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References: [ +from:AVILASECA@BLUEWIN.CH: 72 ]

Total 72 documents matching your query.

21. Re: [Amps] Silly Inductor Question (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Wed, 09 Feb 2005 16:40:27 +0100
You can stack some cores, but maybe a more elegant solution would be to cut a small gap with a fret saw into the core. That would interrupt the magnetic path and prevent saturation. Fill the gap with
/archives//html/Amps/2005-02/msg00337.html (9,056 bytes)

22. [Amps] Screen grid supply (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Wed, 16 Feb 2005 09:18:01 +0100
I am building a 3.5-30 MHz amp with 2 grid-driven 4CX250Bs. I have already built the screen grid supply with resistors from the +2000V plate supply, shunted by a string of Zener diodes to ground. The
/archives//html/Amps/2005-02/msg00543.html (7,036 bytes)

23. Re: [Amps] slug tuned variable inductors (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Thu, 17 Feb 2005 07:56:40 +0100
Should linear size (1/2" O.D., by 1/4" I.D. Angel Vilaseca HB9SLV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/am
/archives//html/Amps/2005-02/msg00557.html (10,337 bytes)

24. [Amps] HV stabilisation in a triode amp (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Fri, 22 Sep 2006 12:22:03 +0200
Hi, In a tetrode amp, the screen voltage must be well regulated. A lot of ripple on the plate voltage does not matter, providing the plate voltage is well regulated. On the other hand, how about a tr
/archives//html/Amps/2006-09/msg00279.html (6,541 bytes)

25. Re: [Amps] Bad tubes from Ebay (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Wed, 04 Oct 2006 07:48:00 +0200
How can a gassy tube cause a flashover? You would expect the electrons to collide with gas molecules within the tube, hence to decrease plate current. But how can this possibly cause a short circuit
/archives//html/Amps/2006-10/msg00011.html (6,944 bytes)

26. [Amps] Is RF parts still in business? (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Thu, 05 Oct 2006 07:54:49 +0200
Hi all, I sent an order to RF parts several weeks ago. Received nothing. Tried to e-mail them at several of their addresses. No answer. Are they still in business? Angel Vilaseca HB9SLV _____________
/archives//html/Amps/2006-10/msg00040.html (7,656 bytes)

27. [Amps] Russian power L-coupler (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Fri, 17 Nov 2006 13:37:45 +0100
Hi, On Ebay, I saw some russian L-couplers for sale. They are made of two coils, both wound on a virtual sphere. One of the coils is slightly smaller and placed within the larger one. The inner coil
/archives//html/Amps/2006-11/msg00214.html (6,606 bytes)

28. [Amps] filament choke (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Mon, 18 Dec 2006 08:08:59 +0100
Hi, On almost every grounded-grid triode amp design I have seen, the filament choke is an abt 35 uH coil wound on a 1/2 inch dia, 7-inch long ferrite rod. Such a large unit is a bit cumbersome. Inste
/archives//html/Amps/2006-12/msg00129.html (6,520 bytes)

29. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Thu, 21 Dec 2006 07:27:45 +0100
Manfred, If this project is the same quality and benefit to the home-builder as your Fodtrack (and I am sure it will be), please go ahead! Angel HB9SLV Manfred Mornhinweg a &eacute;crit : ___________
/archives//html/Amps/2006-12/msg00186.html (13,079 bytes)

30. Re: [Amps] resonant filter tspa (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Tue, 15 May 2007 08:02:38 +0200
John, Thanks for this post. I am keeping it as a reference. I have a couple of questions: How can the Harris filter (7 H * 0.25 uF = 1.75) and the Galaxy filter ( 4 H * 0.1 uF = 0.4 ) be both resonan
/archives//html/Amps/2007-05/msg00132.html (15,306 bytes)

