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Old 17th December 2003, 11:42 PM   #11
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Default Re: use car-light bulbs for load

Quote:
Originally posted by dutch diy
pcb for a regulated powersupply is available on my site amp
The PCB I am designing is for another circuit. Take a look at the first post .

Quote:
Originally posted by dutch diy
A decent load to test a PSU can be made out of car-head-light bulbs.
They are usually 12V 50W so two in series makes a bright 24V 50W load.
Thanks for the tip!
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Old 18th December 2003, 09:42 AM   #12
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Ok, everything's looking good on the PCB, I guess I'll make it today. I only need to put the screws a little bit farther from the 2 MJ15003's.

Oh, I was wondering. How do I connect something to the collector of the MJ15003? There's no pin for it, it's just the case. Do I need some kind of bar to stick trough the PCB and solder it to the underside & the case?

Or am I totally wrong asuming that these MJ15003's don't need cooling in this case?
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Old 18th December 2003, 10:11 AM   #13
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Quote:
Or am I totally wrong asuming that these MJ15003's don't need cooling in this case?
Yes you are

These BJTs pass the whole current delivered to the amp, so they must be heatsinked.

Cheers

Andrea
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Old 18th December 2003, 10:18 AM   #14
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Hi Devil_H@ck,

Quote:
Oh, I was wondering. How do I connect something to the collector of the MJ15003? There's no pin for it, it's just the case. Do I need some kind of bar to stick trough the PCB and solder it to the underside & the case?

You can get solder tags that have an eye for a 3mm screw. Use two nuts, one to mount the transistor and the second to sandwich the tag. Then solder your wire to the tag.
Good luck and nice pcb BTW
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Old 18th December 2003, 10:31 AM   #15
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To reply your question - one of the mounting screws for a TO3 pack should make contact with the case of the semiconductor BUT NOT the heatsink. An eyelet passing through this screw can be used on the track side of the PCB to complete the electrical connection. The transistor itself should be isolated electrically from the heatsink. Check the photographs of various projects in this forum to get an idea.
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Old 18th December 2003, 02:20 PM   #16
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Quote:
Originally posted by Luke
You can get solder tags that have an eye for a 3mm screw. Use two nuts, one to mount the transistor and the second to sandwich the tag. Then solder your wire to the tag.
Good luck and nice pcb BTW
Quote:
Originally posted by Samuel Jayaraj
To reply your question - one of the mounting screws for a TO3 pack should make contact with the case of the semiconductor BUT NOT the heatsink. An eyelet passing through this screw can be used on the track side of the PCB to complete the electrical connection. The transistor itself should be isolated electrically from the heatsink. Check the photographs of various projects in this forum to get an idea.
Thanks for the tips!
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Old 18th December 2003, 07:00 PM   #17
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Typical . I can't find my cutting disks, great... That, and both my 0.8mm are broken. Oh well, I'll buy some tomorrow .
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Old 18th December 2003, 10:11 PM   #18
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Default Wohoo!

Great! Guess what I found behind a pile of women's magazines . Cutting discs!

This is the best PCB I've ever made (ok, it's only the 3rd I did, so what ). Even the sides are straight, well, except for the two I had to cut with the dremel . You can even read the tiny words I put on it: "AVH '03" (= Anthony Van Herrewege 2003) and "JLH PS" (= JLH Power Supply). Well, my name is not that readable, but that's because that part of the PCB was between 2 UV lamps and the part with the "JLH PS" was right above one.

Here's the PCB:
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File Type: jpg power supply - pcb.jpg (21.5 KB, 757 views)
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Old 18th December 2003, 10:17 PM   #19
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Default Re: Wohoo!

Quote:
Originally posted by Devil_H@ck
Great! Guess what I found behind a pile of women's magazines .
what do you have those magazines for?

Quote:
Originally posted by Devil_H@ck
Cutting discs!
Here's the PCB:

Nice PCB. How do those cutting discs work?
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Old 18th December 2003, 10:29 PM   #20
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Default TO-3 insulation

Quote:
Originally posted by Devil_H@ck
Oh, I was wondering. How do I connect something to the collector of the MJ15003? There's no pin for it, it's just the case. Do I need some kind of bar to stick trough the PCB and solder it to the underside & the case?
Of the shelf "isolation-sets for TO-3" contain pads, nuts & bolts soldering-eye and plastic washers to securly tighten your TO-3 to the case and leaving a soldering eye to connect from the bottom to the housing of the device.
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