Re: [neonixie-l] FS: Magnetic Reed Switches

[martin martin]

Those are great for clocks where you don’t want ugly buttons

On Sat, Jul 11, 2020 at 13:28 Jim KO5V  wrote:

> Hello,
>
> I have about 40ea, HSR-170 magnetic reed switches. Here is a link to the
> manufacturer's web page:
>
> https://www.hsisensing.com/product/hsr-170r/
>
> These are fairly large - the glass envelope is about 40mm long.
>
> If anyone can use some or all of them, make me an offer.
>
> Thanks. 73,
>
> Jim
>
>
>
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> .
>
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[neonixie-l] Re: What Type of Booster DC-DC is this one?

[Christian Riise Wagner]

I have to disagree with this being a flyback converter, as there is no 
transformer. It's simply a boost converter, albeit drawn in a quite confusing 
way. Although as gregebert said, it appears that the drain and source of the 
MOSFET (U1) have been reversed.

The output including the gate drive transistor looks very similar to what would 
be used together with the common MC34063 switching IC. Here, they're using a 
digital output from the microcontroller to provide the switching, albeit with 
no feedback as pointed out by gregebert.

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[neonixie-l] Re: What Type of Booster DC-DC is this one?

[gregebert]

Well, if the schematic symbol for U1 is correct, this will be a 
"catch-on-fire" inverter, because the internal diode of the MOSFET will 
create a complete circuit thru the battery and inductor, leading to high 
enough current to overheat the inductor or battery.


Sarcasm aside, I think the intent is for U1 to be a NMOS with the drain and 
source/substrate connections reversed. Then it becomes a flyback converter. 
It looks like Q1 is in the circuit to provide faster shutoff of U1. You 
would need to run some SPICE simulations to make sure it's working as 
expected, and you would need a good model for the PIC output, such as an 
IBIS model.

This circuit has no feedback loop, so the output voltage will vary wildly 
with load. Theoretically, the output voltage will be infinite with no load, 
and a minimum of around 3V out at maximum load (battery voltage minus 
diode-drop).

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[neonixie-l] FS: Magnetic Reed Switches

[Jim KO5V]

Hello,

I have about 40ea, HSR-170 magnetic reed switches. Here is a link to the 
manufacturer's web page: 

https://www.hsisensing.com/product/hsr-170r/

These are fairly large - the glass envelope is about 40mm long.

If anyone can use some or all of them, make me an offer. 

Thanks. 73,

Jim


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[neonixie-l] What Type of Booster DC-DC is this one?

[MrThe50sanchez]

Hello !

I was making a little bit of research and found this type of booster 
converter. 

What can you tell me about this one? I wan't to know how it works. 

I nearly understand how flyback boosters converters works and LT1308 
devices, but:

-Does here the mosfet make the switching mode for the inductor (wich makes 
the pick voltage) and the Capacitor stores the high voltage and them It 
supplies it to the nixie tube?
-What's the mission of the pic here?, It give`s an OUTPUT voltage when and 
fisical switch is press (when is added to the pic)?

Thanks a lot.

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Re: [neonixie-l] SLOT CLOCK...

[martin martin]

Here's one if anyone is interested...
https://www.ebay.com/itm/174273946237




~
*mcvei...@gmail.com *


On Wed, Jul 8, 2020 at 11:51 PM Dave ZL3FJ <2c...@silverbears.nz> wrote:

> Not being a gambler (and I tell lies!) it puts me in mind of the Telechron
> 8B01- from the 1930s….
>
>
>
> http://uv201.com/Clock_Pages/Telechron/telechron_minitmaster.htm
>
>
>
> DaveB, NZ
>
>
>
> *From:* neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] *On
> Behalf Of *Michail Wilson
> *Sent:* Thursday, July 09, 2020 17:19
> *To:* neonixie-l@googlegroups.com
> *Subject:* RE: [neonixie-l] SLOT CLOCK...
>
>
>
> That’s neat.  I’m going to have to build one.
>
>
>
> Reminds me of the pinball score reel clocks I’ve made.
>
> https://www.voltagegoat.com/product/pinball-clock/
>
>
>
> Michail Wilson
>
> 206-920-6312
>
>
>
> *From:* neonixie-l@googlegroups.com  *On
> Behalf Of *martin martin
> *Sent:* Wednesday, July 8, 2020 9:04 PM
> *To:* neonixie-l 
> *Subject:* [neonixie-l] SLOT CLOCK...
>
>
>
> Here's something different...
>
>
>
> https://hackaday.io/project/173510-the-time-bandit-clock
>
>
>
>
>
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> .
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> .
>

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