Passive Heatsinking Only - Comments

[Anthony]

You can also use bigger fans at lower speeds if you don't like the wining sounds of fans.

A big fan at low speed produces almost no noise, and the noise is lower pitched so less irritating.

[frank_1257]

That could work nicely I am looking at using water cold plates a small, co2 laser water pump and a row of 72 watt melcor water heat exchangers on exterior

Hi

I'm currently working on the details of a complete projector rebuild. In my current projector I have a single layer design 10mm aluminuium baseplate and use a couple of fans to create airflow to keep the electronics cool. In the new projector i'm going to move to a dual layer design with a sealed optics compartment.

Also, i've recently accquired a set of CT6215's with the 671 drivers (60k) , I believe these can get quite warm when driven hard. I will also be adding a 635nm Red to my existing dual Maxyz setup using the group buy dichro. I have a 300mW laserwave green (constantly outputting just a tad under 500mW ) and a Lasever 200mW blue (outputting a nice steady 212mW). I also have plans to add some 445nm blue in there but that depends on funds

In my rebuild I want to avoid the use of fans altogether and have been looking at this...

http://www.birminghamaluminium.com/heatsink_detail/83

I reckon there should be enough surface area on this stuff to dissipate any residual heat by convection alone, i'll put case vents in the bottom and top/back of the projector. It should also be nice and stable.

What do you folks think?

Cheers

Jem

[Things]

Any temperature controlled relay type thing should work, just make sure it has variable temp. limit control, you dont want your projector reaching 50C before the fans come on

[FourDee]

I'm still looking for a simple IC with temperature sensor input (to connect NTC) and with an input for the temperature-setpoint (to connect variable resistor) and a switch output to switch on/off a fan via transistor/thrysistor.. Would be a nice solution.

Then I have just the thing for you!
The Microchip TC620/621
The 620 has a built in temperature sensor while the 621 connects to an external NTC sensor.

They are simple 8-pin DIP IC's that have outputs for if a MAX temp is exceeded and one if a MIN temp is reached.

You can sample these for free from microchip.

[JeroenVDV]

Then I have just the thing for you!
The Microchip TC620/621
The 620 has a built in temperature sensor while the 621 connects to an external NTC sensor.

They are simple 8-pin DIP IC's that have outputs for if a MAX temp is exceeded and one if a MIN temp is reached.

You can sample these for free from microchip.

Man... I've been searching for ages for an IC like that! Great, thanks!

Now I just have to find out how to design a PCB.. Working on it!

[Jem]

Now I just have to find out how to design a PCB.. Working on it!

Hmmm... When you've designed the PCB and have a working model you could perhaps consider building a few more units to sell on here, I happen to know one customer who'll probably be interested

Jem

[JeroenVDV]

I'm working at a software company which also designs USB>DMX hardware and other electronics.. So no problem to get some help here

[Jem]

I'm working at a software company which also designs USB>DMX hardware and other electronics.. So no problem to get some help here

Well... It looks very pretty

Just need someone to build it now

[JeroenVDV]

Well... It looks very pretty

It's a screendump from the TC621 datasheet...

Just need someone to build it now

I'm currently working on some PCB-designs for the laserprojectors we're building here (connector-PCB's with Ethercon for ILDA in/out and on the inside PCB-headerconnectors for connection to the lasers/scanners/etc). The only problem is that a day only has 24 hours...

[Jem]

The only problem is that a day only has 24 hours...

You mean you suffer from that problem as well

I don't know about you, but I find that work really interferes with playing time

Thanks for your help.

Jem