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Forum Index : Electronics : Wind/Solar controller based on TL084 op a

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Old Man

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Joined: 18/09/2009
Location: United States
Posts: 4

Posted: 01:15am 18 Sep 2009

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Can anyone help me find out more about the 78L08 voltage regulator used on this controller. I have every thing else soldered on the board but this regulator. When I look at the datasheet for the 78L08 regulator it looks just like an ordinary transistor but in the photo of the finished controller it looks like a regulator that a heat sink can be used on? What other regulators can I use if any? This controller is on BackShed .com. Thanks for any help you can give me. Jim

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Dinges
Senior Member

Joined: 04/01/2008
Location: Albania
Posts: 510

Posted: 05:58am 18 Sep 2009

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There's a difference between the 78L08 and the 7808; the 7808 has a TO220 case, with a metal tab with hole for bolting to a heatsink; the 78L08 is the low-power version of the 7808, in a smaller case (TO92) such as small-signal transistors as the BC547 or 2N3904. (this information should be in the datasheet too)

For proper orientation when installing the 78L08, keep in mind that the flat side of the 78L08 is equivalent to the metal tab of the 7808; I always have to stay alert to this when using them, because I somehow have the natural inclination to install the 78Lxx reversed. And then they won't work....

Just checked ( http://www.thebackshed.com/windmill/articles/TL084-Controlle r.asp); Glenn used a 7808 when building his; that's fine, a 7808 (1A version) can replace a 78L08 (100mA version); the reverse is not the case. So you're free to choose: 7808 or 78L08. Your choice.

Peter. (<-- turning into an old man, one day at a time)

Old Man

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Joined: 18/09/2009
Location: United States
Posts: 4

Posted: 10:38am 18 Sep 2009

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Thanks a lot for the information it's just what I needed to know. I'm new to this electronic stuff and every bit of information helps a lot. Thanks again. Jim

old and stupid

Old Man

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Joined: 18/09/2009
Location: United States
Posts: 4

Posted: 11:05am 18 Sep 2009

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Is there any way to use a 7812 1amp 12VDC regulator or maybe a LM294oct on this controller located on thebackshed web site? Am I right in thinking the 7812 is 12volt output, the 294 is 5volt and the 7808 is 8 volt output?http://www.thebackshed.com/windmill/articles/TL084-Controlle r.asp); Thanks JimEdited by Old Man 2009-09-19

old and stupid

Tinker

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Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 02:28pm 18 Sep 2009

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Old Man said Is there any way to use a 7812 1amp 12VDC regulator or maybe a LM294oct on this controller located on thebackshed web site? Am I right in thinking the 7812 is 12volt output, the 294 is 5volt and the 7808 is 8 volt output?http://www.thebackshed.com/windmill/articles/TL084-Controlle r.asp); Thanks Jim

A little secret for you Jim, just type the device number (LM294) in the google window and hit the search button. You will get a link to data sheets that tell you exactly what the device does.
Some sites want you to sign up or charge for data sheets but I found there are free ones too, just browse through the google 'hits'

Klaus

Old Man

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Joined: 18/09/2009
Location: United States
Posts: 4

Posted: 01:07am 27 Sep 2009

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Thanks Peter and Klaus. I just got my 7808 in the mail and installed it and everything worked Great. I saw a post Glen had earlier and he seemed to be having trouble setting the kick in and out on the relay (without a varitable power supply) thankfully I have one I built last winter and setting the kick in and out worked really good. I'm still not very good at understanding the data sheets (knowing what component can be substituded for another component) but I'll have all winter to work on this ha ha . I looked the schematic over and could see where the 78L08 flat face would face (what is to me) the other direction than the 7808, a good think to keep in mind. I might pick up a little of this stuff if I live to be about 100 but it is very interesting trying. Thanks again Jim

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Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5036

Posted: 02:04am 27 Sep 2009

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Hi Jim

Good to hear you got it running, and I'm sure you learned a lot in the process. Well done.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 04:07pm 27 Sep 2009

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Hi Jim,
I play a lot in electronics and one of my favorite places for free data sheets is Datasheet.com

http://www.datasheetcatalog.com/

There is not to many components i cant find information on there.
And its Free.

No such thing as "old and stupid" just old and still learning.

You got to love it when things work!

Pete.

Sometimes it just works

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