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From: Spehro Pefhany
Subject: Re: Flash a string of LEDs
References: <firstname.lastname@example.org> <email@example.com>
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Date: Thu, 05 Dec 2002 15:07:01 GMT
NNTP-Posting-Date: Thu, 05 Dec 2002 10:07:01 EST
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.
"it's the network..." "The Journey is the reward"
firstname.lastname@example.org Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.co
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