Jump to content
ELFORUM - Forumul electronistilor

vu-metru pe 3 benzi de frecventa


Guest tstorm881989

Recommended Posts

Guest tstorm881989

salut

 

am terminat de curand un vu-metru pe 3 benzi de frecventa (joase medii inalte) cu LM3915. Singura problema pe care o am consta in etalonarea celor 10 leduri. Schema fiind cea de la pagina 2 (Scuze dar nu mi merge momentan sa atasez nimic p forum icon_toilet )

 

la pag 4 in datasheet http://www.datasheetcatalog.com/datashe ... 3915.shtml exista un tabel cu tensiuni de prag corespunzatoare celor 10 leduri. Vroiam sa intreb daca tabelul este valabil si in cazul in care modific tensiunea de referinta Vref din divizorul de tens R1 R2.?(de la 1,25 la 2,5 V de exemplu_

 

multumesc anticipat.

Link to comment
  • Replies 3
  • Created
  • Last Reply

Top Posters In This Topic

  • niq_ro

    1

Top Posters In This Topic

daca schimbi tensiunea de referinta o sa ai alte praguri de tensiune.. cred ca e logica treaba... ce praguri de tensiune vrei sa ai?

 

acolo scria asa: Note 2: Accuracy is measured referred to 0 dB e a 10.000 VDC at pin 5, with a 10.000 VDC at pin 6, and 0.000 VDC at pin 4. At lower full scale voltages, buffer

and comparator offset voltage may add significant error. See table for threshold voltages.

Link to comment

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.Terms of Use si Guidelines