Stobe circuits for AMT Enterprise E

Often wrong Soong · Post by **Often wrong Soong** » Sun Aug 23, 2009 5:01 am

Hi guys, I need a bit of help with a strobe circuit for my Ent E.
Is there a way of having 2 sets of strobes flashing at different rates on the same circuit, and have the rates adjustable? I want to avoid pic's and LM3909's if possible.
If not, what IC is a good/better alternative to the LM3909?

Cheers meisters!

Soong

walter · Post by **walter** » Mon Aug 24, 2009 10:09 pm

you can use a 555 chip ,one circuit for each strobe rate. I dont know where I found the planes for them but there easy to build. I will try to find the planes.

en'til Zog · Post by **en'til Zog** » Tue Aug 25, 2009 1:42 am

You could use a 556 chip - two separate 555's in one little plastic bug. Or the CMOS equivalent to save much power.

Often wrong Soong · Post by **Often wrong Soong** » Tue Aug 25, 2009 2:40 am

en'til Zog wrote:You could use a 556 chip - two separate 555's in one little plastic bug. Or the CMOS equivalent to save much power.

Yeah, thought about that but im not too good with this stuff and wasnt sure how to get the strobe flash 'abrupt' enough with a 555/6.
Is it just a case of getting the right capacitors and resistors?

USS Atlantis · Post by **USS Atlantis** » Tue Aug 25, 2009 6:52 am

That's exactly it Wrong - with one small addition

Check THIS for the schematic and THIS for the vid of the result

Vary R5 and R4 to get the timing - but keep R4's value well below R5's

Leave the Diode in, that's how you get the quick on-off of a strobe effect from a 555

Often wrong Soong · Post by **Often wrong Soong** » Tue Aug 25, 2009 8:12 am

USS Atlantis wrote:That's exactly it Wrong - with one small addition

Check THIS for the schematic and THIS for the vid of the result

Vary R5 and R4 to get the timing - but keep R4's value well below R5's

Leave the Diode in, that's how you get the quick on-off of a strobe effect from a 555

Awesome cheers Ken, i'll give it a go right now!

DLMatthys · Post by **DLMatthys** » Sat Sep 26, 2009 8:17 pm

What wrong with LM3909s?
I just love the little buggers...I gots hundreds of them at hand!

USS Atlantis · Post by **USS Atlantis** » Sat Sep 26, 2009 8:28 pm

DLMatthys wrote:What wrong with LM3909s?
I just love the little buggers...I gots hundreds of them at hand!

Which is where they all went when thy discontinued them

Into your hoard of diminishing returns, Don

DLMatthys · Post by **DLMatthys** » Thu Oct 01, 2009 11:30 am

USS Atlantis wrote:
Into your hoard of diminishing returns, Don

Over 500 FFB kits sold Ken...
Don't get snippy...It is still a simple, reliable and popular chip back in the 20th Century.

amandacaron · Post by **amandacaron** » Thu Oct 01, 2009 11:55 am

this works for strobes (not my design)

http://www.electro-tech-online.com/atta ... strobe.gif

you can adust the pulse time with the 50k pot then replace it with a matching fixed resistor when its running the way you want it.

USS Atlantis · Post by **USS Atlantis** » Thu Oct 01, 2009 12:00 pm

DLMatthys wrote: Over 500 FFB kits sold Ken...
Don't get snippy...It is still a simple, reliable and popular chip back in the 20th Century.

Sorry if I sounded snippy, Don, wasn't my intent

More of a little poke to the ribs

I know it's a good chip, I used it back in the 80's for various things, point is, it's a dying breed - those of us that don't have access to them anymore have to do things a little differently

Often wrong Soong · Post by **Often wrong Soong** » Thu Oct 01, 2009 2:48 pm

I've still got a LM3909 in my stash but since I needed 2 seperate strobe rates I thought I'd try to use some parts I already have rather than track down more LM3909's online. This is the schematic I settled on, I used a 50k Pot for R2 so I can adjust the rate

http://i546.photobucket.com/albums/hh42 ... ematic.gif

I built up 2 identical circuits and they work like a charm

USS Atlantis · Post by **USS Atlantis** » Thu Oct 01, 2009 3:01 pm

Often wrong Soong wrote:I've still got a LM3909 in my stash but since I needed 2 seperate strobe rates I thought I'd try to use some parts I already have rather than track down more LM3909's online. This is the schematic I settled on, I used a 50k Pot for R2 so I can adjust the rate

http://i546.photobucket.com/albums/hh42 ... ematic.gif

I built up 2 identical circuits and they work like a charm

"This thread is useless without video"

I don't see a thing wrong with the Schematic - and you said it works like a charm

Good going there, Wrong!

We'll teach you electronics yet

Often wrong Soong · Post by **Often wrong Soong** » Fri Oct 02, 2009 8:46 am

USS Atlantis wrote:
Often wrong Soong wrote:I've still got a LM3909 in my stash but since I needed 2 seperate strobe rates I thought I'd try to use some parts I already have rather than track down more LM3909's online. This is the schematic I settled on, I used a 50k Pot for R2 so I can adjust the rate

http://i546.photobucket.com/albums/hh42 ... ematic.gif

I built up 2 identical circuits and they work like a charm
"This thread is useless without video"

I don't see a thing wrong with the Schematic - and you said it works like a charm

Good going there, Wrong!

We'll teach you electronics yet

Your wish is my command Jim, here's a video clip for your viewing pleasure

http://s546.photobucket.com/albums/hh42 ... CF2816.flv

With you guys showing me the way there'll be no stopping me haha!

USS Atlantis · Post by **USS Atlantis** » Fri Oct 02, 2009 9:56 am

Often wrong Soong wrote: Your wish is my command Jim, here's a video clip for your viewing pleasure

http://s546.photobucket.com/albums/hh42 ... CF2816.flv

With you guys showing me the way there'll be no stopping me haha!

Oh god, what have we unleashed!!

Looks great - keep up the good work