Re: [N8VEM-S100:6514] 7805 Package choices

To: "n8vem...@googlegroups.com" <n8vem...@googlegroups.com>

Subject: Re: [N8VEM-S100:6514] 7805 Package choices

From: "J. Alexander Jacocks" <jjac...@gmail.com>

Date: Wed, 11 Mar 2015 14:14:07 -0400

Authentication-results: gmr-mx.google.com; spf=pass (google.com: domain of jjac...@gmail.com designates 2607:f8b0:400d:c04::229 as permitted sender) smtp.mail=jjac...@gmail.com; dkim=pass head...@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com

Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=wxW7DiXdpw1VAoDsl1XeW2LZXwhGX3S72bnVKTCu0dI=; b=YVck5118g30w/8AOr370WNd1uJyZHO+/2xt/4uMpoE/aHlhBu6NlGs/qGrAp1jhm6A 2Rlj1yl33R0j3VAGdrlo05Fi34U6keMYImtilZPrcPSyZXsefgEt9rbj6qsgBDDnx33n pN8lbxD5VC+C2PVBl2oACVKELomRA2/adUX8UB5QnvmJcNByzszIA0nZk9IQsrRhKnOZ o+Qs/YEqF0cP71XzhmwGrBpjdrdpm3VUlfC66mwDEKEiXV3v7r90llCXqaGnCFxkhm7P KUBLejmowkhMuEmXWDDJlwlCMixJXNkGohmm9ekhu8HCPs8j2jrIbACaoLkr2Dm58yz3 4wjQ==

In-reply-to: <550080EB.90405@gmail.com>

References: <550080EB.90405@gmail.com>

Don,

You might want to consider one of the modern switching regulators, like this:

http://www.mouser.com/ProductDetail/STMicroelectronics/LD1117V50C/?qs=sGAEpiMZZMsGz1a6aV8DcCwRipvt0X3PXDVXWaOVWAU%3d

It's a TO-220, so that might be a concern, but it can output 950ma.

The TI LM2931 device looks to be an option, as well, and has TO-92 packaging, for 5vdc:

http://www.ti.com/lit/ds/symlink/lm2931-n.pdf

Hope this helps!

- Alex

On Wed, Mar 11, 2015 at 1:52 PM, Don Caprio <ilv...@gmail.com> wrote:

Hey brains I have a question.

I'm designing a 5V circuit. Considering the 78L05 (TO-92) and 7805 (TO-220).
The L05 is rated at 100ma while the 05 comes in 1a and 1.5 versions.

Is there anything in between? 100ma is not quite enough while the 7805 is overkill.
Space is a concern so I like the TO-92 package.

If I'm reading the datasheet right for a 7 segment display it draws 25-30ma for each
segment? Thats a current draw of 250ma if all segments are lit. Therefore I may have
to use the 7805/C or change my design to use dual state LED (17-22ma) instead of the 7 segment LED.

--
Don Caprio
ilv...@gmail.com

--
You received this message because you are subscribed to the Google Groups "N8VEM-S100" group.
To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

References:

7805 Package choices
- From: Don Caprio <ilv...@gmail.com>