14 November 2015 If you built a decent power valve LF amp what is the realistic voltage limit to ferrite cored tank circuits? In other words, what plate voltage / current is the limit for say a ferri
I'll say it again V = 4.44.F.N.A.B (all SI units) THAT is how you size ferrite cores. It tells you more or less everything you need to know to make ferrite transformers. Keep B to less than 0.1 at
’ž ’ž From: YO2IS Hi Chris, you have to look in the G3LDO's book, 'The LF Experimenter's handbook', pag.45, there is a fine description of a tube PA by GW4ALG, using in PP the feritte core with 58mm
Hello Andy, Saturday, November 14, 2015 OK, but what about wire breakdown voltages? In all the big air cored LF tanks I have seen the windings are well spaced on ceramic, or Paxolin type grooved form
That 58mm diameter toroid will have a core cross section in the region of perhaps 300mm^2 (about 17mm square). 2000V DC supply if it is being used as a transformer, means something like 1400V RMS m
Hello Mal, Saturday, November 14, 2015 Well, I was warned that I was being a cheapskate making the rectifier board out of Tufnol, but did I listen? 5kV and Tufnol and a months operation = *big* bang
Hi Chris, Am 14.11.2015 21:00, schrieb Chris Wilson: OK, but what about wire breakdown voltages? In all the big air cored LF tanks I have seen the windings are well spaced on ceramic, or Paxolin type
Vrms max = 2pi * frequency * number_of_turns * cross_sectional_area * Bmax / sqrt(2) 73, Markus From: [email protected] Clemens Paul Sent: Sunday, November 15, 2015 10:18 AM To: rsgb_lf_group@blacksheep.
Here as picture (screenshot from mini ring core calculator), perhaps more convenient to read (formula rearranged). 73 Clemens DL4RAJ Attachment: calc.en.gif Description: GIF image
AH HA ......... I see the significance of your question. 176 = 4 * 44 :-) That factor 4.44 (or 4,44) is actually SQRT(2) * PI 'jnt On 15 November 2015 at 09:18, Clemens Paul <[email protected]> w
If this is of any use to anyone, I have made a simple online calculator: http://people.physics.anu.edu.au/~dxt103/calculators/toroid.php 73, Dimitris VK2COW
Hello Chris and group, I failed to store all the postings of this thread - so sorry if some aspects of the following comments should have been already discussed or could be boaring to all of you succ
Hi OM's here is a new Version 1.3.0 MiniRingKernRechner for Windows. The Program run whith Linux-WINE without problems. http://www.dl0hst.de/mini-ringkern-rechner.htm 73 Eberhard DL3ZID A
Hello Szigy, Saturday, November 14, 2015 OK, will look this out, thanks for the info Szigy, have you any info on your own amp on the internet, would love to see it! All the best and thanks again. --
Hello eberhardvwedelstaedt, Monday, November 16, 2015 Downloaded, installed and running fine under Win 7 64 bit, thanks Eberhard, it's a nice tool, all the best! -- Best regards, Chris 2E0ILY mailto:
Hello Dimitrios, Sunday, November 15, 2015 Thanks Dimitrios, bookmarked, another very useful tool. -- Best regards, Chris 2E0ILY mailto:[email protected]
Hello DK1IS, Sunday, November 15, 2015 Awesome reply Tom, some great information for me to dwell on there. Insulation breakdown is indeed a worry I have. A GS35B needs 3kV on the plate to really get