31. Re: [Amps] An inexpensive choke for a resonant filter (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Wed, 16 May 2007 07:45:24 +0200
Jim I see from your simulation that a 2 H inductance is typical for a HV secondary. I wonder if a HV transformer from a microwave oven cold be recycled in a HV power supply, using its secondary windi
/archives//html/Amps/2007-05/msg00140.html (11,128 bytes)

32. Re: [Amps] An inexpensive choke for a resonant filter (score: 1)
Author: Angel Vilaseca <AVILASECA@BLUEWIN.CH>
Date: Thu, 17 May 2007 10:13:43 +0200
Marv, Thank you for this very useful information. Maybe the primary of a microwave oven could be wired in series with the secondary (forward or backwards, depending on the inductance you want) and be
/archives//html/Amps/2007-05/msg00145.html (10,404 bytes)

33. [Amps] automatical blower speed regulation (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Tue, 22 May 2007 07:26:43 +0200
Hi all, To automatically regulate blower speed, how about the following: Assume you have a 30 W, 110 V blower. Wire a 110 V - 6 volt 30 VA transformer secondary in series with the HV primary transfor
/archives//html/Amps/2007-05/msg00160.html (6,819 bytes)

34. [Amps] Using HV rectifiers from microwave ovens (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Fri, 16 Nov 2007 13:40:01 +0100
Hi, For my 3000 V , 500 mA power supply, I will use some microwave oven rectifiers, which are rated 7 Kv, 500 mA. To increase the current safety margin I will wire two rectifiers in parallel in each
/archives//html/Amps/2007-11/msg00220.html (8,520 bytes)

35. Re: [Amps] Using HV rectifiers from microwave ovens (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Mon, 19 Nov 2007 11:41:41 +0100
Thanks for the answers. The 1N 5408 seem to be the best way to go. I will buy some. 73 Angel Vilaseca HB9SLV k7rdx a &eacute;crit : _______________________________________________ Amps mailing list A
/archives//html/Amps/2007-11/msg00273.html (10,851 bytes)

36. [Amps] 4CX250B in grounded grid and screen configuration (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Tue, 20 Nov 2007 11:47:02 +0100
Hi, I have several used 4CX250Bs that I want to try to put to use. State of the tubes is unknown. They are pullouts. I will test them including hipot, as was detailed on this list a few days ago. Now
/archives//html/Amps/2007-11/msg00282.html (7,815 bytes)

37. [Amps] Autotransformer (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Fri, 07 Dec 2007 08:51:40 +0100
Hi, I have a nice 1 KW HV transformer with a 110 V primary. Unfortunately, mains in the shack is 220 V only. I also have several unused transformers with a 220 V primary tapped for 110 V. So I was th
/archives//html/Amps/2007-12/msg00030.html (6,401 bytes)

38. Re: [Amps] Ferrite (was: how to wind an HF broadband 10:1 transformer) (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Thu, 06 Mar 2008 07:56:34 +0100
Another situation where excessive wire length can lead to unwanted resonance effects (overheating) is the plate choke. If the plate choke was wound on a ferrite rod, or toroid, much less wire length
/archives//html/Amps/2008-03/msg00043.html (29,286 bytes)

39. [Amps] current in primary of microwave oven transformer (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Wed, 23 Apr 2008 08:28:06 +0200
Hi, I have a microwave oven transformer that I plan to use for my next HV power supply. With the secondary unloaded and 220 V into the primary, I measured 670 mA through it. This is a 220 V unit so t
/archives//html/Amps/2008-04/msg00264.html (7,182 bytes)

40. Re: [Amps] current in primary of microwave oven transformer (score: 1)
Author: Angel Vilaseca <avilaseca@bluewin.ch>
Date: Thu, 24 Apr 2008 08:53:39 +0200
Good mews then! My MOTs are OK. Bad news: although no real power is delivered to my house, the power company will bill me for it! :-) Thanks for your help, guys! Angel Vilaseca HB9SLV Alex a écrit :
/archives//html/Amps/2008-04/msg00288.html (12,136 bytes)


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