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