Ha, that's a good point, thanks! Do you think I should throw a pulldown on the gate of Q1 to solve that?
On Tuesday, June 9, 2015 at 5:46:52 PM UTC-4, nixiebunny wrote: > > Brian, > > A lower soldering time option for the transistors is the TD62084, which > has > eight 50V transistors in a 18 pin DIP or TSSOP. The SN75468 has seven 100V > transistors in a 16 pin DIP. > > Other than that, it looks like it will work, as long as you have a > guarantee > that your boost converter FET gate will not be enabled for longer than a > few > microseconds incase the CPU goes stupid. > > There is a story about that - the folks who beat the roulette wheel using > physics (read The Eudaemonic Pie) built a computer in a bra, but the > tapping > solenoids that communicated to the wearer would stay engaged when the CPU > crashed. Hot! Ouch! A series capacitor and a pulldown resistor on the > transistor's input solved that problem. > > On 6/9/2015 2:23 PM, Brian wrote: > > Thanks for letting me know that parts exists. I didn't know they were > > making combo parts like that. I will probably stick with the design I > have > > for now...Newark has the BSS131 on sale for $0.063, and the 74HC595 on > sale > > for $0.066, which means 32-bits of output costs $2.28. The lowest price > I > > could find for the HV5522 was $5.53, though I guess the cost is made up > in > > solder time :-). > > > > (I also already have the 24V adapter and no 12V rail.) > > > > Thanks for the comments, you should post your preliminary design too! > > > > -Brian > > > > On Tuesday, June 9, 2015 at 4:52:53 PM UTC-4, gregebert wrote: > >> > >> Others have used the HV5522 (I'm designing with the HV5530) because it > >> combines the shift-register with the HV driver. The only drawback is > that > >> you have to level-shift the inputs to the HV55xx to 12V. I'm using > >> comparators for that; have yet to run spice simulations to optimize for > >> noise-rejection, etc. > >> > > > > -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/228d47af-59ad-463d-9791-41321a70faca%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
