IV-17 sockets WAS Re: New file uploaded to smartsockets
> A solution for the decimal point drivers could be using a UDN2981 or UDN 2982/2 instead of a bunch of transistors and resistors.Hi Roger,
> These are octal high-side drivers specified up to 50V and available in SMD.
> UDN 2983/4 can even switch uo to 80V.
Because the tubes are multiplexed then I only need two decimal point switches to control all 8 DP's. My previous DP switch actually shorted them to ground and when not shorted the power was supplied via a pull up resistor. Crude but good enough for prototyping. Now i just need to add two pnp's and a couple of resistors to make it less power hungry. It's only 4 transistors in total for all 8 DP's
>At the moment I have not used the blanking input of the HV5812 but as long as it can be switched quickly enough I have plans to use that for dimming. i know what yiou mean about thebedroom situation...bright tubes look great in the daytime but make yiou feel like you're living in times square other times.
> With such an approach the voltage could be influenced with the duty-cyle of a PWM-output of the controller. So one could have another "feature" for dimming the VFDs.
> This is of course not very important for a "showcase"-display, but if You have it in Your bedroom...
> I have fitted nearly all of my nixie- and VFD-clocks with an LDR-regulated automatic dimming to extend the lifetime of the displays and for "bedroom-usage".
If I cannot get the blanking pin trick to work I think the 45V psu can easily be modded to switch in or out another resistor to give a simple two level brightness under software control.
I just hope that i get the time to implement these things soon !
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a file has been uploaded to the Files area of the smartsockets
File : /B-5971/README.TXT
Uploaded by : cyberb0 <radmeck@...>
Description : IF YOU DARE! - 04.21.2014
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