Quick question!

[xXBrunoXx]

Hi, I needed voltage regulators positive and negative 15v I think for my active filter ( high pass , low pass ) to power the op-amps.
This is all I could find at the moment in stock, are they fake? , china versions, Good enough to use them ? or should I trow them in the bin.

Also, how about just transformer - bridge rectifier - a couple of capacitors = dc -+ 12 - 15v ?. or you recommend Voltage regulators?.

 

[NanoFarad]

Fake seems to me. If current demand is low you can use zener for regulation.

 

[chrisng]

Hi, I needed voltage regulators positive and negative 15v I think for my active filter ( high pass , low pass ) to power the op-amps.
This is all I could find at the moment in stock,

Really?
https://www.digikey.ro/en/products/detail/stmicroelectronics/L7915CV/585999
https://www.digikey.ro/en/products/detail/stmicroelectronics/L7815CV-DG/2832890

https://www.digikey.ro/ro/products/detail/stmicroelectronics/L7812CV/585973
https://www.digikey.ro/ro/products/detail/stmicroelectronics/L7912CV/585997

 

[chrisng]

china versions, Good enough to use them ? or should I trow them in the bin.

Can anybody tell you if a component functionable or not just based on an image?
Can't you test it?

 

[xXBrunoXx]

@chrisng Of course I can test them, but I wanted to ask if they seem fake to you guys.
I live in Romania and that's what I could order at the moment.

 

[xXBrunoXx]

Anyway, I found genuine 7909/7809 from some old boards/ Might use that for now.

 

[NanoFarad]

I see know problem. Normally you don't need more than 250mv- 2volt for signal in.