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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+\.01uf\s+caps\s+across\s+diodes\s+\?\s*$/: 20 ]

Total 20 documents matching your query.

1. [Amps] .01uf caps across diodes ? (score: 1)
Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>
Date: Tue, 29 Nov 2022 11:28:23 -0800
What's the consensus on wiring .01uf disc caps across diodes in a HV supply ? W8JI sez they are required, and used in ameritron amps....and used to eliminate switching transients. Some say the caps a
/archives//html/Amps/2022-11/msg00089.html (6,896 bytes)

2. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Jim Barber <barberaudio@gmail.com>
Date: Tue, 29 Nov 2022 12:07:19 -0800
I've never seen a HV bridge fail because of "switching transients". Do they exist? I don't know but if they do I have no evidence they're of critical concern. I have, however seen bridge diodes and e
/archives//html/Amps/2022-11/msg00090.html (8,374 bytes)

3. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Fern Rivard via Amps <amps@contesting.com>
Date: Tue, 29 Nov 2022 22:45:46 +0000 (UTC)
Hey Jim, that's old crap. The older style diodes needed those caps across them but the newer style ones that have been out for years don't require that anymore. Fern  VE7GZ Some say the caps are requ
/archives//html/Amps/2022-11/msg00092.html (8,258 bytes)

4. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Sun, 11 Dec 2022 21:03:23 -0500
W8ZR Jim Can you give advice on this topic? 73 Tim K3LR What's the consensus on wiring .01uf disc caps across diodes in a HV supply ? W8JI sez they are required, and used in ameritron amps....and use
/archives//html/Amps/2022-12/msg00031.html (8,080 bytes)

5. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Don Moman VE6JY <ve6jy.1@gmail.com>
Date: Sun, 11 Dec 2022 19:23:06 -0700
I was under the impression they were there to keep any possible RF from appearing across the electrolytics. Don VE6JY _______________________________________________ Amps mailing list Amps@contesting
/archives//html/Amps/2022-12/msg00032.html (8,611 bytes)

6. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Sun, 11 Dec 2022 22:32:29 -0800
Hi Tim, Ive followed this debate for years and frankly I dont think adding .01uF caps across each diode in a diode string makes much difference one way or the other. Its true that there will be some
/archives//html/Amps/2022-12/msg00034.html (9,327 bytes)

7. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: "hzp_electronics@juno.com" <hzp_electronics@juno.com>
Date: Mon, 12 Dec 2022 17:19:47 GMT
Hi Jim The best argument that I have heard about capacitors across diodes is that older diodes had uneven capacitance. Under certain conditions the capacitance would cause the voltage to divide uneve
/archives//html/Amps/2022-12/msg00039.html (10,167 bytes)

8. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Jim W7RY <jimw7ry@gmail.com>
Date: Mon, 12 Dec 2022 17:16:03 -0600
Agreed. Jim W7RY On 12/12/2022 12:32 AM, MU 4CX250B wrote: Hi Tim, Ive followed this debate for years and frankly I dont think adding .01uF caps across each diode in a diode string makes much differe
/archives//html/Amps/2022-12/msg00040.html (10,024 bytes)

9. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Mon, 12 Dec 2022 18:11:36 -0800
Hi Bill, I remember that argument,too, but It doesnt carry much water with todays uniform components. The back resistance of a series string of diodes is so high that I doubt an uneven capacitive vol
/archives//html/Amps/2022-12/msg00041.html (11,562 bytes)

10. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Tue, 13 Dec 2022 08:28:20 +0000
It's not only uniformity, also the 'controlled avalanche' of modern diodes. As you reach breakdown they don't fail instantly from too much reverse voltage, they start to conduct slightly. In a string
/archives//html/Amps/2022-12/msg00042.html (11,673 bytes)

11. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Tue, 13 Dec 2022 09:21:02 -0800
An interesting point, Steve. If I understand you, youre saying that if a modern diode in a series string approaches reverse breakdown, it will start to conduct, thus shifting its overload voltage to
/archives//html/Amps/2022-12/msg00043.html (14,395 bytes)

12. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Ron W4BIN <ka4inm@gmail.com>
Date: Tue, 13 Dec 2022 19:52:44 -0500
An interesting point, Steve. If I understand you, youre saying that if a modern diode in a series string approaches reverse breakdown, it will start to conduct, thus shifting its overload voltage to
/archives//html/Amps/2022-12/msg00047.html (9,771 bytes)

13. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Tue, 13 Dec 2022 20:38:39 -0500
My question around the .01 uF caps on the HV rectifier diodes was not so much about diode preservation or protection - I am curious about any possible RFI generation from the HV diodes or more import
/archives//html/Amps/2022-12/msg00050.html (10,725 bytes)

14. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 14 Dec 2022 11:50:46 +0800
Yes. That is the reason I thought the caps are there. To stop noise in the receiver. Someone, on this forum or the other one, a year or three ago, said that the noise was real and that the capacitors
/archives//html/Amps/2022-12/msg00056.html (11,178 bytes)

15. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: sm0aom--- via Amps <amps@contesting.com>
Date: Wed, 14 Dec 2022 08:55:04 +0100 (CET)
The large characteristic spread of silicon rectifiers of "yesteryear" often resulted in reliability problems. One early task I got as a systems engineer in 1981 was to investigate why the 6 kV six-pu
/archives//html/Amps/2022-12/msg00058.html (17,487 bytes)

16. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Wed, 14 Dec 2022 10:48:31 +0200
During the early 1960s I worked at a BC station where we had a 5 kW FM transmitter. It had a full-wave bridge rectifier consisting of 4 boards, each of which had some 16 400-piv diodes on it. I think
/archives//html/Amps/2022-12/msg00060.html (17,102 bytes)

17. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Wed, 14 Dec 2022 10:49:27 +0200
During the early 1960s I worked at a BC station where we had a 5 kW FM transmitter. It had a full-wave bridge rectifier consisting of 4 boards, each of which had some 16 400-piv diodes on it. I think
/archives//html/Amps/2022-12/msg00061.html (16,958 bytes)

18. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Wed, 14 Dec 2022 08:52:51 +0000
Yes, that's my understanding of it. Some years ago there was quite a bit of discussion about it here. Steve G8GSQ On 13/12/2022 17:21, MU 4CX250B wrote: An interesting point, Steve. If I understand y
/archives//html/Amps/2022-12/msg00062.html (14,632 bytes)

19. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: Steve Thompson <g8gsq@gmx.com>
Date: Wed, 14 Dec 2022 08:55:10 +0000
As I understand it, the diode doesn't go low resistance when it avalanches, it's more like the characteristic we associate with a zener type diode so it maintains its own particular breakdown voltage
/archives//html/Amps/2022-12/msg00063.html (11,077 bytes)

20. Re: [Amps] .01uf caps across diodes ? (score: 1)
Author: "Gary Schafer" <garyschafer@largeriver.net>
Date: Wed, 14 Dec 2022 16:08:01 -0600
Hi Tim, Years ago I built a receiver and needed a power supply but the transformer I had was to much voltage. So rather than just a capacitive input filter I put a choke of a few henrys between the d
/archives//html/Amps/2022-12/msg00065.html (13,858 bytes)

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