September 2000
Beginner
152 pages
8h 26m
English
Content preview from Mims Circuit Scrapbook V.I.
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Five
Power Sources
1. Miniature DC–DC Converter
The LM3909 was originally designed as an LED flasher, but has many other applications. One that I’ve enjoyed experimenting with is a miniature power supply that allows a tiny watch battery to power a neon lamp or even a powerful semiconductor-laser pulser. Both these applications require 70 to 150 volts at relatively low current.
Figure A shows the circuit of the LM3909 dc-dc converter. In operation, the LM3909 rapidly switches Q1 on and off at a rate determined by C1. The transistor can be considered a switch in series with choke L1 and resistor R2. Each time Q1 switches off, the magnetic field set up by the current flowing through L1 collapses and induces a high voltage across the inductor. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.