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SubZero fix - the new v12 fix on PCB by summ0ne
SubZero fix - the new v12 fix on PCB by summ0ne –
So for the last day ive been killing my mind how to combine the comsoft pic fix and mine on pcb and still make it fast + cheap enough for people to buy...
Then when i saw that you can mute the RS2004FS driver without using a PIC!!!
At first i thought to just drive the MUTE directly with the INT line of the mechacon - a 1 wire fix! CDs worked fine, but DVD media for some reason has such long interrupts that it mutes the RS so much, when there is not a mecha crash, the laser head starts oscillating...
So i somehow had to introduce the 50ms delay that the comsoft pic has to make DVD media read well
how does that work:
The cap is between any DC signal or GND and the INT line over a 1N4148 diode that can raise the voltage on the junction by charging/discharging the cap when the /INT is HIGH.
The voltage on the cap drves the /MUTE pin thru the 33k resistor.
When the /INT has a low pulse, the cap is not charged anymore, but discharges slowly thru the 33k resistor still not muting the RS, because the pulse is too short to let the cap discharge. And all media have the RS working well.
When there is a MECHACON CRASH, the cap discharges and mutes the RS within 50ms and leaves it mute.
You can test the mute function by disconnecting the /INT line from the circuit!
I WILL MAKE A QUICKSOLDER PCB soon and sell it on http://subzero-chip.com at a low price. It will have 4 solder points + 1 wire and require cutting 1 track. It will feature the fix just described + a +/-0.6V tracking limiter that will be auto-compatible with both the v12.1 and v12.2. It will NOT have a FOCUS limiter as the 4.7k resistor in my fix causes too many read problems + as the focus coil dies only in mecha crashes, the mute circuit will save it :-)
what do you guys think?
tests and comments are welcome within the next week, then i start PCB production
What are the advantages of doing this over your easier two resistor fix? I've been playing GT4 for hours on end over the last week and have no problems with the resistor fix.
no advantages at all.
but might help those rare people that have trouble with the focus resistor, and it mutes the RS2004FS for those that like that option in the comsoft fix.
Basically it increases media compatibility and you dont have to make a jumper for v12.1/v12.2
The tracking limiting is to the exact same extent as in summ0ne fix, but autodetects v12.1/v12.2. The focus is saved by the mute function as opposed by direct limiting, making it able to read more dynamically and read more media brands.
good idea but need more test,for different resistors(303 and 683) do you use same pcb?
Waoow you are think and post quickly,thanks Summone.
Originally Posted by summ0ne
but why not using the pic which can offer mucn more fanctionality.
anyway, when mechanics controll lock up will happen , the user will have to disconnect the pstwo from the power suplly bye hem self. so why not make it automaticly as my fix does?
u prooved u'r self as good electrition, but admit with the pic it's better
Hi somm0ne, could you pm prices for the subzero chip and this fix if ordered at the same time. (or would you include it for free?). 10 chips or less
pm me and i'll link u to a factory in china that will give u each pic for 0.8$. and also thay can program it for u.
Originally Posted by summ0ne
u can ask them for towsent preprogrammed pics.
subzero-fix pcbs in production, will be ready by the end of next week
-total Component cost: 4 cents
-minimum hassle install
-always on top of your ps2 protection needs
I will keep you posted