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Old 6th Dec 2018, 11:50 pm   #1
whiskas
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Default Info about 'FS40' transistors

Hi All

Does anyone have any info or data, equivalent info for an FS40 transistor?
I'm interested in building a project from a 1988 ETI magazine which uses them but don't find any info online...??

Can anyone help please?

Cheers,
Rob
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Old 7th Dec 2018, 12:09 am   #2
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Default Re: Info about 'FS40' transistors

Does it not give any information about them, why that type, are they a 'must use' type or whatever it is won't work? What is it you want to build?
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Old 7th Dec 2018, 7:00 am   #3
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Default Re: Info about 'FS40' transistors

Could it be the 2S40 transistor?

https://alltransistors.com/transisto...ransistor=6706

As Sideband says the key is more information, perhaps a direct link to the article or a circuit diagram/
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Old 7th Dec 2018, 12:29 pm   #4
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Default Re: Info about 'FS40' transistors

Look Like Jan 1988 Starting at page 52 is a possibility

https://www.americanradiohistory.com...ay-1988-01.pdf

Looks like any general purpose NPN could be used

Cheers

Mike T
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Old 8th Dec 2018, 4:25 pm   #5
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Default Re: Info about 'FS40' transistors

Yup that's the project I'm interested in, it's a mains filter. The original article shows a PCB overlay indicating a plastic TO-92 transistor so I doubt it's the 2S40 as I think that's a metal can type..?
I wonder if it's a typo, or some odd equivalent number the original article builder used..?
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Old 8th Dec 2018, 5:42 pm   #6
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Default Re: Info about 'FS40' transistors

This article suggests to use BC317, MPS3646 as well:

https://www.americanradiohistory.com...rch=%22fs40%22

Lawrence.
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Old 8th Dec 2018, 5:58 pm   #7
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Default Re: Info about 'FS40' transistors

I can't see anything particularly taxing about the circuit. I never understand why designers of homebrew projects specify obscure components for no good reason. If a 2N2222 or BC107 is suitable, why not say so and save constructors a bit of grief?
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Old 8th Dec 2018, 6:01 pm   #8
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Default Re: Info about 'FS40' transistors

Well spotted Lawrence.

The BC317 is a silicon transistor and so it will not be a 2S40 as I suggested as the 2S40 is germanium.
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Old 9th Dec 2018, 9:59 am   #9
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Default Re: Info about 'FS40' transistors

Rob ,have you seen the corrections in the "whoops"section of later issues? (page 56 of Sept 88 ETI)
Not the transistor but a couple of errors in the original article.
https://www.americanradiohistory.com...ay-1988-09.pdf
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Old 9th Dec 2018, 10:29 am   #10
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Default Re: Info about 'FS40' transistors

2S40 seems to be a PNP device.

The schematic shows two NPN devices, and the F in FS40 is clearly legible.

You should be able to get away with almost any general purpose NPN. A silicon one would give a little more offset before the bargraph starts to read, a germanium device would give a little less. No big deal. The whole bargraph part is just a toy, it doesn't really contribute anything to the job of filtering spikes and noise off the mains. It might act as a reassurance to the user that the filter is being hit by things, but with no real scale of voltage or time it's pretty meaningless.

David
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Old 9th Dec 2018, 7:47 pm   #11
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Default Re: Info about 'FS40' transistors

Thanks chaps for your help and for pointing out the article errors!
I think I'll try BC317's then
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