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About 31336haxx0r

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    Electronics, physics, chemistry, cars and guess what: Ataris, too! :)
  1. Holy cow! I wanted to sell my Laser 500 in the mean time but didn't get around to it. Now I think, with all the stuff you guys figured out, I'll kepp that thing.
  2. It has a 7805 voltage regulator internally. so anything that puts out at least 7.5 Volts under 1 Amp load works fine as a PSU. Can't remember which terminal of the jack was positive and negative.
  3. 31336haxx0r

    sio me 7800

    You'd just need some sort of loader cartridge that gets the data from the SD card, stores them in its internal RAM and then switches over. It would have been more elegant to have this feature implemented directly into the XM's CPLD. But I think Curt is lucky when those things are shipped and he doesn't have to add anything new...
  4. Nope, those N64 sticks appear to work like an optical computer mouse.
  5. PAL & NTSC TIAs are indeed different. I have a spare PAL TIA around, if you need one.
  6. How much? And how much is shipping to Germany? Well, IF you ship outside the US.
  7. It may be for those General Electric thermotransfer printers. I'm not sure, though.
  8. If I remember this right, then there is an adjustable coil in the RF modulator part of the PCB. You could try adjusting that. Edit: did you try out the TIA chip of that console in a different, known working console?
  9. The voltages measure fine and everything stays cool on that PSU. Just the caps oh the secondary side get hot. For whatever reason.
  10. BTW, what's the culprit when the capacitors on the low voltage side of the PSU get hot? I have replaced them with new low ESR ones and even those still warm up dramatically.
  11. They are somewhat different. The shorter thingy seems like it doesn't have the cooling vents above the cart slot.
  12. BA-DUM! I have an idea!! The 10K pot controls the pulse width of an oscillator that in turn turns the LED on and off. Either dark, or full brightness, nothing in between. This light shines on the LDR which has a capacitor in parallel to it to smooth out the PWM signal. You'd want a small capacitor to still be able to achieve fast transients of movement. TAU [the greek letter] =R*C, R is 1M Ohm at max so you go from there and calculate the minimum frequency of the oscillator to achieve a full swing of the movement extremes in a given time. Let's assume you move the stick left-right-left-right-.... 10 times a second. You nee approximately 5 TAU to fully charge or discharge the capacitor. 5*TAU=1/10 = 0.1 seconds -> TAU=0.02 seconds. C=TAU/R = 0.02µF= 20 nF. According to Nyquist's theorem, we need to sample at least twice the amount of the frequency we want to measure, so T=0.02/2=0.01 sec. With the frequency f=1/T we get 100 Hz for the oscillator's frequency. Now here comes the electrically easy part You could just have the LED shine through a piece of plastic with varying opacity fixed to the stick. As the stick gets moved around, so does the plastic piece, resulting in different amounts of light on the LDR. Such a piece of plastic can be made by printing a dithering on it. That thing needs NO CLEANING EVER but is probably not that easy to build.
  13. One could control an LED with the 10K pot and have that LED in turn illuminate a light dependent resistor with the correct specs.
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