Parts made in Asia don't have branded logos and usually cost a fraction of
the price for the real ones. So spend some $, and check for quality.
----- Original Message -----
From: "Roman Black" <fastvid@EZY.NET.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, November 04, 2002 2:34 PM
Subject: Re: [EE]:Smoking fresh crowbar experience


> Morgan Olsson wrote:
>
> > The cloud came from the power supply, a DIN rail Comatec 24V 800mA out.
> > Opening it revealed it had popped i4ts 35V output electrolytic.
> > So it had probably been very high output voltage.
> > I found it had no crowbar thingy at all.  Why do I buy crap??.
>
>
> The 3 rules of electronics real estate;
> 1. run test
> 2. run test
> 3. run test
> ;o)
>
> I've seen 1w resistors that when run at 1W got so
> hot the solder melted and they fell out of circuit.
> "3 amp" power supplies that caught fire running at
> 2.5 amps for an hour. And my pet hate are small
> power chips rated for 1A or 1.5A that self destruct
> when run at their so called rated current. Some
> manufacturers are no better than crooks, the worst
> being some of the lesser-known Asian brands using
> other manufacturers datasheet specs but making
> parts nowhere near that good.
>
> I'm still struggling to find good schottky 1N5819
> diodes. So far i've tested 3 brands marked as
> 1N5819, with huge differences between the saturation
> voltage Vf and even differences in the shape of the
> curve.
>
> It's getting nasty, the days of buying a part by
> number and expecting it to perform are long gone...
> :o(
> -Roman
>
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>

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