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Reply-To: "fred bartoli"
From: "fred bartoli"
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
Subject: Re: Flash a string of LEDs
Date: Thu, 5 Dec 2002 18:17:53 +0100
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NNTP-Posting-Date: 05 Dec 2002 18:14:53 MET
Spehro Pefhany a écrit dans le message :
> On Thu, 5 Dec 2002 11:13:32 +0100, the renowned "fred bartoli"
> >Ok, that's it. I've set the cap to 220 uF. It also refuse to start and
> >instead gently settle to the DC bias point I obtain without using the UIC
> >Now build an AC analysis to measure the circuit loop gain (there was a
> >recent thread about this but I can't remember what it was). Then vary the
> >cap and see what happens to your loop gain.
> This kind of circuit can fail to operate if Vcc is too clean.
> In PUT oscillators we got a substantial reduction over data sheet
> peak trigger currents because of 60Hz ripple on the supply. In this
> case also, the supply is derived from AC. A bit of ripple (tens of mV)
> on the supply in your simulation might help it to trigger.
Hmm, I really don't see why. Do you have some hints ?
> Best regards,
> Spehro Pefhany
> "it's the network..." "The Journey is the reward"
> email@example.com Info for manufacturers:
> Embedded software/hardware/analog Info for designers:
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