As far as i can see, the assembly guide differs from the picture on the packaging. Maybe a technician from Velleman can establish it.
For instance: the J1/J2 positions differ when you compare the print, en the installation guide.
Position of J1/J2 and function of J1/J2 are not related to the problem mentioned above.
Hi!
I’ve bought the k4304 and soldered and checked it completely. Now i can see the same Problem which is named above. (All LED are lid everytime) Is “Short the input = put a connection between input and GND” a solution that works also with low input? Are there other possible sources of error? In addition: when i tap/move the potentiometer sometimes some LED’s are not lightened. But I cant figure out any rule while watching this.
Kind regards,
ben.j.drex
Please check if the leds turn off when you short the input.
Hello again!
Now i have short input and ground. When the potentiometer is turned up completely all LED are lid, when i turn it lower, the LED are flashing in something like a beat, but also when no input is connected. What could be the mistake?
Best regards
ben.j.drex
Very strange.
What power supply are you using?
Can you post SHARP and HI-RES pics of both solder and component side ?
I am Using an 12V DC Adaptor 1A max. I think this is not going to be the problem. Following the pictures of top and backside. Of course, my soldering skills are not that improved, but i hope i will bring this to a good end, just because the LED are flashing already.
http://img205.imageshack.us/i/pict0117u.jpg/
http://img529.imageshack.us/i/pict0121w.jpg/ (you can turn it rightway around with the arrow below)
I hope quality is adequate.
Best regards
Hi,
I have also purchased the same product, same issues as described above. Is there a common solution to all the LED’s coming on on powerup?
I have tried shortin out audio input, LED’s remain lit.
Would appricate any pointers, I had hoped this would be a quick project to complete.
Thanks
sp
To ben.j.dex:
Sorry, but the soldering is very very poor. Most likely, the soldering is at the cause of troubles.
Practise soldering on a spare board, next redo all solderings. Watch for shorts, forgotten solderings, bad solderings etc…
Hi!
I know, my skills are not what someone would call good. I will test and solder everything again. By the way, is there a reason that the manual says “Dont use any flux or grease.” ? Due to heat at the components?
Regards
No, because flux or grease is aggressive and it attacks the copper/parts and/or it causes shorts between tracks.
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
…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
Sorry, no modifications.
Talking about modifications, would it be possible to make the K4304 measure from -15dB to -6dB in steps of 1dB (1db per led)?
Is there an estimation of consumption for k4304?
Max. 250mA, all leds lit.
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?
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…
Tx for the advice and invaluable info!