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Author Topic: Extremly simple 300-500 kHz short duty pulse generator circuit  (Read 2061 times)

Offline dieter

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This circuit is extremly simple and cheap. It uses a standard 555 and a CD4093BE, which is a NAND gate.


The 555 is wired to achieve max speed, this may be above 300 kHz, increasing slightly from 12 to 18 V.
555 needs 6 to 18 VDC.


The signal has a very short low time, which is why, it is simply inverted by the NAND chip. After reducing the current from pin 3 to about 5mA (i think it's 840 Ohm), be feed it into both inputs of the first NAND GATE. Then whenever the signal goes false (low), the condition and output goes true (high), and vice versa, basicly inverting the signal. A NOT gate, without the fuss of dealing with lots of to be adjusted parts. After a Resistor (do not draw too much current from the NAND chip, they blow up easily) I have here an LED, but you could also use this at the base of a transistor, or a Darlington + Power Transistor stage.


Unused Inputs of the CD4093 must be connected with Minus/Ground. They are a bit sensitive, never draw to much current, so a 1kOhm resistor or higher is recommende, before you do something with the signal. The pulse duty is very short, I would guess about 4%.


I thought I share that, since it's so simple.

Free Energy | searching for free energy and discussing free energy


Offline TinselKoala

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #1 on: March 14, 2017, 06:28:42 AM »
Can't you make your photo any larger? I'm having trouble counting the dust particles for my replication.

Resistor looks like 820 ohms, 10 percent.


Offline dieter

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #2 on: March 14, 2017, 06:40:31 AM »
Tinsel, you're welcome. Try to stay within +- 10% of the dust particles, which should work fine. And s for the Spaghetti Sauce splashes, try to substitute with ketchup, if Bolognese is not at hand.


Try to be more optimistic. You can do that!

Offline citfta

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #3 on: March 14, 2017, 11:57:01 AM »
Free Photo Converter allows you  to resize your photos to match the requirements of this forum.  It is very simple and easy to use.


Offline dieter

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #4 on: March 14, 2017, 11:33:27 PM »
Get a grip it's 1.3 MB, and for the first time ever you can actually see every important detail.


Yeah it may blow up the layout. Take it or brake it. If anybody is interested in the circuit, he'll be glad it's so detailed and sharp.


NOTE: forgot to mention: frequently check temperature of the chips (but don't touch the legs). If they're getting real hot, lower input voltage and/or output current. If it's still getting too hot (too hot to touch comfortly), choose an other design with a lower pulse rate, see also "50 555 Circuits" by Colin Mitchell.

Free Energy | searching for free energy and discussing free energy

Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #4 on: March 14, 2017, 11:33:27 PM »
Sponsored links:




Offline TinselKoala

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #5 on: March 15, 2017, 12:04:43 AM »
Sigh. If your chips get too hot it means you are abusing the chips.

And if your posted images are too large physically and too large in terms of file size, it means you are abusing the forum and its members.
« Last Edit: March 15, 2017, 10:34:24 AM by TinselKoala »

Offline dieter

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #6 on: March 15, 2017, 01:10:57 AM »
Yeah, maybe I abused you. But you just violated international copyright. (Berne Convention).


Besides, I abuse you? Not a freaking single thanks, only nitpicking on image size. What a frustrated person are you anyway?


By useing the term "abuse" in such a way, you just marginalized the pain of all those who have been abused truely.


Nevertheless, thanks for resizing the image. Just work on your hobby forum cop behaviour.




Free Energy | searching for free energy and discussing free energy

Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #6 on: March 15, 2017, 01:10:57 AM »
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Offline citfta

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #7 on: March 15, 2017, 01:29:02 AM »
dieter,

I gave you the name of a free photo converter so you can make your photos the proper size before posting them.  Making them the proper
size is showing respect and consideration for others that use this forum.  There is also a forum rule against posting oversize pictures for the
very reason they make it hard to read the thread.  I realize respect and consideration of others is almost totally gone in our modern society
but there are still a few of us around that consider those things still to be important.

