I agree. It's probably very unlikely that you'll damage an output by simply
pulling too much current. I guess the internal resistance is too high to
cause immediate destruction of the output FET. I didn't have any problems
with the logic either. Just too high voltage drop across the '595
Regarding using the 74HC595s, it's true that they are technically out of
spec if too many segments are on, but I believe the failure cause would be
whole chip heating rather than the single output transistors, and
especially with the PWM dimming going on (the segments are never on 100%,
since
I’ve had great experience with the TPIC6B595s, I used them to drive a whole
bunch of miniature bayonet style bulbs for a clock using IEE one plane
readouts, no problems with them so far. Probably a little over 120 mA per IC.
> On Aug 17, 2022, at 8:12 PM, Christian Riise Wagner
> wrote:
>
>
Even running more than 3 segments @20mA is actually out of spec as the
maximum ground and source current for the 74HC595 is 70mA. I found that it
didn't work satisfactory for an IV-19. Too high a voltage drop. Might be
okay for smaller numitrons though. I've ordered some TPIC6C595 instead to
Don't numitrons have pretty high shoot-through current? I'd expect 100mA of
current going into the IC pins at each off-on transition. Which would
probably be fine since it's only for a few milliseconds and as you
mentioned it's been fine for years, but it's technically out of spec.
On Monday,
If bit-banging is done serially, you can avoid most timing problems
by-design. However, if the controller has an 8-bit parallel-output port,
and data is changed on the same cycle as your sampling clock-edge (usually
rising-edge, but HV5530 and similar use falling-edge) you create a race
I almost invariably use daisy-chained 74HC595s in my clocks. I use
Numitrons rather than Nixies, which can be direct-driven with 5 volts, and
an 8051 variant (AT89C4051) because I have lots of them and a tool chain
I'm comfortable with; they're programmed in C. To drive the clock, data,
and
The most sensible low-cost direct drive arrangement in terms of parts count
and board layout is SOIC 74HC595 shift registers and SN75468 HV driver
arrays.
There's a Chinese Zirrfa 6 digit clock board that uses this approach.
On Mon, Aug 15, 2022, 7:09 AM David Pye wrote:
> Given the price of
gt;> measurement tools).
>>
>> Thanks everyone for jumping in with so many suggestions.
>>
>> I'll send a pic of my clock when ready.
>>
>>
>>
>> Original message
>> From: "SWISSNIXIE - Jonathan F."
>> Dat
>
> Of course with 8 steppers * 4 wires each…. It’s a jumbled mess in
> prototyping.
>
>
>
> Michail
>
>
>
> *From:* neoni...@googlegroups.com *On Behalf
> Of *Richard Scales
> *Sent:* Saturday, August 13, 2022 9:42 PM
> *To:* neonixie-l
> *Subjec
@googlegroups.com On Behalf Of
Richard Scales
Sent: Saturday, August 13, 2022 9:42 PM
To: neonixie-l
Subject: Re: [neonixie-l] Re: Nixie Clock - Direct Drive HV5530
I've used HV5522 and HV5622 a lot without any issue - I always use a CD40109B
level shifter to convert from 3v3V or 5V to 12V (I know many do
ping in with so many suggestions.
>
> I'll send a pic of my clock when ready.
>
>
>
> Original message
> From: "SWISSNIXIE - Jonathan F."
> Date: 13/08/2022 22:16 (GMT+00:00)
> To: neonixie-l
> Subject: Re: [neonixie-l] R
and measurement tools). Thanks
everyone for jumping in with so many suggestions. I'll send a pic of my clock
when ready.
Original message From: "SWISSNIXIE - Jonathan F."
Date: 13/08/2022 22:16 (GMT+00:00) To: neonixie-l
Subject: Re: [neonixie-l] Re: Nixie Clock -
Direct Dr
code is open source, I'll just use that otherwise I'll adapt mine
> to use hv5530 and hef4104.
>
> Awesome!
>
>
> Original message
> From: "SWISSNIXIE - Jonathan F."
> Date: 13/08/2022 20:51 (GMT+00:00)
> To: neonixie-l
> Subject:
!
Original message From: "SWISSNIXIE - Jonathan F."
Date: 13/08/2022 20:51 (GMT+00:00) To: neonixie-l
Subject: Re: [neonixie-l] Re: Nixie Clock -
Direct Drive HV5530 The time to shift out the bits is not critical, the clock
rate is as fast as you implement it, the
multiplexing
using high voltage transistors on anodes and cathodes of the nixies? Other than
saving component and uC pins, of course. Original message
From: Bill Stanley Date: 13/08/2022 17:32
(GMT+00:00) To: neonixie-l Subject: [neonixie-l]
Re: Nixie Clock - Direct Drive HV5530 I
From: "SWISSNIXIE - Jonathan F."
Date: 13/08/2022 20:51 (GMT+00:00) To: neonixie-l
Subject: Re: [neonixie-l] Re: Nixie Clock -
Direct Drive HV5530 The time to shift out the bits is not critical, the clock
rate is as fast as you implement it, there is only a minimum
parallel converter+shift register vs multiplexing using high voltage
>> transistors on anodes and cathodes of the nixies? Other than saving
>> component and uC pins, of course.
>>
>> Original message ----
>> From: Bill Stanley
>> Date: 13/08/2022 17:3
ift register vs multiplexing using high voltage
> transistors on anodes and cathodes of the nixies? Other than saving
> component and uC pins, of course.
>
> Original message
> From: Bill Stanley
> Date: 13/08/2022 17:32 (GMT+00:00)
> To: neonixie-l
el converter+shift register vs multiplexing using high voltage
> transistors on anodes and cathodes of the nixies? Other than saving
> component and uC pins, of course.
>
> Original message
> From: Bill Stanley
> Date: 13/08/2022 17:32 (GMT+00:00)
> To: neonixi
Stanley
Date: 13/08/2022 17:32 (GMT+00:00) To: neonixie-l
Subject: [neonixie-l] Re: Nixie Clock - Direct
Drive HV5530 I use that part for my NIXIE, Panaplex and LED displays and I also
write in assembly (8051, not PIC)For my code, I send the serial data for NEXT
time to display in the time
I use that part for my NIXIE, Panaplex and LED displays and I also write in
assembly (8051, not PIC)
For my code, I send the serial data for NEXT time to display in the time
after a 1 second update. On the 1 second "hack"
I update the display by doing the serial to parallel pulse.
Here is the
Thank you both.
Say that I want to drive high HVOUT12 on pin2 (that is binary b'0010')
of the HV5530... and reading your previous messages, do I simply...:
drive pin28 (CLOCK) low
drive pin31 (LE) low
drive pin28 (CLOCK) high
drive pin32 (DATA Input) low ; send 0 for bit 0 of b'0010'
Be sure to use a level translator to drive the 5530-type devices at the
proper signal voltages (12 VDC). Some people have driven them at 5V, which
is out-of-spec and not guaranteed to work. I use these drivers in some of
my clocks and they work very well.
Pardon my rant below, but I've been
Hi Max,
The HV5530 and other HV-Series IC's are "Serial to Paralell" converters
which allow to be control 32-pins (or even more with multiple ic's) from
single clock and data lines. They are basically normal serial to parallel
converters with high voltage transistors attached.
To operate
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