Quote from: MrKaizerSoze on November 11, 2016, 04:17:11 PM

Quote from: andymanone on November 02, 2016, 09:17:09 PM

Quote from: MrKaizerSoze on November 02, 2016, 05:38:16 PM

Maybe somebody did it, but I couldn't find any reply about it: Someone tried to use a big-ass heatsink with peltier cells? I want to know if we can set more than 500 Mhz per USB stick and how.

Hi MrKaizerSoze, that was me Wink

.

I´ve used a big hookup cooler and made also a couple of experiments with peltier modules..

Finally I pushed it up to 450MHz and it works stable!

(Higher is possible, (475MHz works Cool

!) but not long time stable.)

https://bitcointalk.org/index.php?topic=1173963.msg14928411#msg14928411

But therfore you have to modify the vcore pot (standard version is limited by 0.8V max), to increase the vcore up to 0.9V (900mV) and higher..
...
Cheers,
andY

First, sorry for my bad english, is not my native language.

Thanks brother, but I can't see the peltier cell installed, can you please explain me how are you using it?

How did you increased the vcore voltage more than 0.8V? BTW, I saw the capacitor (I think is a 16000 uF, but I'm not sure)

Have you tried to set the frequency more than 500 MHz?

The piece you're using to fit the heatsink is pretty clever, what is it name and where can I find it?

Can you provide the noise level of the fan?

How long is the USB cable? Have you tried with a shorter one?

Hi MrKaizerSoze,
sorry for late response! Very busy last time... Sad

@your english: never mind about that, ya are welcome mate Wink

, it´s also NOT my native language Wink

.

But back to the topic

:

@Peltier:
here you can see my peltier element (the white square with red and black wire))
I´ve used it primary with my Antrouter R1 (same ASIC)

To reach the expected cooling effect (down to freeze temp), it´s nessessary, that you use a proper cooling at the other side of the peltier (because its driving very hot, w/o a cooler)

Here you can see some tests:

The green Controller board youl´ll see in front regulates the peltier (depend of the temperature):

Here a closer view, there you´ll see the peltier working between Air-Cooler and the "Cooling side":

(The procedure to use it with a gekko is nearly the same

)

@your other questions:

Quote from: MrKaizerSoze

How did you increased the vcore voltage more than 0.8V? BTW, I saw the capacitor (I think is a 16000 uF, but I'm not sure)

the Vcore value is limited by the board design.
(If you want to increase the Vcore you have to remove and replace a resistor there.)

Whats to do:
The onboard 10k pot goes from ground in chain with a ~10k resistor to the TPS51219 voltage regulator.
all what you have to do is to remove the 10k res (seen on my pic below) and replace it with a 17k or 20k resistor

Finally it looks so:

Btw, Its very useful to put a Cooler on the backside from the TPS51219 voltage regulator (seen on the picture), because it´s running hot too.

Quote from: MrKaizerSoze

Have you tried to set the frequency more than 500 MHz?

I tried it, but it fails.
The Problem is the "Max Current" limit of the TPS51219 voltage regulator.
It provides not enough power resources.

Quote from: MrKaizerSoze

The piece you're using to fit the heatsink is pretty clever, what is it name and where can I find it?

It s a Silent Shark "HPD-815" from Evercool (dual copper/aluminium) with a fan "inside".
You´ll find it here:
http://www.evercool.com.tw/products/hpd-815.htm

Quote from: MrKaizerSoze

Can you provide the noise level of the fan?

Don´t know the accurate noise level, but its very moderate, usable in your living room.

Quote from: MrKaizerSoze

How long is the USB cable? Have you tried with a shorter one?

I´ve used my so called "Direct Injection"

, that means, the Gekko got it´s power via direct on board soldered power connector (not via USB)
so the lenght of the USB cable is of second rank, but I used a 0,5m.

But for the perfect cable you´ll find lots of good suggestions from other members of this forum (preferred 0,3 meters short USB 3.0 cables)

So, thats for it, I think.

If any question, feel free to ask me.

Cheers,
andY