This one will work for operating the display at 3.3V and 5V. It'sabout $0.60 more that the strictly 3.3V driver board.DR. WILLIAM J. SCHMIDT - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZPJ2/K9HZ VP2EHZOwner - OperatorBig Signal Ranch - K9ZCStaunton, IllinoisOwner - OperatorVilla Grand Piton - J68HZSoufriere, St. Lucia W.I.Rent it: www.VillaGrandPiton.com [1]Moderator: North American QRO Group at Groups.IO.Moderator: Amateur Radio Builders Group at Groups.IO.email: bill@...Links:------[1] [2] /g/AmateurRadioBuilders/message/5985[3] /mt/111046417/243852[4] /g/AmateurRadioBuilders/post[5] /g/AmateurRadioBuilders/editsub/243852[6]/g/AmateurRadioBuilders/leave/11522011/243852/920863695/xyzzy