Les Railton's (Phipscube) Super A1200 Part 6

This project is so epic it will require a lot more posts and it isn't even finished yet :O

Here's an update on what i've been doing here I added a +5V wire to the Subway, this has helped with randomness at boot up (its soldered to "Pin 2") : -

I've made a little circuit that controls my top case fans. They aren't overly loud, but I thought it was unecessary for them to be running full pelt. This little board uses Pulse width modulation to keep the voltage level at 12V, but pulses slower of faster (adjustable with a pot), the effect of this is a quieter fan that moves more efficiently than simply dropping off the voltage. I made it based on this information: - http://www.overclockers.com/forums/s...67&postcount=2 Here's a pic!

Now the fans start up very quiet, once the BV heats up it drops the resistance on the thermistor hence the fans have quicker pulses sent to them to increase airflow. It still stays very quiet as this is the effect of PWM. The only downside of it is that when the room is very quiet you will notice a feint "ticking" noise. I'm currently planning to make a 5V version for the BPPC fan (I've also got a less noisy replacement fan on its way). I've added some jacks for Mic and Aux input to Delfina! :-

My clock port expander had been bugging me a little, I don't like the way it sits so rigidly, the slightest movement and it causes issues with the Subway and Delfina (probably more to do with the riser). I also wanted to try and figure a way to get some heatsinks on my BV RAM so.... I took off the connector: -

And replaced it with some old clock port cable (its short on purpose as the expander has to be as close as possible to the clock port): -

Thats the old connector with the riser needed to run it with a BV installed sat next to it. So now I can plug the Expander in like this: -

I'll find some nice 5mm Heatsinks for themz RAM chips now I've also added a +5V lead onto my Delfina, Since putting the BV in its been a bit touchy now and then on a cold boot (it doesn't initialise) Also sometimes on a soft reset: -

Here's the Fly lead connected: -

The pin needs to connect to the "top right" pin, or as I have done, soldered to the right side of the capacitor. This little lead has made my Delfina work perfect now! I think it just couldn't get enough juice through that CP expander sometimes. Here's my mixer solution: -

Quite a simple affair really. Just has 10K ohm resistance on each of the left and right from native and delfina outputs, then both channels are connected together after the Pots. All grounds are linked together and run along the back ready to mount to the internal sheilding of the A1200 (I used pots so I can change the volume levels and balance them off so both outputs are at similar levels if not the same, the native amiga is a little higher than Delfina you see). Underneath: -

Going into the A1200 now, i've added some wire loops that I will solder to the chassis :-

Resting loosely in place so I can test all is ok. It sits nicely

And if you look closely you can see its soldered to the metal sheilding now: -

It super solid, much better than my earlier hot glued cludge From the outside you'd never know any difference (well apart from that they are actually straighter than original, what is it with Commodore and its wonky phono plug placement!?)

That's it for this session, I hope you like these rather small mods All the exciting stuff is done now so it will be "finishing off" from now as she is just about done. I'm going to add some 3.5 mm jacks to the sides near the USB ports (If I can squeeze them in) for mic and line input to delfina, I may add a +5V line to Subway also just incase. I'll also add heatsinks to all 8 RAM chips on the BV and two on certain hotties on the BPPC. I'm also strongly considering dropping the 060 to 50MHz. I've got a decent Laser thermometer now that "Scans" and its just getting too hot for my liking. Otherwise i'll have to give in and add 4 big fat stupid rubber bungs underneath the old girl (I really don't want to though). Another option is 2x 6mm fans directly on the PPC and 060 but thats just more juice. We'll see, i'm pondering all that right now. The last thing i'll do is the 3.9 ROMS (Once I know everything else is working fine) Cheers!