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From: Lizard Blizzard
Subject: Re: V regulator input cap size?
Date: Tue, 22 Oct 2002 12:46:12 -0700
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Frank Bemelman wrote:
> "DaveC" schreef in bericht
>>On Tue, 22 Oct 2002 8:10:08 -0700, Lizard Blizzard wrote
>>(in message ):
>>Circuit current requirements:
>> 555s: 10mA each x2
>> 4020: 1mA max including output drive current
>> LEDs: 15mA each x2
>> Relay coil: 25mA (I was a bit off on this figure!!)
>>Supply voltage measures at 28vac rms. (for some reason it's running lower
>>than normal for HVAC) which will give ~ 37vdc(?). The max input for the
> The easiest way is a 7824 followed by 7812. Both should be
> on a heatsink, you can use a single heatsink for this.
I searched National's web site and they didn't have a 7824. But
assuming that the 7824 has the same 35V maximum limit on input voltage,
he would still have the same problem, the unreg'd voltage would still
exceed its limits.
> Frank Bemelman
> (remove 'x' & .invalid when sending email)
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