Most novel LED flasher ?

[Andre]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

So far I have got down to 6 parts + LED, using a regulator IC .

-Andre

 

[Wouter van Ooijen]

Anyone got below 4 parts + LED (rules :- no chips with more than 4

pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

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


Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
PICmicro chips, programmers, consulting

 

[Tony]

I thought the challenge of this, since the demise of the LM3909, was to get it
to run off a single cell?

Tony

 

[Vladimir Vassilevsky]

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

http://www.abvolt.com

 

[Ken Smith]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

1 resistor
1 Thermostat taped to resisitor

 

[John Larkin]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

So far I have got down to 6 parts + LED, using a regulator IC .

-Andre

1 mosfet
1 resistor

(Guess how?)

John

 

[A E]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

So far I have got down to 6 parts + LED, using a regulator IC .

-Andre

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

 

[Boris Mohar]

1 Part: Turn signal flasher ?

...Jim Thompson

0 parts: Flashing LED

http://ca.digikey.com/scripts/ca/dksus.dll?Criteria?Ref=7498&Cat=31785799

--

Regards,

Boris Mohar
Viatrack Printed Circuit Designs http://www3.sympatico.ca/borism/
Aurora, Ontario

 

[N. Thornton]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

So far I have got down to 6 parts + LED, using a regulator IC .

-Andre

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

 

[R. Steve Walz]

1 mosfet
1 resistor

(Guess how?)

John

 

[CWatters]

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.

 

[Rob Judd]

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

Self flashing LED = no parts

You win! You win!

Rob

 

[Fred Bartoli]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

So far I have got down to 6 parts + LED, using a regulator IC .

-Andre

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

Fred.

 

[John Larkin]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

So far I have got down to 6 parts + LED, using a regulator IC .

-Andre

OK, here's an easy one:

1 SOT-23 TinyLogic gate

1 resistor

1 capacitor

John

 

[Watson A.Name - 'Watt Sun']

PUTs are still around.

The simplest is to use 3 pin flasher chip (mostly sold in 4-bonding
pad die form for inclusion in LEDs, but TO-92 package is available).

Best regards,
Spehro Pefhany

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.


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[Kevin McMurtrie]

Hi group

Anyone got below 4 parts + LED (rules :- no chips with more than 4
pins, no PUTs or UJT's, no inductors, no hand picled parts ) ?

So far I have got down to 6 parts + LED, using a regulator IC .

-Andre

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.

 

[Watson A.Name - 'Watt Sun']

OK, here's an easy one:

1 SOT-23 TinyLogic gate

1 resistor

1 capacitor

John

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


--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@

 

[John Larkin]

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

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

John

 

[N. Thornton]

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

 

[Ian Stirling]

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.

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