Respectfully,
Carroll

Offline dieter

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #8 on: March 15, 2017, 01:51:26 AM »
Still not one "thanks" and you call that respect? You're rude. I maybe haven't known about image size laws, but you're just rude. I was in a good mood, willing to share something, but all I see is ppl peeing on it.


Btw I have photoshop, gimp, artweaver and even paint, but thanks for the lesson.


BTW2 I can't read ANY thread here without scrolling each line horizontally, but do you see me complaining?

Offline dieter

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #9 on: March 15, 2017, 02:11:07 AM »
quote:


[size=8pt !important]Allowed file types: txt, tif, xls, doc, odt, pdf, jpg, jpeg, gif, mp3, mpg, flv, mp4, mpeg, png, rm, ra, rmv, avi, zip, wmv, wma, rar, qt, mov, swf, asf, wm2d, 3gp, 3g2
Restrictions: 12 per post, maximum total size 7000KB, maximum individual size 7000KB



unquote[/font][/size]

Free Energy | searching for free energy and discussing free energy

Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #9 on: March 15, 2017, 02:11:07 AM »
Sponsored links:




Offline citfta

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #10 on: March 15, 2017, 02:42:16 AM »
From the Admin March 3, 2008

Quote
"Hi ALL,
due to bug inside the forum software and the backup problem
with the increasing  attachment size folder ( which is now already 4.5 GigaBytes big)
I have deceided to reduce the file attachment size to
50 Kbytes maximum per file.

This has the advantage, that every picture attachment must be smaller or equal
50 Kbytes, which is okay for e.g. 800x600 JPEG pics at
a good enough compression rate.

Please if you don?t have any freeware image software use
something like
www.Irfanview.com
or
www.Gimpshop.com
or
www.Picasa.com
for your image editing software and then compress your digital pictures
to less than 50 Kbytes before uploading them to over here."
End of quote

If you think asking someone to abide by the forum rules is rude then I am sorry I offended you.  But you have to admit the resized photo TK
posted is much easier to follow than having to scroll back and forth all over the place to try and follow what you posted.  I do know some
others on this forum have posted that they will NOT read a post if they have to scroll back and forth to read it.

I don't have a problem with you as you seem to think.  I actually have enjoyed reading some of your other posts.  I thought I was being
polite to just mention an easy way to resize your photos but apparently you took that suggestion as some kind of criticism when it was not
intended that way.

Again, respectfully,
Carroll

Offline nelsonrochaa

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #11 on: March 15, 2017, 08:54:13 AM »
Sigh. If your chips get too hot it means you are abusing the chips.

And if your posted images are too large physically and too large in terms of file size, it means you are abusing the forum and its members.

Of course you will not be the best person to talk about abuse, because you have already offered several expressions of mockery and sarcasm with many members of this forum as you did a few posts ago.

(Can't you make your photo any larger? I'm having trouble counting the dust particles for my replication)


This is abuse and disrespectful  but you ... could not pass without giving your pinch ... Have things that never change.




Offline TinselKoala

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #12 on: March 15, 2017, 10:37:43 AM »
OK, bye bye then. I've removed my smaller version, so have all the fun you need.

Don't want my help? Then just put me on your ignore list and you'll never have to read my comments again.

Offline dieter

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #13 on: March 15, 2017, 01:50:26 PM »
Carroll, I just didn't know that. And Stefan should update the text in the Posting page. And maybe block or autoscale uploads that are too big, other forums do that too.


As for Tinsel, being on my ignore list since years, I will stop unignoring individual postings, as they just make me defensive against anyone.


kr


Offline pomodoro

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Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #14 on: March 15, 2017, 01:56:01 PM »
TK,  didn't you want the whole world to see your first working 555 circuit in its full glory when you were little?  Colin Mitchell is an Aussie legend, still got his 'Build FM bugs ' series books from the 80s on my shelf. Good to see the old fart hasn't croaked it.

Free Energy | searching for free energy and discussing free energy

Re: Extremly simple 300-500 kHz short duty pulse generator circuit
« Reply #14 on: March 15, 2017, 01:56:01 PM »

 

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