From: Daniel O'Shea (dan_at_ozramp.net.au)
Date: 2007-04-08 00:52:14
Jim Brain wrote:
> I'm not sure I can shed light on whether the ideas presented work, but I
> know I tried the transistor idea and some others when I was trying to
> emulate the paddle and had no luck.
Jim, are you certain about the transistor idea not working though? in
the old thread:
http://www.softwolves.pp.se/misc/arkiv/cbm-hackers/9/index.html#9813
...you say, "I did not try a current approach (Analog is my weak
subject), but wouldn't I need some sort of analog input to the
transistor in order to bias it to a certain level?" and then later: "I'd
travel down the path, but as of last night, the idea used by the
1351 designers and Hársfalvi noted in his project is working pretty
well"?
Pasi Ojala wrote:
> I am also no analog expert by any means, but it still seems
> to me that it would be possible to simply use a series resistor
> to convert the external voltage level into a current.
>
> When used "normally", the voltage is constant and the resistance
> changes, changing the current that charges the capacitor.
> If the voltage changes, but the resistance remains the same,
> the current that charges the capacitor changes. Both cases
> should seem about the same to the capacitor..
...so which is it to be then? a transistor, or a resistor? (isn't a
transistor a type of resistor anyway?)
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