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Offline Homefire
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« Reply #11570 on: September 25, 2017, 09:42:32 am »
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  Lots of them !  Crazy eaa?   I put off building a serious Linear   Amp  because of the cost. 

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« Reply #11571 on: September 25, 2017, 02:41:37 pm »
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Quote:Posted by GoldDigger1950
Hey, Mud, what transistor costs that much?


That was a generic statement. I was thinking of the current 50V, high power mosfets in the 200-300 watt class at 30MHz. Of course the higher the frequency you go the prices does the same! The MRF150 is an N-Channel
Enhancement-Mode MOS BroadbandRF Power Transistor Designed for 2.0 to 150 MHz older though..... I see the VRF2933 - Transistor RF MOSFET N-CH 170V 40A 5-Pin Style M-177 - Microsemi being used in a parallel scheme for 1200 watts RF out. They are around $70.

What started this is the tuner I am debating upgrading has an input designed for PI output tube amps and the old tube PI circuits could work fine into various impedances at different frequencies. The tuner just has a fixed single coil input. To use the tuner with a solid state transmitter one would be better to redesign the tuner front end to match the somewhat ridged 50 ohm impedance.

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Offline GoldDigger1950
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« Reply #11572 on: September 26, 2017, 05:11:51 am »
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I was asking because I believed you were implying that some of the transistors used in metal detectors were that costly. My bad.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #11573 on: September 26, 2017, 06:12:33 pm »
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Hey. Maybe your on to something there GD, grin. Homefire, toss in a 200 Watt MOSFET ahead of the coil on your next project!  Wink

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« Reply #11574 on: September 26, 2017, 06:18:23 pm »
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  No Digging Required.  The Ground just melts away leaving the Target standing on a pillar of sand ?

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« Reply #11575 on: September 27, 2017, 03:11:03 pm »
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Quote:Posted by Mudflap
Hey. Maybe your on to something there GD, grin. Homefire, toss in a 200 Watt MOSFET ahead of the coil on your next project!  Wink

Quote:Posted by homefire
 No Digging Required.  The Ground just melts away leaving the Target standing on a pillar of sand ?

 Clapp Clapp you should apply for a patent before "someone" else doses

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The Diggers Oath
We swear by the Southern Cross to stand by each other and fight to defend our rights and liberties.
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« Reply #11576 on: September 27, 2017, 03:17:33 pm »
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   Imagine the battery for that puppy !   Shocked

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Offline GoldDigger1950
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« Reply #11577 on: September 27, 2017, 04:06:43 pm »
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We can use the flux capacitor from the DeLorean for power.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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« Reply #11578 on: September 27, 2017, 05:25:24 pm »
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   The Flux Inductor  has advantages over the Flux Capacitor.  You can use the Fly Back to extend battery life and when you get to your destination your still wearing clothes.   Grin

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« Reply #11579 on: September 27, 2017, 10:10:43 pm »
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You all can't tell me you never looked at a Playboy magazine....Playboy founder and legendary ladies’ man Hugh Hefner has died at the age of 91 Hugh Hefner, iconic founder of Playboy, has died at age 91 - CNBC.com



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57 mins ago - Hugh Hefner, the iconic founder of Playboy magazine, died at his home, the Playboy Mansion, of natural causes at age 91, Playboy Enterprises ...



























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Always set your detector knobs on high dedication, higher devotion and at the highest persistence
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