RE: Electronics Question...

["Shane Harrison" <shane.harrison@xxxxxxx>]

Hi Ian,

Well done Frank !

However I would still strongly recommend solving your 4.75V output
problem otherwise I suspect you will have downstream problems at some
point.

Cheers
Shane

> -----Original Message-----
> From: Ian Lowe [mailto:ian@xxxxxxx] 
> Sent: Saturday, 28 December 2002 2:57 a.m.
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Electronics Question...
> 
> 
> *ahem* and the prize goes to Frank..
> 
> "yeah, of course my circuit has decoupling caps on the PIC"
errr..
> 
> add a decoupling cap, and all is well, regardless of power issues!
> 
> Ian.
> 
> -----Original Message-----
> From: Ian Lowe [mailto:ian@xxxxxxx]
> Sent: 27 December 2002 10:38
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Electronics Question...
> 
> 
> Yep Dave,
> Thanks for the pointers (and thanks to all of the people who mailed
me
> directly!)
> 
> The circuit is an interface for controlling the K400 Curtain 
> controller, and the problem seems to be twofold:
> 
> My PCB is missing two caps around the voltage regulator, and 
> the regulator itself is simply not powerful enough.
> 
> I'm off to craplins in a mo... wish me luck!
> 
> I.
> 
> 
> -----Original Message-----
> From: Dave McLaughlin [mailto:dave@xxxxxxx]
> Sent: 27 December 2002 10:29
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Electronics Question...
> 
> 
> Hi Ian,
> 
> What other devices are in your design? The 78L05 is only 
> capable of supplying 100mA max current and above this the 
> voltage starts to drop as it heats up.
> 
> I normally see this when using a few LED's in the circuit but 
> not knowing your design it does not help. There is a higher 
> rated device in the same package available from the likes of 
> Farnell and RS but I can't remember off hand what the part 
> number is. If you need it give me a shout and I'll look it up.
> 
> Regards
> Dave...
> 
> -----Original Message-----
> From: Ian Lowe [mailto:ian@xxxxxxx]
> Sent: 26 December 2002 18:55
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Electronics Question...
> 
> 
> 
> Been debugging one of the wackiest problems I have ever seen 
> over the festivities, where writing a value to EEPROM failed 
> (although the rest of the circuit worked perfectly) After 
> some helpful souls trying the code out for me, I figured out 
> that the problem was power related. :
> 
> I'm using a 78L05 to derive a 5V supply from a 12V feed, and 
> only getting 4.7 Volts (!!) which is great, right up until 
> the PIC tries to do something juice intensive, at which 
> point, it fails..
> 
> I have tried dropping a 220u cap across the 5v-0v feed, 
> thinking that would give a little reserve for intensive ops, 
> but no joy..
> 
> I don't want to bore the bits off of the list at large, so 
> can anyone who wouldn't mind giving a point in the right 
> direction drop me a mail?
> 
> Ta muchly, and I hope that yesterday's dinner has largely 
> settled by now ;)
> 
> Ian.
> 
> ---
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> 
> 
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