Comments on: Parts: LM317 adjustable voltage regulator

By: sam

sam — Fri, 06 Mar 2009 04:50:40 +0000

Is there anyone knows the circuit for the variable speed motor controller having 90VDC, 1/30HP motor. I need a controller for this motor. I already made for 24VDC motor but I need now is for 90VDC variable speed controller. Thanks.

By: brakes

brakes — Tue, 02 Dec 2008 10:48:31 +0000

wow! good to start with.
There are few parameters to find out, such as: output ripple, frequency response, questient current, how to switch it off, and the price..

By: therian

therian — Wed, 24 Sep 2008 07:26:23 +0000

Class-D digital amp(remember enthusiast trying to get sound from early apple ?, same thing just faster speed), it just so terrible idea. Power efficient – Yes, will ewer produce something better then beeeep – No

By: DB

DB — Wed, 24 Sep 2008 03:27:45 +0000

That’s a blast from the past. I was using LM317s in kludged circuits in the mid 1970s.

By: jimmys

jimmys — Tue, 23 Sep 2008 22:12:13 +0000

I’ll add zetex to the list for a low quiescent current (0.6ma) 3.3v regulator:

http://www.zetex.com/3.0/product_portfolio.asp?pno=ZSR330

several other voltages are also available.

By: carlton

carlton — Tue, 23 Sep 2008 12:36:45 +0000

@therian: actually, almost all audio consumer applications use switchers, the ubiquitious class-D amp. switchers are also widely used in radios, due to the eventual lower cost, at a significant power level. so-called audiophiles shie away from switchers, but it’s usually due to a lack of comprehension about how to properly design and filter them, rather than an inherent advantage in other types (such as class-a/ab). there are very high-class, audiophile-grade equipment which properly use class-D amps.

By: Ian Lesnet

Ian Lesnet — Tue, 23 Sep 2008 11:22:35 +0000

@dino – thanks for the link.

The ld1117v33 is a 3.3volt low drop out regulator. Here’s a cheap one from Mouser.com:
http://www.mouser.com/Search/ProductDetail.aspx?qs=arR7071FstdSYX%2fAthFGRA%3d%3d

By: Ian Lesnet

Ian Lesnet — Tue, 23 Sep 2008 11:18:07 +0000

We’ll be happy to take requests for Monday parts posts in the comments.

Last week we looked at tactile switches:
http://hackaday.com/2008/09/15/tact-switches-for-your-next-project/

By: dink3r

dink3r — Tue, 23 Sep 2008 09:32:37 +0000

i’d like to see more of this kind of posts!!! reminds me of the good ol’ days back in tech school… keep em coming…

By: follower

follower — Tue, 23 Sep 2008 08:09:26 +0000

These notes I’ve made about powering circuits and the UCC283 range of LDO voltage regulators might be of interest:

http://code.rancidbacon.com/LearningHowToPowerCircuits

http://code.rancidbacon.com/LearningAboutUCC283

–Phil.

By: dino

dino — Tue, 23 Sep 2008 06:06:54 +0000

The LD1117V33 is a linear 3.3V regulator available in a friendly TO-220 package. Cheap and easy to use, just like the trusty 7805 (just add two caps).

http://octopart.com/search?q=ld1117v33

By: Ian Lesnet

Ian Lesnet — Tue, 23 Sep 2008 05:50:09 +0000

@Farles

I don’t know of a simple 3.3 volt linear regulator, something like a “7803.3″, so I use the LM317. There are several 3.3 volt (and 3.3/2.8 dual supply) LDO (low drop out) voltage regulators.

By: therian

therian — Tue, 23 Sep 2008 05:47:06 +0000

classic 7805 can be used as an adjustable voltage regulator too, just dont connect middle pin directly to ground, I believe datasheet have right schematic for such configuration.

yes linear are power wasting regulators but if you building audio or radio you dont want additional noise

By: Daniel

Daniel — Tue, 23 Sep 2008 05:28:31 +0000

This was not hackaday worthy post, very off theme… bring a project instead next time.

By: Hrpuffnstuffatgmaildotcom

Hrpuffnstuffatgmaildotcom — Tue, 23 Sep 2008 05:19:48 +0000

@ pwned88 – I use these switchers myself in battery powered stuff

http://www.dimensionengineering.com/DE-SW050.htm

http://www.dimensionengineering.com/DE-SW033.htm

http://www.dimensionengineering.com/DE-SWADJ.htm

They replace the linear regulator and work well.