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Re: A scanner for you Zx81/Specturm.[WIP/DIY]
Posted: Mon Oct 16, 2023 12:42 pm
by XavSnap
For the AMSTRAD CPC 464/6128: (using a photodiode BWP 21 Telefunkel or a photoresistor = 2 colors)
http://abandon.pcbs.free.fr/mageco.htm
Re: A scanner for you Zx81/Specturm.[WIP/DIY]
Posted: Tue Oct 17, 2023 4:05 pm
by XavSnap
AMSTRAD CPC 464/6128 analog card:
GERBER/Kicad 6 project (
NOT TESTED):
http://abandon.pcbs.free.fr/mageco.htm
Re: A scanner for you Zx81/Specturm.[WIP/DIY]
Posted: Fri Oct 20, 2023 10:36 am
by XavSnap
ATARI ST Card (article's PCB):
Kicad v.6 & Gerber files:
Note:
In the article, the component's side in the top view is false.
The photo gave the right component side.
Re: A scanner for you Zx81/Specturm.[WIP/DIY]
Posted: Fri Oct 20, 2023 11:02 am
by XavSnap
The sound of a picture challenge:
Simply link the resistor output on a
cheap PC USB sound card (2$) to avoid burning the main inboard sound card...
The positive or negative low frequency signals can destroy the sound card !
The voltage had to be less than 5v to avoid to saturate the sound card recorder.
Don't bother the synchro connection.
Save your picture in WAV 16bits/44khz format, and post this zipped wav file on this tread/on a temporary host server.
Who will guess what the photo represents?
Re: A scanner for you Zx81/Specturm.[WIP/DIY]
Posted: Sat Oct 21, 2023 5:16 pm
by XavSnap
Motor speed:
Cylinder max speed turn around 1 rotation per second.
The speed variator can reduce this speed at -1/4= 0.75 rotation per second.
1RPS(Second) =60RPM(Minute)
Cylinder to the motor:
40touth/8tooth= 5 multiplier.
Motor to the cylinder:
8tooth/40touth= 0.2 multiplier.
60RPM x 5= 300 RPM
300 RPM x 0.2 =60 RPM= 1 RPS on the cylinder axe=1 RPS on the head moving axe.
Motor spec.: MOTOR DC 300RPM 3v. (1.5vx2 battery)
GA12-N20 DC 3V 6V 12V Micro Metal Gear Motor Gear Wheel Gear Motor 30RPM 50RPM 60RPM 100RPM 150RPM 200RPM 300RPM 600RPM 1000RPM
8 tooth gear hole 5mm with shaft key: (STL & Winds3D)