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Author Topic: Build Log for N gauge shuttle layout  (Read 659 times)

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Offline ronp849

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Re: Build Log for N gauge shuttle layout
« Reply #15 on: May 05, 2020, 12:16:48 PM »
plus as I'm an apple user little scope for computer control as most of this seems to be windows based.

However electronics wizardry is really interesting to me - so post away..

Cheers Derek

Hi Derek

The automation control on this project is done by the micro controller not a PC. When it is running in auto, I do not have a PC connected. There is hope for your system yet :thumbsup:

Electronics wizardry is like the Magic Circle wizardry - incredibly unbelievable until you are shown how it is done. :hmmm:

Offline ronp849

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Re: Build Log for N gauge shuttle layout
« Reply #16 on: May 07, 2020, 09:13:40 PM »
Hi All

This is the next installment of the build log. I have attached the PDF of the text and a PDF of the schematic. There are 3 pages to the schematic and 12 pages to the description.

There is a lot more to it this time so if anyone wants further details then post your questions on this thread and I or someone else will try to answer it.

Have fun

Ron

Oops! I forgot about the Glossary of terms - I need to put my thinking cap on again!!
« Last Edit: May 07, 2020, 09:16:30 PM by ronp849 »

Offline themadhippy

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Re: Build Log for N gauge shuttle layout
« Reply #17 on: May 07, 2020, 10:10:59 PM »
Motorised pots and filtered pwm signals to control an lm317 is so last year.The latest buzz is to use a digital pot controlled by the I2c bus,plus there dirt cheap at around 50p.
http://www.microchip.com/downloads/en/devicedoc/22147a.pdf
« Last Edit: May 07, 2020, 10:12:23 PM by themadhippy »
Don't fart before your arse is ready

Online Bealman

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Re: Build Log for N gauge shuttle layout
« Reply #18 on: May 07, 2020, 10:15:33 PM »
Now that's an interesting bit of kit! All 66 pages of it!!!

I was expecting a rotary encoder  :-[
Vision over visibility. Bono, U2.

Offline ronp849

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Re: Build Log for N gauge shuttle layout
« Reply #19 on: May 07, 2020, 10:54:05 PM »
Motorised pots and filtered pwm signals to control an lm317 is so last year.The latest buzz is to use a digital pot controlled by the I2c bus,plus there dirt cheap at around 50p.
http://www.microchip.com/downloads/en/devicedoc/22147a.pdf


Only a year old!!!  then it is ultra modern in my eyes. :laugh:

The problem with this device is it only gives 5v output at low current. (max 2.5mA) . The output of this would have to be boosted in voltage and current with something like an LM317 or a power opamp so I would be back where I started. The other point is the LM317 has S/C protection which was one of the reasons for using it.

Now if you want to be really antique then take the 555 timer - brilliant device in its day but that day was back in the last century, late 1970s to early 1980s. Some people still swear by them though.

I am likely to change the power control cct anyway. It is not a very elegant solution but it will do for the time being. I hope to introduce anti stiction pulses eventually but that is for future development.

regards

Ron

Online Bealman

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Re: Build Log for N gauge shuttle layout
« Reply #20 on: May 07, 2020, 10:59:01 PM »
Hey, I love the 555! My era, man!  :headbang: :headbang:
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Offline ronp849

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Re: Build Log for N gauge shuttle layout
« Reply #21 on: May 07, 2020, 11:20:53 PM »
Hey, I love the 555! My era, man!

I knew I would ruffle someones feathers. :)

Offline themadhippy

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Re: Build Log for N gauge shuttle layout
« Reply #22 on: May 07, 2020, 11:53:27 PM »
Quote
The problem with this device is it only gives 5v output at low current. (max 2.5mA) . The output of this would have to be boosted in voltage and current with something like an LM317
The digital pot replaces your filtered pwm transistor and 4049 so your control circuit becomes

Now the real challenge would be a triode doing the speed control :D
Quote
Now if you want to be really antique then take the 555 timer - brilliant device in its day but that day was back in the last century, late 1970s to early 1980s. Some people still swear by them though.
great little chip,still  gets plenty of use around here,however the yoof of today would rather spend 2 days writing some code to burn into a pic .

Don't fart before your arse is ready

Online Bealman

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Re: Build Log for N gauge shuttle layout
« Reply #23 on: May 07, 2020, 11:57:09 PM »
Ha ha! Probably true, though.... talk about reinventing the wheel!  :smiley-laughing:
Vision over visibility. Bono, U2.

Offline ronp849

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Re: Build Log for N gauge shuttle layout
« Reply #24 on: May 08, 2020, 12:27:21 AM »
The output from the digital pot will not go above 5volts. Therefore the output voltage  will only go up to 6.25 volts. (Voltage between pins 1 & 2 of the LM317 is constant at 1.25 volts.) I could achieve this directly with the PWM signal from the processor.

Ron

PS.A triode would certainly give the voltage range though. Power supplies might be a problem. Maybe use the digital pot for the heaters. 6.25 - 6.3 volts would be about right. :smiley-laughing:


Offline themadhippy

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Re: Build Log for N gauge shuttle layout
« Reply #25 on: May 08, 2020, 01:09:05 AM »
Quote
The output from the digital pot will not go above 5volts. Therefore the output voltage  will only go up to 6.25 volts
OOPs wrong device. maybe https://datasheets.maximintegrated.com/en/ds/DS3502.pdf   although thats only 15v,the one im thinking about was swinging between -24 to +24v
Don't fart before your arse is ready

Online Bealman

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Vision over visibility. Bono, U2.

Offline themadhippy

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Re: Build Log for N gauge shuttle layout
« Reply #27 on: May 08, 2020, 03:08:42 AM »
Want one,can even think of a use for it,but 50,maybe not.
Quote
  but it does glow cool blue!!
Just shove an RGB LED up the center hole of the valve base and you can have your valves any colour you want
Don't fart before your arse is ready

Online Bealman

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Re: Build Log for N gauge shuttle layout
« Reply #28 on: May 08, 2020, 03:15:06 AM »
The Aussie mag Silicon Chip has featured it in two projects to date: a pre-amp and a guitar effects pedal.
Vision over visibility. Bono, U2.

Offline themadhippy

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Re: Build Log for N gauge shuttle layout
« Reply #29 on: May 08, 2020, 03:34:14 AM »
Quote
and a guitar effects pedal.
exactly what i thought it was designed for,especial as its from korg,i was thinking distortion pedal.
Quote
a pre-amp
Bet there was a load of silicon either side of it.
Don't fart before your arse is ready

 

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