Guest tstorm881989 Posted October 19, 2009 Share Posted October 19, 2009 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
Guest tstorm881989 Posted October 19, 2009 Share Posted October 19, 2009 asta e schema.. Link to comment
Guest tstorm881989 Posted October 20, 2009 Share Posted October 20, 2009 nimeni n-a mai facut vu-metru cu LM3915??.. daca ii schimbi tensiunea de referinta cum il etalonezi ? anyone? Link to comment
niq_ro Posted October 28, 2009 Share Posted October 28, 2009 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
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