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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Diode/Inductor Frequency Multiplier
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rossics



Joined: Nov 23, 2013
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PostPosted: Thu Dec 26, 2013 5:18 am    Post subject: Diode/Inductor Frequency Multiplier Reply with quote  Mark this post and the followings unread

I came across this schematic, I haven't had much experience with inductors before, and I don't have any in my parts stash ATM to breadboard this out but would something like this be useful in a lunetta?

taken from here: http://www.rlocman.ru/shem/shem-cache.html?di=19481


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analog_backlash



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PostPosted: Thu Dec 26, 2013 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi rossics.

This is a radio frequency (RF) circuit, designed to work in the megahertz region (or above, possibly). I know little about RF circuits, but I know that usually there is a problem with converting an RF circuit to an audio frequency circuit. The inductors need to have impossibly high values for practical use. Normally, inductors come in microhenrys or the low millihenrys, but my guess is that much larger values would be required (if it would work at all at audio frequencies).

If I'm wrong, someone will soon post about it Laughing

Gary
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rossics



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PostPosted: Fri Dec 27, 2013 3:42 am    Post subject: Reply with quote  Mark this post and the followings unread

hey thanks for that, I thought this looked too good to be true,
I found a cmos freq doubler that i might have a play with,
could something like this be wired in series for additional freq doubling?


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PHOBoS



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PostPosted: Fri Dec 27, 2013 7:01 am    Post subject: Reply with quote  Mark this post and the followings unread

To function correctly that circuit needs a 50/50 squarewave which it will turn into a pulsewave with 2x the frequency. If you try to multply that again using
the same circuit you'll probably end up with a very narrow pulsewave with varying pulsewidth. Could be a fun experiment though. (You'll probably need
to use smaller caps on the second multiplier).

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rossics



Joined: Nov 23, 2013
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PostPosted: Sat Dec 28, 2013 6:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Cheers for the help, I'm waiting on a new batch of chips to come in, will report back when its on the breadboard
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analog_backlash



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PostPosted: Sat Dec 28, 2013 9:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I've tried that circuit and it definitely works, but all that PHOBoS said is true. I was thinking of how to widen the pulses again. If you pass them into half a 4013, you get 50:50 out again, but it divides the frequency by 2, which puts you back at square one Sad . You could use a monostable to widen the pulses, but this would have to be varied with frequency or else the "highs" will overlap.

Anyway, good luck trying it out.

Gary
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inlifeindeath



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PostPosted: Thu Jan 02, 2014 1:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

couldn't you resquare the waveforms to 50/50 pw with 2 - 40106 schmitt trigger gates?
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analog_backlash



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PostPosted: Mon Jan 13, 2014 6:27 am    Post subject: Reply with quote  Mark this post and the followings unread

inlifeindeath wrote:
couldn't you resquare the waveforms to 50/50 pw with 2 - 40106 schmitt trigger gates?


I hadn't ignored this, I was just thinking about it for rather a long time Very Happy . The output of the doubler circuit actually gives very wide pulses (i.e. a large duty cycle). The only way that I could think of using 2 40106 gates here, is to use an edge detector (or "half monostable" as it says in the CMOS Coookbook). I've tried this out (see circuit and scope traces below). I've managed to get a 50% duty cycle output, but the circuit still needs to be tweaked every time you change frequency. Am I missing something (I probably am...)?

BTW, the second gate here is optional, as it just re-inverts the signal (which may not be necessary). Also, due to the capacitor having to charge, there is a phase lag between the two waveforms, which gets worse at higher frequencies.

Gary


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DUBmatze



Joined: Feb 18, 2013
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PostPosted: Thu Jan 23, 2014 12:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

the german wikipedia article show this Image (xor):

Posted Image, might have been reduced in size. Click Image to view fullscreen.

the needles shud have the length of the RC-time.
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L´Andratté



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PostPosted: Mon Feb 17, 2014 3:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Seems like I´m in linkposting mood today.
I´ve seen and breadboarded that freq-doubler trick in the Slacktave and it works great!

http://solderman.fatabur.se/Future%20project/Slacktave%20II%20Mod.jpg
http://www.diystompboxes.com/smfforum/forums.html?topic=55644.0
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