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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by dranobob

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    help with voltage/frequency fluctuations

    I am trying to run a lcd display in the car. the backlight of the screen is obviously being affected by the alternator as as the RPMs change the rolling of the backlight changes. What would be the simplest way to smooth out the power coming in. The screen runs on 12v (safe 10-14v) and at...
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    12v DC to 5v DC 2.5 amps

    thanks! Should have everything in about a week, I'll let everyone know how its goes. I really appreciate everyones help
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    12v DC to 5v DC 2.5 amps

    Here's what I'm ordering. I'm assuming this is all correct. Desc.: Monolithic Radial Lead Capacitors 2.2uF 50volts X5R 10% 5.0mm L/S Desc.: Radial Tantalum Capacitors, Bulk Packaging 6.3V 100uF 10% Desc.: 1/2W 1% Metal Film Resistors 21Kohms 1% 50PPM
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    12v DC to 5v DC 2.5 amps

    okay well i think I can handle the voltage spikes. Alternator spikes generally only happen during heavy load conditions, aka, starting. Well I have a simple solution, a 12v automotive relay. The power supply for the PC has a built in anti-thump feature. PCs at startup have a tendency to...
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    12v DC to 5v DC 2.5 amps

    Page 65, of using this circuit to help regulate the power spikes
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    12v DC to 5v DC 2.5 amps

    so the switching current needs to be equal or higher than the current I need (2.5amps)?
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    12v DC to 5v DC 2.5 amps

    LM2734Z Thin SOT23 1A Load Step-Down DC-DC Regulator shown on page 65
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    12v DC to 5v DC 2.5 amps

    the only problem with this circuit is it says it has a 1a output, I need up to 3a (actually 2.5 give or take)
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    12v DC to 5v DC 2.5 amps

    okay, I'm lost, sorry to ask, but can someone tell what cap I should order, I have been using mouser to order stuff, but any site is fine, cause I'm reading these data sheets, and lost as to what caps I should use for my application I mean or at least help me read the sheet. What is ripple...
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    12v DC to 5v DC 2.5 amps

    k, so to be sure I read correctly, I am using this to power a USB hub using the 12v dc from a car, which of course isn't the cleanest of power sources. I am planning on following the diagram on figure 30, page 18. Or should I do the extra filter (cap/inductors) as shown on page 21?
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    Finding the right relay

    thanks, everyone has been awesome, I can't wait to start soldering, figure 3 or 4 days to get the parts!
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    Finding the right relay

    question can you order small boards to solder the components to? I remember using the bread boards back in college, but I'm looking something about 2" square.
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    Finding the right relay

    considering I can't even get totals over $2 I'm going to build both setups ;) Try em both and see which I like best. Even if they both work perfectly....I used to love to build circuits and been way too long....will be fun
  14. D

    Finding the right relay

    fantastic, that is it. I appreciate the help. What kind/model number transistors should I order (or a single IC with 5 or more transistors), and whats the best place to order in small quantities.
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    Finding the right relay

    1y5zdzjy, it looks to me that your diagram is exactly what I'm trying to do, except I could use the 5v off of the controller instead of using a 7805 to downgrade the 12v (essentially ignoring my statement of having 12v as an external power supply). To make sure I'm understanding. The...
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