Most novel LED flasher ?

I would cheat: take an 8-pin PIC and remove the 5 unneeded pins (after programming, because that requires 5 pins).

Wouter van Ooijen

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Logic NOT gate in SOT-23-4 package + resistor + capacitor = 3 parts. Two transistors + resistor + capacitor = 4 parts.

Self flashing LED = no parts

:)

Vladimir Vassilevsky, Ph.D.

DSP and Mixed Signal Design Consultant

Andre wrote:

(Guess how?)

John

Is a battery included in the 'parts'? And how many times does it need to flash? Whatever happened to UJTs? sigh....

Hi

If we could use hand pickled parts, just what would we do with them? Think... light emiting diode... will a pickle behave as a diode? if so, the hand pickled onion can be our light emitting diode, with the help of about 240v. Aha, as it burns up it may well flicker and flash to some extent too.

I like the idea of cutting some pins off that 8 pin IC better - bit more practical :)

BTW would the fork prongs be classed as pins? Mind you, if its not a chip, it could have as many pins as you like according to your above spec. So you cant eat the pickle with chips.

Regards, NT

---------------------- Gate capacitance?: High-valued resistor from Vdd to Gate, connect Gate to Drain, LED from Vdd to Drain, Source to Ground.

-Steve

Someone wrote..

Use a LDO regulator with the wrong output capacitors to make it unstable - can't be sure it will oscilate at the right freq though.

You win! You win!

Rob

"Andre" a écrit dans le message news: snipped-for-privacy@posting.google.com...

What about a fluorescent lamp starter (and maybe a shunt R)?

Fred.

OK, here's an easy one:

1 resistor

John

In article , snipped-for-privacy@interlog.com mentioned...

flash?

Just 1 part, a buzzer or relay connected as a buzzer. Maybe a current limiting resistor. Nothing was said about flash rate. If that is too fast, add weight to the armature to slow down the flash rate.

Apply tiny current through a blue LED backwards. Now run it under normal conditions. It will flicker and flash as its damaged crystal burns away.

No I limit resistor in series with the LED? So what's the supply voltage?

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Whatever makes the LED look good. If the resistor is big enough, you can leave out the cap!

John

Hi

another one: resistor + capacitor + neon to make a neon flasher. Supply V should be close to neon Vbreakdown. Now put LED in series with the R so LED lights during C charging, but goes out as C nears Vmax.

Of course you dont need the LED, you could in most cases leave that out.

Regards, NT

Apply a really tiny current through a standard LED. It will emit photons more or less randomly. Only need a resistor.

Which brings to mind the flasher that is shown on some electronics websites. It is a LED and a C-B junction of a transistor, connected so that it is reverse biased, and also a capacitor. It's here