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Gb: F5 Pcb

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cviller

cviller

Member
Joined 2005
Hi guys - I have been really busy with moving arrangements, so I have not been able to send the last orders before now. If you have ordered, you'll receive a confirmation when I have sent your boards.
I have also closed down the order site. I hope I will be able to supply boards again when I get home, but I am not sure I will have time to do the packing - I'll figure out something. :D
 
Tripmaster

Tripmaster

Member
Joined 2008
A quick question please.

Are the holes directly under the LED position used to attach a diode to prevent reverse voltage? I normally solder the diode to the legs of the LED but it will be much neater if I can solder it on the board.

Led-1.jpg


Thanks
 
Tripmaster

Tripmaster

Member
Joined 2008
cviller said:
Answered by mail also. Sure you can solder the LED directly to the board. The reason for two symbols is because you might prefer to use either - they are in parallel.
Click to expand...

Hi

No, the LED will be mounted on the front panel. Can I solder a diode under the LED solder pads to prevent reverse voltages? (I cant see any reason not too)

I have only ever used a diode on LEDs when adding a separate winding on a transformer. Are they required if I am supplying the LED with DC rather than AC?
 
Last edited:
Renron

Renron

Member
Joined 2007
Tripmaster said:
Hi Ron

Possibly the wrong choice of words in no particular order ;)

In the past I have created a low voltage AC supply by adding a separate winding around a toroidal transformer. I guess I should have said the diode wired in parallel with the LED creates a simple half wave rectifier! :)

LED2.jpg
Click to expand...

Yes Andrew,
I too knew that a diode could be used in that configuration. However, not all of us are as knowledgeable as you (I'm not anywhere close) and I'm sure someone who just happened to read the above A/C reference would try it on a LED. (No Sarcasm intended)
We need to think of everyone who might read our posts and their experience level. Which is why we repeat ourselves on the Grounding / Neutral differences.
It was not all that long ago I was a total newbie and didn't know LEDs were D/C only. I've lost the total part but I'm still a newbie. :)

Thanks for the pic and explanation Tripmaster. How do you know how many windings to put on the torrid? Ratio based? Trial and Error?

Ron
 
Tripmaster

Tripmaster

Member
Joined 2008
Renron said:
Yes Andrew,
I too knew that a diode could be used in that configuration. However, not all of us are as knowledgeable as you (I'm not anywhere close) and I'm sure someone who just happened to read the above A/C reference would try it on a LED. (No Sarcasm intended)
We need to think of everyone who might read our posts and their experience level. Which is why we repeat ourselves on the Grounding / Neutral differences.
It was not all that long ago I was a total newbie and didn't know LEDs were D/C only. I've lost the total part but I'm still a newbie. :)

Thanks for the pic and explanation Tripmaster. How do you know how many windings to put on the torrid? Ratio based? Trial and Error?

Ron
Click to expand...

Hi Ron

It was trial and error. The number of turns required for the desired voltage will depend on the size of the transformer. I think I'll just tap off of the PCBs , but as the transformer is at the front of the case it may look neater in terms of cable length.
 
cviller

cviller

Member
Joined 2005
I have gotten a few mails about availability of my boards and I'll answer here to everyone. I am currently in the process of moving back to Denmark and most of my stuff including boards have been shipped by sea, so I'll only get them back in the middle of August. At that time I'll be able to sell the remaining boards.
 
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