To overclock the DC you'll need:
- A 4pin oscilator (40 MHz works fine)
- Wires
- Soldering iron + solder
- Swith if you want to make it switchable between OC'ed and non-OC'ed
- Talent
- Steady hand
-Maybe a better fan/colling system
And a ~7.2 Oscillator if you want to sync a vmu with
the 240MHz dc
So look for it on ebay (steady hand cannot be bought)
Took pics and made an OC diagram
- FamilyGuy
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Hi there, I was wondering is there a any point on the board where you can get a 40mhz signal or can you only get it from an external oscilator, Basicaly can you get 240 or under using the DC alone. If not can anyone tell me the part number needed or point me in the right direction, i did try jameco but had no luck. Thanks all.
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those look like crystals, according to my electronics class, a quartz crystal has cuts in it from a laser encased in a metal "can". Using some components such as an operational amplifier (not typically used for frequencies above a few MHz, high speed CMOS IC's seem to work well for high frequencies) or transistors and capacitors to meet the Barkhausen criteria for oscillation:
B*A is slightly greater than 1
where A is the amplification gain (typically -1) and B is created from the capacitors to produce a phase change of 180 degrees (same as a gain of -1) hence -1*-1 = 1 (the product should be slightly larger than 1, which the causes the cut crystal to oscillate at it's resonant frequency. This type of oscillation is typically called "Pierce Oscillator". The quartz crystal will tend to oscillate at its resonant frequency as long as B*A is in a certain range.
since crystals can be difficult for for some, oscillators were made with the circuitry inside the metal can/casing eliminating the need for building a proper circuit to oscillate the crystal only needing to apply a voltage (usually 5V or so).
I'd recommend using regular 4 pin oscillators unless you have a decent amount of circuitry skills so you don't have to deal with those issues. (although crystals tend to be cheaper).
I purchased a bunch of 45MHz 4 pin oscillators recently which I'll be receiving soon, anybody tried overclocking with this frequency?
B*A is slightly greater than 1
where A is the amplification gain (typically -1) and B is created from the capacitors to produce a phase change of 180 degrees (same as a gain of -1) hence -1*-1 = 1 (the product should be slightly larger than 1, which the causes the cut crystal to oscillate at it's resonant frequency. This type of oscillation is typically called "Pierce Oscillator". The quartz crystal will tend to oscillate at its resonant frequency as long as B*A is in a certain range.
since crystals can be difficult for for some, oscillators were made with the circuitry inside the metal can/casing eliminating the need for building a proper circuit to oscillate the crystal only needing to apply a voltage (usually 5V or so).
I'd recommend using regular 4 pin oscillators unless you have a decent amount of circuitry skills so you don't have to deal with those issues. (although crystals tend to be cheaper).
I purchased a bunch of 45MHz 4 pin oscillators recently which I'll be receiving soon, anybody tried overclocking with this frequency?
- Morphv2
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Re: Took pics and made an OC diagram
I have. But, unless you to what I did (usd direct Nexus -> PC saving), or one o' them VMU mods, save corruption thresholds become unacceptable.