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Old 29th April 2010, 11:32 PM   #521
troystg is offline troystg  United States
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Quote:
Originally Posted by udailey View Post
Bought one of those laser thermometers. I am sure it will come in handy a lot over the years.
Uriah
Yeah to measure the concrete... :-)


"And it's hotter than concrete
In July in Houston
And it'll get worse here
Before it turns nice"

Lyle Lovett - Flyswatter / Ice Water Blues
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Old 30th April 2010, 12:28 AM   #522
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Yeah guys, IS VERY IMPORTANT to isolate the LM338 from the case by using an spacer and a washer. Or you can just be sure the heatsink is not going to become in contact with anything. I still haven't tested the PSU in real world conditions (I mean with a Lightspeed), but it should get a bit hot, so heatsinking is neccesary for sure.

I am thinking about what to do with the LDR turning on and off matter. Maybe someone has a solution for that?
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Old 30th April 2010, 12:38 AM   #523
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555 timer?
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Old 30th April 2010, 01:36 AM   #524
udailey is offline udailey  United States
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What I was thinking was maybe a 5000uf cap or more on the LDRs after a diode to keep it from dumping backward into the amp. That way the cap supplies a bit of power to the LDRs after the voltage drops to low for the amp to stay on.
Uriah
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Old 30th April 2010, 11:18 AM   #525
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Has anybody ever implemented something with the 555?
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Old 30th April 2010, 12:33 PM   #526
AndrewT is online now AndrewT  Scotland
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see if Forrest Mims booklet is around.
It shows many (28) basic and more sophisticated 555 circuits.
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Old 30th April 2010, 12:58 PM   #527
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So you uriah, propose to put a big cap AFTER the regulator, is that right? What is the maximum/minimum/normal consumption of a Lightspeed? If consumption is too low and we need only 2 or 3 seconds "maybe" 5000uF is too much. But is a matter of experimenting...
The bigger ones I have at hand are 2x 470uF pana FM
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Old 30th April 2010, 01:23 PM   #528
udailey is offline udailey  United States
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Maximum is 40mA at 5V. Minimum and normal arent to far from each other and are probably around 1mA. I use a far different power supply so I dont think testing mine would show what happens. That why I threw 5000uf out there, simply because it wont be expensive for that cap and it will probably last long enough.
Here is a Nichicon Muse of 10,000uf, small size, good price and will most certainly run for a long time after the amp turns off. If you use this you might consider using the protection diodes in the regulator circuit if you use LM338 or 317.
UFW0J103MHD Nichicon Aluminum Electrolytic Capacitors - Leaded
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Old 30th April 2010, 01:32 PM   #529
AndrewT is online now AndrewT  Scotland
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I have a 150mF 6V capacitor.
Maybe I should charge that up and see how long the LDRs remain active?
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Old 30th April 2010, 01:35 PM   #530
udailey is offline udailey  United States
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Thanks AndrewT!
Uriah
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