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Total 58 documents matching your query.

1. [AMPS] Diodes (score: 1): Author: rfamps@ic24.net (Steve Thompson); Date: Mon, 21 Feb 2000 10:46:27 -0800; While searching for a part for work, I worked through the rectifiers section of the Farnell (Premier) catalogue. Philips, in particular seem to have quite a range of 4-8A diodes with 1kV+ rating, at; /archives//html/Amps/2000-02/msg00411.html (8,176 bytes)
2. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Mon, 21 Feb 2000 09:51:35 -0700; Add the cost and inconvience of heat sinks. I built a FWD, 9100v no-load 8171 supply with 3A diodes. It is still working, 19-years later. There is bound to be some piv variation. To find out what's; /archives//html/Amps/2000-02/msg00430.html (8,449 bytes)
3. [AMPS] Diodes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 21 Feb 2000 18:16:40 -0000; Yes. If the diode breaks down, there's more volts and more amps in the rest of the diodes - generally, not for too long. I haven't seen that many diodes with guaranteed controlled avalanche character; /archives//html/Amps/2000-02/msg00433.html (8,547 bytes)
4. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Mon, 21 Feb 2000 23:28:22 -0700; On each cycle, 'equalised" diodes are forced to have unequal reverse currents by the "equalisation" circuitry. . Unequalised diodes always have identical reverse currents. The 1995 to 2000 Handbooks; /archives//html/Amps/2000-02/msg00470.html (8,094 bytes)
5. [AMPS] Diodes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 22 Feb 2000 09:27:44 -0000; So what? That doesn't matter. What causes breakdown in the junction is excess reverse current, leading to heating which causes more current which....etc. It doesn't matter if the currents are unequal; /archives//html/Amps/2000-02/msg00478.html (9,710 bytes)
6. [AMPS] Diodes (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 22 Feb 2000 09:48:06 -0600; How true, Peter. One of my pet pieves is the formula that has been in the handbook for years on how to figure the value of a plate blocking capacitor. Just plug in some typical numbers, and see how; /archives//html/Amps/2000-02/msg00484.html (8,341 bytes)
7. [AMPS] Diodes (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 22 Feb 2000 10:53:13 -0500; I was reading the HF amps section the other day, and was surprised to read the flat statement that the filament choke is not necessary in grounded-grid amplifiers at HF. Or did I misunderstand? 73, P; /archives//html/Amps/2000-02/msg00485.html (8,995 bytes)
8. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Tue, 22 Feb 2000 08:14:57 -0700; Two diodes rated at 100piv minimum are connected in series. One diode measures 101piv and the other measures 190piv. The diodes are wired in series. No ''equalization'' is used. A mains surge of 250; /archives//html/Amps/2000-02/msg00488.html (9,396 bytes)
9. [AMPS] Diodes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 22 Feb 2000 16:24:27 -0000; diode wired in appears. Maybe. You haven't provided enough information. If the PIVs are that different, the capacities are likely to be so, so the answer is 'quite possibly'. You're assuming that it; /archives//html/Amps/2000-02/msg00491.html (9,065 bytes)
10. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Tue, 22 Feb 2000 08:37:08 -0700; ..... a car battery? -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com S; /archives//html/Amps/2000-02/msg00492.html (9,163 bytes)
11. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Tue, 22 Feb 2000 08:37:11 -0700; Amen, Phil. It was bs like this that made me doubt that the powers that be were up to the job of cleaning house. When Schetgen phoned me and told me to stop writing, it was not much of a surprise th; /archives//html/Amps/2000-02/msg00494.html (9,038 bytes)
12. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Tue, 22 Feb 2000 08:57:18 -0700; series. No ''equalization'' is used. A mains surge of 250p-v Ok. The mains are 50Hz. The equalizers are 10k ohms each. Not a good wager. Without equalization, neither diode's piv limit is exceeded a; /archives//html/Amps/2000-02/msg00495.html (9,222 bytes)
13. [AMPS] Diodes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 22 Feb 2000 17:15:39 -0000; Sorry Rich - NO. Let me repeat: Now, when two capacitors are placed in series ACROSS DC, let alone AC, the voltage divides inversely proportional to the capacitance. So the smaller capacitance gets t; /archives//html/Amps/2000-02/msg00497.html (10,202 bytes)
14. [AMPS] Diodes (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 22 Feb 2000 12:16:42 -0600; That is true if you are talking about indirectly heated tubes with a separate cathode pin(s). The old glass tubes still need one. BTW, I see lots of ridiculously high bids for B&W FC-15's and FC-30'; /archives//html/Amps/2000-02/msg00500.html (8,851 bytes)
15. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Tue, 22 Feb 2000 11:33:38 -0700; True enough. However, you are trying to fly on an assumption. . agreed. 101piv plus 190piv = 291v which exceeds what we need by 41v. .The ''equalizer'' resistors act to divide the 250v surge equally; /archives//html/Amps/2000-02/msg00501.html (10,698 bytes)
16. [AMPS] Diodes (score: 1): Author: 2@vc.net (measures); Date: Tue, 22 Feb 2000 11:33:40 -0700; The 9uH fil. choke in the SB-220 works quite nicely on 160m. To cancel the reactance of the choke, add approx 900pF to C2 in the 160m tuned input. cheers -- FAQ on WWW: http://www.contesting.com/amp; /archives//html/Amps/2000-02/msg00502.html (8,999 bytes)
17. [AMPS] Diodes (score: 1): Author: ve6nap@oanet.com (Gerald Caouette); Date: Tue, 22 Feb 2000 10:23:43 -0700; ve6nap@rac.ca Two diodes rated at 100piv minimum are connected in series. One diode measures 101piv and the other measures 190piv. The diodes are wired in series. No ''equalization'' is used. A mains; /archives//html/Amps/2000-02/msg00503.html (11,234 bytes)
18. [AMPS] Diodes (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 22 Feb 2000 19:42:44 +0000; This is another of those recurring FUQs (Frequently Unanswered Questions - what else?). When it came around about two years ago, I checked direct with the author of the revised Handbook chapter (a po; /archives//html/Amps/2000-02/msg00505.html (11,564 bytes)
19. SV: [AMPS] Diodes (score: 1): Author: sm5ki@algonet.se (sm5ki); Date: Tue, 22 Feb 2000 23:03:33 +0000; Very good your last words, hi. What about noise from the rectifiers modulating the PA? And RF getting into these rectifiers in series? The discs are maybe there to short out the RF? The HEATHKIT SB10; /archives//html/Amps/2000-02/msg00508.html (13,099 bytes)
20. [AMPS] Diodes (score: 1): Author: w8ik@arrl.net (Joe Subich, W8IK); Date: Tue, 22 Feb 2000 19:01:59 -0500; But, just maybe, they actually get it right more often than wrong! -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contes; /archives//html/Amps/2000-02/msg00512.html (8,752 bytes)

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