It is currently Sat Feb 25, 2017 12:19 am

All times are UTC




Post new topic Reply to topic  [ 44 posts ]  Go to page Previous  1, 2, 3
Author Message
 Post subject: Re: k4304 vu-meter
PostPosted: Thu Aug 12, 2010 2:38 pm 
Offline
User avatar
Velleman Support
Velleman Support

Joined: Fri Dec 08, 2006 8:07 am
Posts: 7733
Location: Belgium
No, because flux or grease is aggressive and it attacks the copper/parts and/or it causes shorts between tracks.


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Mon Feb 07, 2011 3:50 pm 
Offline
Member
Member

Joined: Sun Dec 06, 2009 9:29 am
Posts: 37
Hi,

I have a special radio-like receiver, which the user must tune to the receiving signal, so that the amplitude of the signal becomes minimum: for this reason, the signal is output to an earphone for better discrimination of the point of 'minimum'.

In order to be able to more accurately spot the point of minimum, I was thinking to 'visualize' the earphone output, so that I would be able to 'see' the point of minimal output, instead of listening to it.

For this visualization (not interested in actually measuring the audio output amplitude), should I go for the K4304 kit, or the K4307 kit?

regards
lazzy


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Mon Feb 07, 2011 4:29 pm 
Offline
Member
Member

Joined: Sun Dec 06, 2009 9:29 am
Posts: 37
...and, having mentioned my particular application for K4304/K4307, what I could add/modify to the components of the kit (for example, K4304), so that it becomes more sensitive, that is, it reacts faster and more detailed to tiny deflections from the 'minimum' state?

(minimization of the signal occurs through a potentiometer - this potentiometer is not to be confused with the audio volume adjuster; the former interacts with the received signal until it minimizes it, while the latter only adjusts output audio level for comfortable listening)

looking forward to your reply
lazzy


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Mon Feb 14, 2011 7:57 am 
Offline
User avatar
Velleman Support
Velleman Support

Joined: Fri Dec 08, 2006 8:07 am
Posts: 7733
Location: Belgium
Sorry, no modifications.


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Tue Feb 15, 2011 3:08 pm 
Offline
Member
Member

Joined: Sun Dec 06, 2009 9:29 am
Posts: 37
Talking about modifications, would it be possible to make the K4304 measure from -15dB to -6dB in steps of 1dB (1db per led)?


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Tue Jan 17, 2012 12:46 pm 
Offline
Member
Member

Joined: Sun Dec 06, 2009 9:29 am
Posts: 37
Is there an estimation of consumption for k4304?


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Tue Jan 17, 2012 1:05 pm 
Offline
User avatar
Velleman Support
Velleman Support

Joined: Fri Dec 08, 2006 8:07 am
Posts: 7733
Location: Belgium
Max. 250mA, all leds lit.


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Tue Jan 17, 2012 2:00 pm 
Offline
Member
Member

Joined: Sun Dec 06, 2009 9:29 am
Posts: 37
Tx for the info. For how many hours would it be possible to run the meter on a 12v 2000-2500mAh alkaline battery pack? And on a 12v lithium disk (cr2032) pack?


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Tue Jan 17, 2012 6:30 pm 
Offline
Senior Member
Senior Member

Joined: Sat Feb 10, 2007 5:50 pm
Posts: 628
Location: Sint-Niklaas
Minimal 6 hours (all leds on) on the alkaline batteries and unpredictable with CR2032: these batteries can't deliver 250 mA... If they could, it would be for 39 minutes...


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Wed Jan 18, 2012 12:57 pm 
Offline
Member
Member

Joined: Sun Dec 06, 2009 9:29 am
Posts: 37
Tx for the advice and invaluable info!


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Wed Jan 18, 2012 1:43 pm 
Offline
Senior Member
Senior Member

Joined: Sat Feb 10, 2007 5:50 pm
Posts: 628
Location: Sint-Niklaas
No problem!


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Fri Jan 20, 2012 10:50 am 
Offline
Member
Member

Joined: Sun Dec 06, 2009 9:29 am
Posts: 37
Could the output of K4304 be fed to an analogue vu display (needle), instead to the led's?


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Fri Jan 20, 2012 11:11 am 
Offline
User avatar
Velleman Support
Velleman Support

Joined: Fri Dec 08, 2006 8:07 am
Posts: 7733
Location: Belgium
Sorry, the K4304 has no output.


Top
 Profile  
 
 Post subject: Re: k4304 vu-meter
PostPosted: Fri Feb 17, 2017 8:59 am 
Offline
Member
Member

Joined: Fri Feb 17, 2017 8:33 am
Posts: 1
some time ago I had buyed the same kit.
last week I want it to mount it and I did .
I had checked 3 times all the soldering and contacts , and also the parts ....all seems to be ok , but is malfunction .

When i feed with power ( 12V constant ) , all leds are lightup / burning

1. if I short input ( gnd + low or high ) = nothing is happening
2. If i take out the long CI , leds goes off
3. ZD1 and D3 are in place ( not switched )
4. J1/J2 are closed


any suggestion ?

http://i88.photobucket.com/albums/k197/ ... jyyts0.jpg

http://i88.photobucket.com/albums/k197/ ... djowlb.jpg


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 44 posts ]  Go to page Previous  1, 2, 3

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group