First Lm3886

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#123
Sometimes called dysfunction

Hi
You ask here at DIY and don't take the time to listen and then youve ordered something based on a digikey guys advice and now youve come back here to solve your problem. Hmm... perhaps you should contact the guy at digikey again.
 
#124
Re: Sometimes called dysfunction

infinia said:
Hi
You ask here at DIY and don't take the time to listen and then youve ordered something based on a digikey guys advice and now youve come back here to solve your problem. Hmm... perhaps you should contact the guy at digikey again.
Click to expand...
That's a bit unfair.

I asked for advice. Your advice came too late. Nonetheless, I followed the advice about the single pole fuse. I told the guy at Mouser (not Digikey) exactly what I wanted. He indicated the drawer I needed to buy to meet the advice received on this forum. He recommened the wrong one.

I haven't come back for you to solve the problem. I know what the solution is in this instance.......get the right drawer. I am just reporting back on progress.
 
#125
The part number of the one I want is 4301.1413. This comes with a shorting bar on the neutral. Unfortunately, there doesn't seem to be a UK distributor...or at least I can't find one one Google. Farnell, RS and the usual suspects make a special delivery charge i.e. it's not stocked in the UK.

So, it looks like I'm going to have to buy them from Mouser and, to avoid the £12 delivery charge, I'm gonna have to spend £50.

This is a major bummer.
 
#126
Rather than bleat, I've bitten the bullet and just bought them. To make the order up, I've bought three of the standard filter modules and 5 of the drawers.

I'll use two of the standard filter modules on the power amps and the third on the pre-amp (future project).

The cost of these modules is really ramping up......maybe I can sell the two medical filter modules on ebay to try and recoup some of the costs.
 
#128
I didn't pursue the matter. Unfortunately, instant messenger doesn't provide the concrete evidence that an email does. Ultimately, I made the order. It's my mistake.

I just hope I've got it right this time....or I could end up being the latest UK distributor!
 
#129
PJ, assorted IEC sockets are sold by practically every supplier of electronics gear. Over here, even the crappiest store has a range of a few types.

Do you have any electronics suppliers locally - even basic ones? They're worth using for this sort of hardware, if not the more esoteric stuff.

Stuey
 
#132
Using my guitar amp's schematic as an example, there are "filters" that curtail high frequencies in many places, almost all feedback loops on every op-amp stage. Is that what you meant or did you mean power line local bypass small capacitors (100uF) positioned close to the op-amp chips?
 
#133
AndrewT said:



I believe you are wrong.

That is why I always advise that any and every buffer and amplifier has an RF filter on the input. Without exception.
Click to expand...

i'm referring to power line IEC socket filters.

I agree they are a good idea. I personally use them but they are not strictly needed if you're not concerned with EMI & RFI, for example when building your first simple amp
 
#134
AndrewT said:



I believe you are wrong.

That is why I always advise that any and every buffer and amplifier has an RF filter on the input. Without exception.
Click to expand...
I believe there is a misunderstanding. If the amp circuit itself is build properly with all the rf precautions, then a IEC inlet filter makes imho only a little difference.
AND if the amp circuit is not done properly, the IEC inlet filter won't help very much.
Anyway...I use them, if I have them lying around and if I don't have any, I can live without. 😉
regards
 
#135
Using toroids in the power circuit trades a little DC regulation for little to no mains RF isolation. A better choice is to use a little overrated EI core with a split bobbin. Failing that, then even bigger RFI input filtering is needed and your probably never going to approach the effectiveness of a proper transformer. Twisting wire in cables and proper grounding techniques helps but once RF is inside yor box it's much harder to get rid of.
 
#136
Stuey said:
PJ, assorted IEC sockets are sold by practically every supplier of electronics gear. Over here, even the crappiest store has a range of a few types.

Do you have any electronics suppliers locally - even basic ones? They're worth using for this sort of hardware, if not the more esoteric stuff.

Stuey
Click to expand...
My emergency store is Maplins (within about 10 miles of me). However, these Schurter modules are a little more tricky to source. Even Farnell (who do not usually charge postage) want £15 to deliver these as they are not stocked in the UK.

However, I haven't checked all the suppliers on the list behind pacificblue's link. But I did check every result returned by Google on the part number.
 
#137
I biought this from Farnell and never gave it a thought. I also had some older ones from disused/broken PC PSUs, almost exactly the same, come complete with capacitor across L/N already soldered on as a bonus.

http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1516058

3 pounds 29 pence

Am I missing something else?
 

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#140
Talking about getting carried away, I've been looking at the hookup wire over on Hifi Collective. Gulp. It's not cheap!

I was intending to use my trusty store of Maplin's finest. Will I hear benefits going for something a little more expensive eg the gold plated copper used by Peter Daniel?
 
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