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Author Topic: About Cheaplpc Output Voltage  (Read 80 times)

mr.x

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About Cheaplpc Output Voltage
« on: October 19, 2002, 10:31:00 AM »
I am using a 74HC14 in my cheapLPC, so no problem with that.
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supernatural

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About Cheaplpc Output Voltage
« Reply #1 on: October 19, 2002, 10:39:00 AM »
did you try my case (2) before? how about the output voltage without the SST chip onboard? want to know whether i got a bad 74HC14P chip.
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mr.x

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About Cheaplpc Output Voltage
« Reply #2 on: October 19, 2002, 06:12:00 PM »
QUOTE (supernatural @ Oct 19 2002, 04:39 PM)
did you try my case (2) before? how about the output voltage without the SST chip onboard? want to know whether i got a bad 74HC14P chip.

                                    I think it should be about 3.3V, but Im not sure, I can test tomorrow!
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supernatural

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About Cheaplpc Output Voltage
« Reply #3 on: October 20, 2002, 06:31:00 AM »
an idea, maybe it's due to the reason numbnut mentioned at the bottom of the CheapLPC page: some pcs will not work with the device.

maybe do what he suggested: add 4 x 1k resistors to pull up the four pins to 5V.

mr. x, feel free to tell me your result.
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mr.x

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About Cheaplpc Output Voltage
« Reply #4 on: October 20, 2002, 07:30:00 AM »
I get 4.4V when it is pluged to the LPT-port. I dont think you Pc is the problem. Have you tried the milk-debugger?
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supernatural

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About Cheaplpc Output Voltage
« Reply #5 on: October 20, 2002, 08:45:00 AM »
wink.gif

does anyone get the idea about my trouble CheapLPC...
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supernatural

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About Cheaplpc Output Voltage
« Reply #6 on: October 20, 2002, 11:28:00 AM »
does anyone use USB as power supply for CheapLPC and it works fine?
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mr.x

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About Cheaplpc Output Voltage
« Reply #7 on: October 20, 2002, 02:00:00 PM »
Try it on other PC's. If you cant get it to work, then it is probably something wrong with your programmer. It is probably nothing wrong with your USB either, just be sure you get 5V from it.
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GTac01

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About Cheaplpc Output Voltage
« Reply #8 on: October 20, 2002, 05:18:00 PM »
i got 1/4 470 ohm resistors, and im gonna use 2 AA batteries, anywthing wrong?
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gander

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About Cheaplpc Output Voltage
« Reply #9 on: October 21, 2002, 06:41:00 AM »
QUOTE (supernatural @ Oct 20 2002, 05:28 PM)
does anyone use USB as power supply for CheapLPC and it works fine?

                                    yep i do. Works fine on one machine - but not another! Go figure.
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supernatural

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About Cheaplpc Output Voltage
« Reply #10 on: October 21, 2002, 07:32:00 AM »
sad.gif  wink.gif  cool.gif  biggrin.gif  beerchug.gif
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