I'm contemplating the HV57009 for my upcoming VFD clocks; it requires a negative supply so that presents some challenges but a single device can drive 64 segments at 2mA each.
On Saturday, January 30, 2021 at 9:48:06 AM UTC-8 [email protected] wrote: > Thanks Davis; I think I have a solution but will look at your suggestion. > The CD4543 seemed to only drive a milliamp or less but I found I had six > MC14543B which will drive 10mA source or sink. > This should do it. I will need to find out what anode voltage I need and > choose a power supply, probably running off 5v. > Pin 6 (PHase) sets either active high or active low outputs. It is driven > by a square wave for LCD displays. > I left out that my intention is to add a selection of LEDs that will be in > the opening at the front. > I'm off to test the circuit. Peter. > [image: VFD IV12 Schematic.jpg] > [image: 20201227_104715.jpg] > > On Sat, Jan 30, 2021 at 11:19 AM David Pye <[email protected]> wrote: > >> Hi Peter, >> >> For my vfd clock project (https://github.com/davidmpye/VFD), I used the >> following high side driver ICs (I used one per tube but of course I >> could've multiplexed) >> >> They are either known as UDN2981 and there's also a Toshiba version >> (TDSsomething). They aren't BCD though - just one pin per segment, so that >> might not be any good for your application depending on how many IO pins >> you have spare .. >> >> David >> >> On Sat, 30 Jan 2021, 00:57 peter bunge, <[email protected]> wrote: >> >>> I need to drive a single IV12 vacuum fluorescent display from a BCD to 7 >>> segment chip. >>> I could use level shifters like the CD40109B or CD4504B but they don't >>> have 7 devices in one chip (4 and 6) and only drive 18 volts which might >>> work. >>> I could use a ULN2803 transistor array with 7 pullup resistors on the >>> outputs. The problem is the BCD to 7 decoders (e.g. CD4511) are usually >>> active high, which I need, but the ULN2803 is an inverter which I don't >>> need. A CD4543B might work as the BCD to 7 and can be selected for inverted >>> outputs but it is designed for LCDs not driving transistors. >>> The 74LS47 has the right polarity to drive the transistor array but it >>> has open collector outputs so 7 more resistors are required. >>> Any suggestions that don't get even more complicated (shift registers, >>> octal inverters, arduinos, etc) >>> I'm looking for a convenient driver chip. >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "neonixie-l" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web, visit >>> https://groups.google.com/d/msgid/neonixie-l/272c6223-da83-44e2-b180-dfb3bc46b40en%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/neonixie-l/272c6223-da83-44e2-b180-dfb3bc46b40en%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> > To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0G4aQbJt3BHbcZCi7qFZ971SyYfDCdw-UZfOPiFB4GXZQ%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0G4aQbJt3BHbcZCi7qFZ971SyYfDCdw-UZfOPiFB4GXZQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/47bb1981-ad81-4f16-89f2-7976148775afn%40googlegroups.com.
