another bizarre audio circuit

For the same reason people build ships in bottles, when you can build a far more durable working model much more easily by heaving out the bottle.

And the same reason people compose sonnets, and even sometimes fail to cheat at solitaire.

Cheers

Phil Hobbs

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Yeah, and everyone needs to use 'em or they'll stop making 'em.

I would like a better SMD to DIP (8 pin) converter. The ones from ?Syracuse elec.? have big fat/ long pads on the smd side. I'd like a lot less copper.

George H.

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So you'll know what to do when,

You're stuck on a desert island with three cocanut shells, some wire and a 555 timer.....

Seriously I don't use the 555 anymore, but we have several old circuits still using it. And I hope it and the 741 have only reached middle age.

George H.

George H.

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I don't either, at least not in real circuits, but I could imagine situations where I might, e.g. in a missing pulse detector for a laser interlock. It could look for a 'sanity' pulse from a micro, and turn off a relay to open the interlock. I've used programmable unijunctions for that in the past, but that was mostly for fun. Either way, that job shouldn't be done by a PIC, because it's processor or firmware failures it's designed to detect.

I just get tired of the chronological snobbery of 'legacy' this and 'obsolete' that. As one of my daughters' friends said, "I get really sick of being told by aging baby boomers that I'm out of date because I don't subscribe to their 1968 worldview."

Cheers

Phil "mine's more 1168" Hobbs

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Folks used the i80186 in the motion control industry for years, and it was never a consumer PC product.

They went straight to the already also "done" i80286 when they replaced the XT (8088).

The '186' is still used, but there are more efficient microcontrollers with more 'features' out there so it rarely gets used any more. It actually IS all but obsolete.

The 555 doesn't exactly follow that track as being a simpler device, it does still get used in many instances.

If it uses the 555, the odds are heavily in favour of it being a legacy design. Nowadays rhere are better ways of doing what the 555 can do.

The 2N2222 a simpler part. The strength of the 555 was that it combined a monostable with a relatively high current switch. These turn out to be functions that don't really work well together. The

You'd like to think so. It's a pity that you can't think straight. but it does the advantage that it leads you to spectacularly comic pratfalls. This is one of them.

-- Bill Sloman,Nijmegen

Where can I buy some of those 2N222's?

John

They only come in packs of ~10.

But they are much more expensive than the 2N2222.

Better hurry. There are only four left, at $14.94 each

You do know the difference between a normal 2n2222 and a 'jan' prefix part, right?

That's the reason it is at $15.

The transistor in the link above is a 2N222, not a 2N2222. It's expensive because it's a rare antique PNP germanium no longer in production.

John

John -

You can count on AlwaysWrong to be, well, AlwaysWrong.

John

Larkin gave him the name.

So, you really are in the dark about jan mil parts. Interesting.

My error was simply a typo. Yours are always far worse.

Very few jan series parts are still 'in production'.

It does occur, and they are not cheap, and one must buy like a million of them to get a production run going.

The only lines left these days are the radiation hardened class.

Accurate nym - er - name.

What a dolt!

BTW - have you noticed that he thinks he is God? (I AM THAT I AM nym)