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1. [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 09:07:14 -0700; I'm thinking of building a solid state 1500 watt amp using some of MicroSemi's high voltage MOSFETs. This is a new kind of project for me and I would appreciate any comments you might have which woul; /archives//html/Amps/2013-06/msg00046.html (8,197 bytes)
2. Re: [Amps] Advice needed for SS amp (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Wed, 05 Jun 2013 09:58:11 -0700; Well, if nothing else, this project proves that you have guts (I used a different word, but remembered that this list is moderated)! Why such a large capacitor for the power supply? Surely 680 uf, on; /archives//html/Amps/2013-06/msg00047.html (10,139 bytes)
3. Re: [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 10:35:31 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: Did you mean S1D2 instead of S1D1? I don't think you can do what you ask because I think that S1D2 & S3D4 are where you take the output from, i.e. where the; /archives//html/Amps/2013-06/msg00049.html (7,190 bytes)
4. Re: [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 12:44:37 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: Why such a large capacitor? 6800 uF with an eight amp drain gives about a 1.5 % ripple. 680 uF would be ten times more and I think that's too much. By compar; /archives//html/Amps/2013-06/msg00051.html (8,328 bytes)
5. Re: [Amps] Advice needed for SS amp (score: 1): Author: donroden@hiwaay.net; Date: Wed, 05 Jun 2013 18:38:37 -0500; I'm thinking of water cooling. I'm thinking of running a full wave bridge rectifier directly off the 240 VAC line, thus eliminating the power transformer and giving about 340 VDC no-load. Sounds like; /archives//html/Amps/2013-06/msg00053.html (7,458 bytes)
6. Re: [Amps] Advice needed for SS amp (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Wed, 05 Jun 2013 20:09:34 -0400; Sounds like what the State of Alabama uses to dispatch hardened criminals..... Water cooling is nice, but you are probably going to need either DI or distilled water at those voltages and water cooli; /archives//html/Amps/2013-06/msg00055.html (9,006 bytes)
7. Re: [Amps] Advice needed for SS amp (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 6 Jun 2013 00:44:23 +0000 (UTC); Hi Bill, I had an amp using the MRF1500 parts, based on the commercial Tokyo high power design. I also talked to the THP guys for a while at Dayton and they are phasing out their ARF1500 design using; /archives//html/Amps/2013-06/msg00056.html (10,025 bytes)
8. Re: [Amps] Advice needed for SS amp (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Wed, 5 Jun 2013 19:42:37 -0600; Seems to me the 50V limit would be a deal breaker. I love the idea of a transformerless design. I wonder if the THP problems were really the devices, as opposed to a design glitch they never figured; /archives//html/Amps/2013-06/msg00058.html (11,377 bytes)
9. Re: [Amps] Advice needed for SS amp (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 6 Jun 2013 02:22:02 +0000 (UTC); You might want to take a look at JE1BLI and JA1DJW article from September 2006 QEX http://www.mods-ham.com/03_Home-brew/Homebrew-Mods/ARF1500-PA/qx9ohsawa.pdf -- Original Message -- From: MU 4CX250B; /archives//html/Amps/2013-06/msg00061.html (11,640 bytes)
10. Re: [Amps] Advice needed for SS amp (score: 1): Author: donroden@hiwaay.net; Date: Wed, 05 Jun 2013 22:05:57 -0500; Seems to me the 50V limit would be a deal breaker. I love the idea of a transformerless design. I wonder if the THP problems were really the devices, as opposed to a design glitch they never figured; /archives//html/Amps/2013-06/msg00064.html (9,043 bytes)
11. Re: [Amps] Advice needed for SS amp (score: 1): Author: donroden@hiwaay.net; Date: Wed, 05 Jun 2013 22:41:19 -0500; Someone back in the sixties ( SBE ?) made an amp with what ... 16 sweep tubes ? Don W4DNR Well.... maybe ten... http://www.radiowrench.com/sonic/so02192.html _________________________________________; /archives//html/Amps/2013-06/msg00065.html (8,451 bytes)
12. Re: [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 21:05:04 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: Hadn't realized they used water cooling on 'ol Sparky. That was certainly thoughtful of them. :-) 73, Bill W6WRT ____________________________________________; /archives//html/Amps/2013-06/msg00066.html (9,703 bytes)
13. Re: [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 21:13:13 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: I realize the pitfalls, but with DI or distilled water, I was thinking of completely submerging the transistors and heatsink. Sounds a bit loony but it might; /archives//html/Amps/2013-06/msg00067.html (9,557 bytes)
14. Re: [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 21:17:43 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: Very interesting. My original thought was the NXP part but I was tempted by the idea of a transformerless power supply and that means way more than 50 VDC. D; /archives//html/Amps/2013-06/msg00068.html (9,277 bytes)
15. Re: [Amps] Advice needed for SS amp (score: 1): Author: Dan Levin <dan@andlev.com>; Date: Wed, 5 Jun 2013 21:24:25 -0700; FWIW, cooling 750 watt parts is going to be a PITA. All the more so if you use two of them push-pull on the same amplifier module / board. Water will help, but only somewhat, and has been mentioned i; /archives//html/Amps/2013-06/msg00069.html (9,435 bytes)
16. Re: [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 21:24:41 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: If anyone wonders why these days the FCC requires type acceptance of commercial amps, here's your answer. :-) 73, Bill W6WRT ________________________________; /archives//html/Amps/2013-06/msg00070.html (9,195 bytes)
17. Re: [Amps] Advice needed for SS amp (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Thu, 6 Jun 2013 07:30:02 +0300; Tokyo High power have marketed one of these and there is a paper in QST that you might use as starters. I would recommend going with the ARF 1501 with a 1200 VDC drain rating just to be on the safe s; /archives//html/Amps/2013-06/msg00071.html (11,984 bytes)
18. Re: [Amps] Advice needed for SS amp (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 05 Jun 2013 21:46:57 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: The output impedance of the devices is pretty close to 50 ohms, so I was thinking of using a 1:1 toroid transformer type antenna balun for the output transfo; /archives//html/Amps/2013-06/msg00073.html (9,714 bytes)
19. Re: [Amps] Advice needed for SS amp (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Thu, 6 Jun 2013 07:47:42 +0300; The high value of capacitance is required for dynamic regulation: you have jumps in the current from about 2A quiescent to about 10 or 12 Amp at full output. Remember, the output impedance is quite c; /archives//html/Amps/2013-06/msg00074.html (12,604 bytes)
20. Re: [Amps] Advice needed for SS amp (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 06 Jun 2013 00:48:43 -0400; Water cooling is nice, but you are probably going to need either DI or distilled water at those voltages and water cooling can be a royal PITA when things go wrong. REPLY: I realize the pitfalls, bu; /archives//html/Amps/2013-06/msg00075.html (12,701 bytes)

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