| Home | Terms of Use | Site Map | Contact Us |
IndustryCommunity.com > Electrical and Electronic Community > Analog Circuit Design Forum > Message
Main Menu

[ List Subjects ][ Post Message ]
[ View Followups ][ Post Followup ]

Subject: Re: Designing current source?

Date: 10/26/03 at 5:19 PM
Posted by: Russ Kincaid
E-mail: russlk-nospam[AT55]yahoo.com (replace [AT55] with @ to reply)
Message Posted:

In Reply to: Re: Designing current source? posted by Ben Blonder on 10/26/03 at 9:38 AM:

An LED drops between 1.5 and 3 volts, depending on color. The only way (other than an active circuit) that the array can operate on 9 volts is if there are resistors in series with each LED, in which case the array will be very tolerant of supply voltage changes.

A switching power supply will save power. Your best bet is to buy a ready-made supply because if you are not experienced in power supply design it is unlikely that you will be able to design and build one. The problem is that finding a 14.4 volt to 9 volt supply is next to impossible. If you want to try building one, look up Texas Instruments application notes and National Semiconductor application notes.

Follow Ups:

Post a Follow-up:


Message to Post:


1999-2001 Sunlit Technology Co., Ltd. All rights reserved.