Discussion in 'Sega Dreamcast Development and Research' started by Nopileus, Jul 19, 2015.
Thanks works great
Hi guys, randomly found this thread & wanted to share, how you can fake the fan pwm signal, without needing a single additional component! See my recent post on bitbuilt: https://bitbuilt.net/forums/index.php?threads/nolds-alternative-dreamcast-pinouts-workarounds.1822/
You really should disconnect pin 6 on IC601 first (or cut the trace) - with no trigger signal, the Q output will be driven low, and forcing current into the chip might eventually blow up the output driver. The chances of it subsequently catching fire are small, but it could happen.
I did some further research & found out the IC601 is sinking 26mA, which is 6mA above it's max. output sinking current. As you said, the chance is small, but I'll update my graphic with a trace cut!
Installed this one today, ordered the prints and cable from @Collingall, works beautifully. Thanks buddy!
Do you have to break the cable of an original fan to get the connector? or there is other way to get it.
@Collingall, links not working for me, what´s the price? I will not pay more than the price of a full console for a cable, i know retro is expensive, no 3d models? thanks anyway.
You can buy new connectors from digikey.
Preterminated wires: https://www.digikey.com/product-detail/en/6009458
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Weird it works for me. Anyway here are the Digikey part numbers
455-3082-ND preterminated wires
Fyi the wires have the pins terminated on both ends so you only need 2 wires for a single fan cable.
To build the cable yourself you would need the following
3 Pin housing $0.10 each
wire with pins $0.43 each x2
10K resistor $0.10 each
3 pin fan header $0.49 each
so $1.55 plus shipping their lowest priced shipping is $3.75 so you are looking at around $5.30 USD for one cable if you make it yourself that is also if you solder the wires to a pin header. I use nice receptacles in my cables but you can only really find those on Chinese websites like Aliexpress.
I do sell finished cables for $12 on ebay including US shipping or discounted international shipping. If anyone wants to buy one from me direct I will discount them to $10 just send me a dm and we can work out the details.
3D models are avalible in this thread or https://www.thingiverse.com/thing:2308549 I just posted brand new models that are stronger and easier to print on FDM printers.
anyone tried just replacing Dreamcast fan for a new one? In my console sits NMB 1204KL-01W-B49 5V 0.2A and suprisingly, I found plenty of them on Aliexpress. I couldn't resist from ordering one, however when it finally arrived, it turned out that my Dreamcast won't recognise the fan. Moreover, in feedback we can find somebody's review saying that it works with Dreamcast like a charm!
Here's the auction: click
just to verify, the latest v6 https://www.retrorgb.com/updated-dreamcast-noctua-fan-mod-design.html fits fine no need to trim the gdrom metal corner piece anymore?
Correct, you will need to snap off the support clip by the screw hole though. It is only needed for GDEMU installs since the GDROM drive will hold the fan in place when installed.
ok thanks for the clarification
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