[Weather] [personal] Re: Tini question

[Dave McGuire]

   Vf == 0.7V (which applies *only* to "ordinary" silicon diodes by  
the way) is a common rule of thumb, but it is by no means a  
constant.  That trick will certainly work, though.

                  -Dave

On Nov 28, 2006, at 2:54 PM, Jim Pace wrote:
>  How about a couple diodes in series with the 6 volts=4.8 volts?
> Jim
> http://ecapmiill.home.comcast.net
> ----- Original Message -----
> From: "Dave McGuire" <mcguire at neurotica.com>
> To: "List for 1 Wire Weather Stations and devices" <weather at buoy.com>
> Sent: Tuesday, November 28, 2006 11:20 AM
> Subject: [personal] Re: [Weather] Tini question
>
>
>> On Nov 28, 2006, at 1:36 PM, Tim Sailer wrote:
>>>>> I'm in the process of dusting off the old TINIs I have for a
>>>>> solar heat (hot air) project I'm going to start playing with,
>>>>> since it's getting cooler around here. It's been quite a few
>>>>> years since I've touched them. I know they take 5vdc, but I was
>>>>> windering what would happen if I supplied 6vdc from a golf-cart
>>>>> battery? Would I have to regulate this down to 5v to avoid damage?
>>>>
>>>>    Yes, you'll need to provide 5V.  Also, if you're starting from
>>>> only 6V, you'll need an LDO (low-dropout) regulator, such as the
>>>> LM2940...the dropout voltage on the common 78xx-series  
>>>> regulators is
>>>> nominally 2V.
>>>
>>> Hmm. Sounds like I'm better off slapping one of those PicoATX dc/dc
>>> power supplied on 2 batteries, and pulling off the 5v regulated
>>> off that.
>>
>>   Ugh, that really sounds like overkill to me, both in terms of
>> capabilities and cost.  Send me a non-PO-box shipping address in
>> private mail and I'll "hook you up", so to speak.
>>
>>                -Dave
>>
>> -- 
>> Dave McGuire
>> Cape Coral, FL
>>
>>
>>
>>
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-- 
Dave McGuire
Cape Coral, FL