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3D Printed mini arduino 32 line Mechanical Television

PostPosted: Sun Apr 12, 2020 7:12 pm
by Erwin
Fig 3.png
Fig 3.png (712.18 KiB) Viewed 4108 times

Mijn TV Schema.png

DSC01989.JPG


I am building a mini arduino mechanical television ( 4 parts 3D printing )
I would use such a schema (see fig) but don't find the mosfets
Now my question is I can use a BD139 or BS170
I don't use the Mextion Display and the Pam8302 amplifier and sd card reader if is possible
I do own the 3 NBTV floppy disks I would like to use
I have seen such a project on the forum but the schematic and arduino source code was not found (or I have not looked closely)
i am a builder but bad programmer ( a copy builder )
Who can help me please

Kind Regards
erwin.meyvaert@telenet.be ( old ex memberlid in retired 66j )

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Mon Apr 13, 2020 1:06 pm
by Steve Anderson
I'm surprised you're having trouble finding IRF540s MOSFETs, they're very common amongst component suppliers...if that's the device you mean. It's the only one I can see in the schematic.

You can't use a BD139 as it's a bipolar (junction) transistor, and although the BS170 is a MOSFET, it can't handle the power.

There are many you can substitute for the IRF540, who is your usual supplier and I'll see what they have.

Farnell/Element 14, Belgium, have them in stock at Euro 1.01+VAT for 1-off quantities. (No Euro key on this PC, or GBP (UK pound) either).

https://be.farnell.com/infineon/irf540n ... w%2Fsearch

Steve A.

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Mon Apr 13, 2020 3:12 pm
by smeezekitty
Steve Anderson wrote:
You can't use a BD139 as it's a bipolar (junction) transistor, and although the BS170 is a MOSFET, it can't handle the power.



You likely could substitute a BJT here because its only driving a motor. Worst case you have to add a second transistor to drive the base if the Arduino can't provide enough base current.

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Mon Apr 13, 2020 6:33 pm
by Erwin
DSC01991.JPG
This is my latest mini version (I love drawing and building) derived from the following site https://www.instructables.com/id/A-cardboard-televisor/


Thank you for responding
Sorry I'm wrong formulated I do not find IRF540 in " my junk box "
I fond a IRF 530 in the locale shop , is that oke
Do you know anything about the schema and arduino source code of the project from the picture fig3

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Mon Apr 13, 2020 9:02 pm
by Steve Anderson
The IRF530 handles less current, but it should be more than enough for what looks like a small DC motor.

It's switched/pulsed/PWM so it shouldn't need a heatsink, but have one handy just in case.

I don't code in Arduino so I can't help there - others may be able to.

I hate these sort of schematics, 'drawn' by people who 1) don't know how to draw, 2) are lazy, 3) don't provide much useful information at all 4) are a pain to comprehend 5) and usually contain far too many errors.

Steve A.

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Mon Apr 13, 2020 9:14 pm
by Erwin
Sorry for asking again but I have fond a irf 510 is that better???????

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Mon Apr 13, 2020 9:24 pm
by Steve Anderson
An IRF510 handles even less current, but still up to 5.6A. I suggest adding a heatsink at first, and see how warm it gets. If it runs nice and cold you may be able to remove it. But check the temperature of the IRF510 without a heatsink and if it burns your fingers - put the heatsink back!

Steve A.

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Fri Aug 07, 2020 12:37 am
by FlyMario
Well that is very cute and cool! Do you have a youtube channel that we can see this in action?

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Mon Nov 02, 2020 3:38 am
by Markd
That is a really good setup. I am new to NBTV and enjoy seeing just what can be made by other members.

Re: 3D Printed mini arduino 32 line Mechanical Television

PostPosted: Tue Dec 01, 2020 3:09 am
by Erwin
I'm still building, it's on the back burner