Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Join
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Miscellaneous Automotive
Car Electronics & Appearance
My rear window defog timer circuit.
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="ShiningBuick" data-source="post: 5341657" data-attributes="member: 578641"><p>Well, my buddy's Acura's timer circuit for his rear window defogger went out. We couldn't find a replacement piece anywhere, and instead of doing it the easy way and just putting in a toggle switch for it, I built him this little guy. It took a bit of engineering, and trial and error before it would work right (because I wasn't using Mosfet, it was hard to get it to stay on long enough).</p><p></p><p>Well anyways, here's what I came up with. It uses a capacitor and resistors to control how quickly the capacitor discharges. When the button is pressed, the capacitor charges up, and as long as it's charged the first transistor turns on. Once that transistor's on, the 2nd one turns on as well, which completes ground to the defogger relay. The time can be controlled by the 1M ohm rheostat.</p><p></p><p>pics:</p><p></p><p><img src="http://i22.photobucket.com/albums/b340/clutch1234/circuitpics.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i22.photobucket.com/albums/b340/clutch1234/circuitboard001.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>(these were before I had added a 2nd transistor and snipped all the leads.. so it's still in build process, but looks almost the same when done, just 2 transistors, lol)</p><p></p><p><img src="http://i22.photobucket.com/albums/b340/clutch1234/circuitboard006.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i22.photobucket.com/albums/b340/clutch1234/circuitboard005.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i22.photobucket.com/albums/b340/clutch1234/circuitboard002.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I'm pretty happy I got it to work, that was an SOB.</p></blockquote><p></p>
[QUOTE="ShiningBuick, post: 5341657, member: 578641"] Well, my buddy's Acura's timer circuit for his rear window defogger went out. We couldn't find a replacement piece anywhere, and instead of doing it the easy way and just putting in a toggle switch for it, I built him this little guy. It took a bit of engineering, and trial and error before it would work right (because I wasn't using Mosfet, it was hard to get it to stay on long enough). Well anyways, here's what I came up with. It uses a capacitor and resistors to control how quickly the capacitor discharges. When the button is pressed, the capacitor charges up, and as long as it's charged the first transistor turns on. Once that transistor's on, the 2nd one turns on as well, which completes ground to the defogger relay. The time can be controlled by the 1M ohm rheostat. pics: [IMG]http://i22.photobucket.com/albums/b340/clutch1234/circuitpics.png[/IMG] [IMG]http://i22.photobucket.com/albums/b340/clutch1234/circuitboard001.jpg[/IMG] (these were before I had added a 2nd transistor and snipped all the leads.. so it's still in build process, but looks almost the same when done, just 2 transistors, lol) [IMG]http://i22.photobucket.com/albums/b340/clutch1234/circuitboard006.jpg[/IMG] [IMG]http://i22.photobucket.com/albums/b340/clutch1234/circuitboard005.jpg[/IMG] [IMG]http://i22.photobucket.com/albums/b340/clutch1234/circuitboard002.jpg[/IMG] I'm pretty happy I got it to work, that was an SOB. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Miscellaneous Automotive
Car Electronics & Appearance
My rear window defog timer circuit.
Top
Menu
Home
Refresh