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Offline golddustcarlTopic starter
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« on: October 14, 2015, 11:36:26 pm »
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All,

A new technology mosfet transistor is now available for PI detectors. 1700 volts 8 amps. It is the Silicon Carbide Transistor from GeneSic. Off resistance 500 megohms. Here is a link. Come back and give me your thoughts before I try one.

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http://www.digikey.com/en/product-highlight/g/genesic-semi/silicon-carbide-transistor?WT.v_sub=6574091&WT.mc_id=em_TNL1510A.US.Send&WT.z_email=4144_TNL1510AI0US_product2learnmore--1242-GeneSic&mkt_tok=3RkMMJWWfF9wsRoiuqjNZKXonjHpfsX56%252B4lXq%252B3lMI%252F0ER3fOvrPUfGjI4FTMNmI%252BSLDwEYGJlv6SgFS7TBMa5j2LgNWBE%253D.


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Posted on: October 14, 2015, 10:05:51 pm
Just noticed something on the datasheet that troubles me a little. The CISS is a little to high maybe. This causes rise and fall times at the input to affect the switching time a tad too much I think. The IRF610 has a much lower CISS (140 pf). Still, the device allows higher spike which translates into a stronger signal at the coil. Am I thinking wrong on this?

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A bad day at gold prospecting or metal detecting is better than a good day at work.

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« Reply #1 on: October 14, 2015, 11:48:13 pm »
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Is that 250 Milli Ohms ?

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Offline golddustcarlTopic starter
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« Reply #2 on: October 15, 2015, 12:03:00 am »
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Quote:Posted by homefire
Is that 250 Milli Ohms ?


Megohms......off resistance

Dusty Carl

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Marked as best answer by golddustcarl October 14, 2015, 06:08:43 pm
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« Reply #3 on: October 15, 2015, 01:36:16 am »
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The typical switching time is 23ns which is not going to be affected in the ranges we use. The fastest switching time in a typical metal detector is in the microsecond range and that is at 330khz. What troubles me is the price of nearly $60 per transistor. No room for a mistake there. You fry one in the design stages and you are basically out of business unless you can afford to buy a tube of them.

There are other MOSFETs that will do the job for our frequency range. This one seems to be for very high switching frequencies. Personally, I'd wait for the price drop. New silicon typically drops drastically after introduction.

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« Reply #4 on: October 15, 2015, 02:11:16 am »
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I think you hit the nail on the head GD.

Dusty Carl

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« Reply #5 on: October 15, 2015, 05:26:01 am »
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senseless to power up the transmitt power without better filters at the Input stage

for example to get 10% more depth you have to double the power
and if you double the power you will have a lot more falsing which results in decreasing the gain
and at the ende you have 5% more depth and you have to carry bigger batteries Huh?

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my machines at work http://mueller-meteoriten.de

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« Reply #6 on: October 15, 2015, 09:02:30 am »
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Quote:Posted by bernte_one
senseless to power up the transmitt power without better filters at the Input stage

for example to get 10% more depth you have to double the power
and if you double the power you will have a lot more falsing which results in decreasing the gain
and at the ende you have 5% more depth and you have to carry bigger batteries Huh?


Another good point. Thank you.

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« Reply #7 on: December 20, 2015, 11:42:26 am »
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Hello !!! i'm not great electronicien but i just wanna know : have you never try to put a switch power supply into the P.I instead a classic battery ?
i think if it does match , it will be more powerfull if it is no interference ,isnt it ?

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« Reply #8 on: December 20, 2015, 09:30:29 pm »
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Quote:Posted by AK48
Hello !!! i'm not great electronicien but i just wanna know : have you never try to put a switch power supply into the P.I instead a classic battery ?
i think if it does match , it will be more powerfull if it is no interference ,isnt it ?


What do you plan to run the switch mode power supply with? Uranium? Of coarse not. You still need batteries.

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« Reply #9 on: December 21, 2015, 10:52:50 am »
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   Switching Power supplies tend to produce a lot of EMI like anything using square waves.

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