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Re: Ferrite ID

From Brian Gregory <void-invalid-dead-dontuse@email.invalid>
Newsgroups sci.electronics.design
Subject Re: Ferrite ID
Date 2026-09-28 23:30 +0100
Organization https://www.Brian-Gregory.me.uk/
Message-ID <ni0843FpbmkU1@mid.individual.net> (permalink)
References <11965md$1i$1@reader1.panix.com> <ld3ebld0uqu18tuepnibpbns9ug7fmfgq9@4ax.com> <1197pbd$8hpc$1@dont-email.me> <p5rfbl1psglmnb2i8cpqvfcspdcnk3v4d2@4ax.com> <119ad93$13i5d$2@dont-email.me>

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On 27/09/2026 07:32, Bill Sloman wrote:
> But we haven't been told how Rheem went from mains AC to to the current 
> that they put through their resistive heaters. It won't have been 
> through a 50Hz mains transformer - higher frequency transformers are 
> much cheaper and more compact.

Apparently they use a Triac so that they have full control over the 
power fed into the heaters. The control system seems to attempt to make 
a kind of PID control loop to keep a constant temperature no matter what 
the flow rate is.

That does explain the large spikes, potentially one every mains half cycle.
That kind of control system really needs a lot more than a ferrite to 
reduce spurious emissions.

-- 
Brian Gregory (in England).

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Thread

Ferrite ID David Lesher <wb8foz@panix.com> - 2026-09-25 15:58 +0000
  Re: Ferrite ID John R Walliker <jrwalliker@gmail.com> - 2026-09-25 17:02 +0100
  Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 02:55 +1000
  Re: Ferrite ID john larkin <jl@htigct.com> - 2026-09-25 17:13 -0700
    Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 16:39 +1000
      Re: Ferrite ID john larkin <jl@glen--canyon.com> - 2026-09-26 09:10 -0700
        Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 16:32 +1000
          Re: Ferrite ID Brian Gregory <void-invalid-dead-dontuse@email.invalid> - 2026-09-28 23:30 +0100
            Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-29 19:15 +0000
              Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-30 17:24 +1000
                Re: Ferrite ID john larkin <jl@glen--canyon.com> - 2026-09-30 07:50 -0700
                Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-30 20:00 +0000
        Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 16:34 +1000
        Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
      Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
    Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
  Re: Ferrite ID Ian <devnul@blackhole.com> - 2026-09-26 11:57 +0100
    Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-29 00:42 +1000
      Re: Ferrite ID Martin Rid <martin_riddle@verison.net> - 2026-09-28 11:04 -0400
        Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-10-01 04:15 +0000
      Re: Ferrite ID Ian <devnul@blackhole.com> - 2026-09-30 17:47 +0100

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