7810 output voltage spiking?

[Rob]

Well, I am going to take your word on it, so wish me luck (and a smoke-free
experience!) hehe..

Rob

----- Original Message -----
From: "jh." <jhaible at t-online.de>
To: "Rob" <cyborg_0 at iquest.net>; "Synth-DIY list"
<synth-diy at node12b53.a2000.nl>
Sent: Saturday, October 21, 2000 1:00 PM
Subject: Re: 7810 output voltage spiking?


> Some 78xx regulators *do* output a higher voltage
> when there is no output current. Maybe your
> switched regulator doesn't draw current in the first
> milliseconds ? A 1k resistor from 7810 output
> to GND should fix that.
>
> JH.
>
>
>
> -----Ursprüngliche Nachricht-----
> Von: Rob <cyborg_0 at iquest.net>
> An: Synth-DIY list <synth-diy at node12b53.a2000.nl>
> Gesendet: Samstag, 21. Oktober 2000 20:19
> Betreff: 7810 output voltage spiking?
>
>
> I have a problem.
>
> I have a power supply that has a 15 volt input supplying voltage to a
7810,
> then, I take the 10v out from there and put it into an LTC1044A. But, for
> some reason, after being on for about 15 minutes, the LTC1044A dies.
>
> BTW, the 1044 is a switching type regulator.
>
> Now, my question is, could the 7810 be allowing a spike on power-on to get
> past regulation and damage the LTC1044A? I would think it unlikely, but I
am
> wondering if anyone has had such experiences with this sort of thing.
> Changing the LTC1044a merely smokes another LTC1044a.
>
> I am seriously believing its this 7810, but, the 7810 does not seem to be
> out of regulation, on the contrary is is holding a very solid 10 volts
> exactly according to my recently cal'd scope.I have not been able to
capture
> the power on spike either.
>
> What gives?
>
> Rob
>
>
>
>
>