Re: [neonixie-l] Re: IN-18 Blue Dream PWB

[Dekatron42]

Thanks for the link on the TI document.

I agree that in this particular circumstance it is probably not a latchup 
condition.

In one specific case I came across recently I never dug deep enough to 
check if it was a proper latchup or not but it certainly looked like it as 
it pulled the 5V line low. The case was with a TI PCF8574 which was hooked 
up to the same 5V line as a PIC processor, the PIC processor started to 
communicate with the PCF8574 on the I2C bus at some 1.8V and then the TI 
PCF8574 went bonkers, pulling the 5V line to some 2.5V. If I replaced the 
TI part with an NXP PCF8574 everything was just fine (the design had used 
the NXP parts for many years without a problem but as soon as the TI parts 
were used the problem started to pop up intermittently). It was also fine 
if I let the processor wait until the voltage had reached some 4.85V with a 
POR ic. I didn't dig further into problem after I added the POR ic to the 
circuit. Instead of using the TI PCF8574s I made SOIC to DIP adapters and 
continued to use the NXP PCF8574, but I still use the POR ic as a 
precaution if NXP change their design in the future and also as a good 
measure.

/Martin

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[neonixie-l] OT: Vacuum Tube Projects?

[SWISSNIXIE - Jonathan F.]

Hello Folks,

Being relatively young, i clearly missed the vacuum tube age by a lot of 
years :-) Still vacuum tubes and especially nixies became my hobby and i'm 
very interested in them. 

The internet is full of audio vacuum tube projects like amplifiers. But i 
don't want to do audio projects for a buch of different reasons. But i 
really would like to do a project with vacuum tubes (other than nixies..) 
that is usesfull to, and shows the beauty of these devices. 
The only audio device i would build is a radio, but since AM/FM gets less 
supported i don't know if its a good idea. 

Can anyone here make suggestions what useful* project could be made with 
vacuum tubes other than an amplifier?

Thanks for your suggestions



* by useful i mean something you could use for a purpose and not just a 
construction to decorate a shelf.

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[neonixie-l] Re: OT: Vacuum Tube Projects?

[J Forbes]

Television sets were a major use of vacuum tubes from the late 1940s till 
the mid 1970s. They are quite tricky to build, but I've found several old 
ones to play with, over the years. 

Old tube based test equipment is also interesting, I even made a sort of 
functional clock using an old counter. 

https://www.youtube.com/watch?v=VM9TW6GcCQE

I have an tube based Tek scope from the early 60s that I can use to keep my 
shop warm, since it dissipates about 500 watts just sitting there!

Short wave radio also used tubes, I have a BC-348/Q radio receiver in my 
office, so I can tune in WWV.

On Saturday, December 30, 2017 at 6:05:14 AM UTC-7, SWISSNIXIE - Jonathan 
F. wrote:
>
>
> Can anyone here make suggestions what useful* project could be made with 
> vacuum tubes other than an amplifier?
>
>

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Re: [neonixie-l] OT: Vacuum Tube Projects?

[Dan Harboe Burer]

Useful vacuum tube based instruments could be e.g. a regulated power
supply, with various outputs, for tube experiments, an electrometer..a
voltmeter.. a Geiger counter with a photomultiplier tube, maybe? :) ..a
Theremin.. or what about something as crazy as a stroboscope tachometer? :)

Dan

On Sat, Dec 30, 2017 at 2:05 PM, SWISSNIXIE - Jonathan F. <
jfrech...@gmail.com> wrote:

> Hello Folks,
>
> Being relatively young, i clearly missed the vacuum tube age by a lot of
> years :-) Still vacuum tubes and especially nixies became my hobby and i'm
> very interested in them.
>
> The internet is full of audio vacuum tube projects like amplifiers. But i
> don't want to do audio projects for a buch of different reasons. But i
> really would like to do a project with vacuum tubes (other than nixies..)
> that is usesfull to, and shows the beauty of these devices.
> The only audio device i would build is a radio, but since AM/FM gets less
> supported i don't know if its a good idea.
>
> Can anyone here make suggestions what useful* project could be made with
> vacuum tubes other than an amplifier?
>
> Thanks for your suggestions
>
>
>
> * by useful i mean something you could use for a purpose and not just a
> construction to decorate a shelf.
>
> --
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> msgid/neonixie-l/f25ba86e-66d8-4d75-a350-05933c742839%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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[neonixie-l] Re: OT: Vacuum Tube Projects?

[Terry S]

Radio is far from dead

Here's one of my vacuum tube projects Restoration of a Drug Store tube 
tester. The full story can be read over at rec.antiques.radio+phono

https://www.flickr.com/photos/32165280@N02/sets/72157674341385913/with/9325619978/

It's an emissions-only tester, so only marginally useful, but fun and cool. 
And if you want to play with tubes you may want a tube tester.

Terry

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[neonixie-l] Re: One Tube Nimo Clock

['threeneurons' via neonixie-l]

On Thursday, December 28, 2017 at 3:45:19 AM UTC-8, Dekatron42 wrote:
>
>
> Will this circuit work just as well with the Telefunken XM1000?
>
> /Martin
>

 Mostly, yes, with minor adjustments. Those being different basing and 
pinout. 1.5V, 120mA (XM1000) heater versus 1.1V, 200mA (Nimo) heater. 

Bigger issue is getting your hands on either type tube. These are very rare 
tubes. 

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[neonixie-l] Re: OT: Vacuum Tube Projects?

['threeneurons' via neonixie-l]

> * by useful i mean something you could use for a purpose and not just a 
> construction to decorate a shelf.
>

You mean functioning ?  I have a tube project, in the queue, that's visual, 
so its decorative, yet the tubes are functioning as designed. Its a tube 
color organ.

I've been bothered about the old SCR based color organ circuit that's been 
floating around since the 60's. It has NO true amplitude-to-phase-angle 
control. I actually make a TRIAC kit, that does the job properly, and I 
plan to make a tube version shortly. It will be using both vacuum tubes, 
and thyratrons.

Here's a timing diagram showing true phase control for TRIACs:



It will utilize single vacuum triode stages as voltage comparators, much 
like I'm doing here, with a transistor:



And here's an old tube color organ kit, that does NOT have decent phase 
control, even though the author believes it does, and is probably the bad 
example that continued over to solid state SCRs:

https://threeneurons.files.wordpress.com/2017/11/radio-news_color-organ.pdf



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