That was not an overgeneralisation. It was location and experiment specific.
Yes Alan, but you are not everyone!
Frank Gordon's "Lattice Energy Converter (LEC)"...replicators workshop
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60 Hz hum is mostly what I was removing. How well it worked was surprising to me. I put them on almost everything now
That is really weird. Are these big LF ferrites? Even so they will filter 50Hz only on low impedance, things like grounds and power supplies.
for example:
Here is a LF ferrite
https://uk.rs-online.com/web/p/ferrite-sleeves/1857492?gb=s
here are its impedance characteristics:
That is 0.005 ohm at 50Hz. Not much filtering even on a PSU line!
Unless you have a lot of turns. e.g. 100 turns => 50 ohm at 50Hz
Maybe you mean something like this - a wound inductor (100mH)
https://uk.rs-online.com/web/p/leaded-inductors/1911226?gb=s
At 50Hz that is still mainly resistive?
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I have used a large iron core toroid to hold the plate to measure in place, since it is rather heavy
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That is really weird. Are these big LF ferrites? Even so they will filter 50Hz only on low impedance, things like grounds and power supplies.
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Typical about 6-8 mm diameter cylinder or ring the same length (or sometimes up to twice as long) as it is in diameter. Looks like it is made of black hematite or something similar. A couple or few wraps of the ‘noisy” wire from the outside and through the inside (like 1/2 a transformer) and on its way again fixes up a ton of noise. Big ones on power supply wires (normally already there), little ones on signal wires. Made a huge difference on data logging.
I scavenged many of these from 1980’s or older electronics once upon a time and filled up a little jar while stocking up on big power resistors and giant diodes, etc. -
Typical about 6-8 mm diameter cylinder or ring the same length (or sometimes up to twice as long) as it is in diameter. Looks like it is made of black hematite or something similar. A couple or few wraps of the ‘noisy” wire from the outside and through the inside (like 1/2 a transformer) and on its way again fixes up a ton of noise. Big ones on power supply wires (normally already there), little ones on signal wires. Made a huge difference on data logging.
I scavenged many of these from 1980’s or older electronics once upon a time and filled up a little jar while stocking up on big power resistors and giant diodes, etc.Maybe that was higher frequency noise on mains (which you get? 50hz is just too low for that much inductance to do anything.
I agree ferrites are a godsend for reducing nasty hf noise, switching noise, etc. esp because they go soft so do not resonate nastily when used with feedthrough caps.
Here is the highest Al ferrite I can find
800uH
=> impedance at 50Hz only 0.3 ohm for 1 turn - ok 3 turns that goes up to 3 ohms!
So they will have zero effect on 50Hz in almost any scenario: they would help a bit before big reservoir caps on PSUs but you'd need to watch saturation due to dc current then.
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Maybe that was higher frequency noise on mains (which you get? 50hz is just too low for that much inductance to do anything.
I agree ferrites are a godsend for reducing nasty hf noise, switching noise, etc. esp because they go soft so do not resonate nastily when used with feedthrough caps.
Here is the highest Al ferrite I can find
https://www.digikey.co.uk/en/p…cA8ugCy%2BTLgCuAJ3wgAvmqA
800uH
=> impedance at 50Hz only 0.3 ohm for 1 turn - ok 3 turns that goes up to 3 ohms!
So they will have zero effect on 50Hz in almost any scenario: they would help a bit before big reservoir caps on PSUs but you'd need to watch saturation due to dc current then.
I tried a bunch of cap scenarios unsuccessfully and then tried the silly things and I could barely believe how well it worked so I was sold.
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I heard from a friend that the effect might be working like zinc-air battery, with moisture in air working as electrolyte. Not sure if that applies, but i tried adding some tap water between two metal plates, nickel and steel, and got 150 mV. So that is something to consider. Also my tests that failed were done when outside temp was rather low, so inside air must have been dry.
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I heard from a friend that the effect might be working like zinc-air battery, with moisture in air working as electrolyte. Not sure if that applies, but i tried adding some tap water between two metal plates, nickel and steel, and got 150 mV. So that is something to consider. Also my tests that failed were done when outside temp was rather low, so inside air must have been dry.
This has been studied in depth, I recommend you reading the documentation and watching the presentations at the beginning of this thread. Obvious effects have been all discarded.
