Anyone willing to help with an analog question? I am ok with digital, just
not analog.
I have a cart I made that allows me to download games to it so I can play on
the 2600. I am trying to add a cart reading function to it (you plug a cart
into my cart and you can dump it to pc). Which means I need to apply power to
the line that normally is the VCS power (I do not use VCS for power). My
logic is all handled in a CPLD XC95144 and I would like the power to be
applied when it says. Pins on it can only supply 24mA. I tried using a relay
with a switching transistor (something like this:
http://www.rentron.com/images/rely-drv.gif), but I cant get it to work right,
the relay oscillates on and off. I tried manipulating the bias resistor and
tweaking it other ways, but no go. So I am guessing that I need to to it
another way.
Can I use a MOSFET? If I do, is there going to be an issue when my cart is in
the VCS, there will be 5V applied to both sides of the MOSFET from separate
power sources. Is this a problem?
Thanks
Vern
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