@aga5897 10 ай бұрын
Superb idea ! ... apart from the noise. If the cooler+pump were in another room, Perfection !
@m1geo 6 ай бұрын
I was wondering about soldering to a water block. Googled it, and here we are!
@NeedleBender785 6 ай бұрын
Soldering is the way to go. Dont use thermal paste as it can be problematic. For both proper heat dissipation as well as conductivity since that is the Source connection for both mosfets.
@jasonfrye6473 Жыл бұрын
Very interested and looking forward to more videos on this type of amplifiers,.. thanks for sharing
@ericklein4282 7 ай бұрын
Please don't get me wrong., as your pallet is doing quite a good job at 1900w of PEP.! :) Though it would've also been great to see the actual AM, RF-envelope of a modulated test-tone on an O-scope... The main "quirk" I noticed was the extremely low dead-key / carrier output-power, versus the input power :( The NXP data sheet (especially for their 65v, 1800w device) states a CW (ie: dead-key) efficiency (at 27 Mhz) of 75%., and have seen videos of the NXP company demonstrating an efficiency of 80% operating at a 1 Kw CW / dead-key carrier. When watching your video (@ 7:58 time-stamp), your pallet was outputting an approximate 400w carrier, while pulling at least 1100w from the power supply (64v x 18a = 1150w) That's a CW efficiency of only about 36% (400 / 1100 = 36) or the inverse calculation of 1100w x 0.36 (36%) = 400., which is about the same as a class-AB biased BJT transistor (eg: 2SC-2879). About 2 years ago, I researched, designed and purchased all the electronics, internal-mechanics, housings, etc. to build my own dual-LDMOS amp (using the 65v, 1800w devices) but just finally found the time to start the project a few days ago. What I'm going with (in its design "architecture") is instead a CMCD (current-mode, class-D) design, which although is different from even the NXP "test-pallet". When a CMCD amplifier is designed correctly, and using proper value DC-power input chokes., can deliver even a bit greater amount of input to output efficiency., along with a 2-part, semi hybrid, dual-amplifier "combiner". Sooo., for all the $$$$ I invested in parts a few years back (over 2.5k.!)., I guess only time will tell if my completed "box" will operate properly., not only in its power-efficiency (and is why I'm using a custom, air-cooled heatsink and oversized heat-spreader, with very quiet fans), but more importantly., I'm hoping that its input to output linearity will display an almost perfect "trapezoid" pattern, for use with extra high-power, SSB operation..... Regards, Eric Klein Klein Communications (aka: KY8E)
@NeedleBender785 6 ай бұрын
Yeah that some very interesting stuff there. Would love to see other builders improve the design to get the efficiency up.
@ericklein4282 6 ай бұрын
@@NeedleBender785 Sure enough I'll bookmark your video here, and when I can (Lord willing) get my "box" completed, tested, and fully operational, I'll fill ya in on its test-results,. as I'm also incorporating a different type of "protection-circuit" that might be of interest to ya...
@NeedleBender785 6 ай бұрын
@@ericklein4282 This is all about learning for me. I wanna build the best HF amplifier with the most expensive and best parts money can buy. Cost is not a factor for me. I blew 12 of these mosfets just playing with them before I even thought about building that box. 73s
@user-vi6lw8dx5f Жыл бұрын
Great job Tony!!! Wr0546, Would you ever consider adding a couple of meters to your amps? Ty
@NeedleBender785 10 ай бұрын
Yes any meter you like. Mostly by means of a bird element
@gregrobey3639 Жыл бұрын
I love the water cooling system good job Tony from 132
@NeedleBender785 Жыл бұрын
Thanks!
@adonirom12 Жыл бұрын
Awesome Tony
@mrglabs4778 Жыл бұрын
Excellent idea! Any link to the water cooling part?
@NeedleBender785 Жыл бұрын
Thanks, I don’t have a specific brand or type that I use. I use mostly PC water cooling systems that I get on eBay. Lots of trial and error lots of different tubings and pipes to experiment with till you find something that works for you.
@mountainmansrevenge9295 9 ай бұрын
Are you selling this? If not would you mind telling me what pallet you used? Also is the water cooler plate custom?
@NeedleBender785 9 ай бұрын
My own pallet.
@mountainmansrevenge9295 9 ай бұрын
@@NeedleBender785 Do you plan to ell them? Mud Duck sharkey was selling a water cooled kit bit no longer :(
@NeedleBender785 9 ай бұрын
@@mountainmansrevenge9295 I have them for sale email me at xelectro@me.com
@peterdawson3536 Жыл бұрын
Quick question, do you think the cheaper computer water cooled CPU coolers would work or do you think you need something bigger?
@NeedleBender785 Жыл бұрын
Need something slightly bigger, has to be at least 50mm X 50mm square area and no less for the pill to sit on.
@peterdawson3536 Жыл бұрын
@@NeedleBender785 is it possible you could bolt one of these ready made coolers to a 50 mm plate. I have seen some that are $69 and have a radiator and 3 fans. While the CPU is less wattage, it's designed for prolonged constant use where as amps are not used for prolonged periods
@NeedleBender785 Жыл бұрын
@@peterdawson3536 I wouldn’t bolt these down as there is no heatsink compound capable of withstanding the heat. They have to be soldered. There are a few compounds but they degrade over time and I only recommend soldering. It’s actually pretty easy
@KN4YEM Жыл бұрын
@@NeedleBender785 Hi I just Subscribe👀
@GobblerK5_2WR080 Жыл бұрын
Lol...music players on the radio! 🤦♂ From watching your videos that water cooled box seems to be the ticket for long winded rag chewers and pushes the chip to its max!
@NeedleBender785 Жыл бұрын
Well you can do the same thing with a tube amp. I don’t encourage anyone to clog up the frequency by any means but I also don’t tell people how they should operate their transmitter.
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