be an amplifier, but you wont get more voltage out of it than is on the supply rails.

It would 'amplify' 1V by 3 to give 3V output, but with a 5V supply you wont get more than about 4V output.

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DrAzzy

No "amplifier" will give you a voltage outside the supply rails. If you need to create 12v from 5v, you need to either use a boost converter (cheap DC DC converters come from ebay), or start with 12v (this could be used to get 5v via either buck converter or linear regulator)

If you're switching power to something, use a Mosfet not an amplifier
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MarkT

Actually, right now I need a voltage amplifier to amplify 5V of the Arduino pin to exactly 15V (or atleast 12V if 15 not possible).
You sure you don't just need a level shifter?  Is this an analog signal (in which case you have a DAC or
a low-pass-filtered PWM output?)  Or is it digital (level shifter is what you need)?
Or is it power?
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

KeithRB

No "amplifier" will give you a voltage outside the supply rails. If you need to create 12v from 5v, you need to either use a boost converter (cheap DC DC converters come from ebay), or start with 12v (this could be used to get 5v via either buck converter or linear regulator)

If you're switching power to something, use a Mosfet not an amplifier
Not quite true. RF amplifiers with inductive bypassing will routinely supply twice the supply voltage. Won't help in this case, though. 8^)

westfw

Quote
Can anyone share some good tutorial on LM324 as I have been working on it and it seems quite good and cheap. So share some good links please especially if there's some Proteus simulations available for LM324.
It's a GENERAL PURPOSE op-amp, so you should also look for tutorials on op-amps in general.
They're very powerful analog components!  (and also a big part of most EE curricula, so textbooks will talk about them.)

Op Amps for Everyone
The Signal e-book: A compendium of blog posts on op amp design topics
TI Circuit Cookbook: Op Amps

uxomm

Thank you for the hint to these books!

Some of the links did not work, so here are working links i found:
Op Amps For Everyone
TI Circuit Cookbook: Op Amps
Always decouple electronic circuitry.

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