Search found 45 matches

by solar3000
Thu Jan 18, 2018 7:43 pm
Forum: General Discussion
Topic: Hammond die cast al case, heat sink?
Replies: 11
Views: 3699

Re: Hammond die cast al case, heat sink?

thanks. I dremeled it shiny. Definitely not as silvery as Al in heatsinks. But plenty of surface area for a single transistor.

looks like compressed particle aluminum. Like compressed wood.
by solar3000
Sun Jan 14, 2018 4:20 pm
Forum: General Discussion
Topic: Hammond die cast al case, heat sink?
Replies: 11
Views: 3699

Re: Hammond die cast al case, heat sink?

So, it sounds like you're saying the quality of aluminum is ok compared to the type of aluminum in a typical heat sink. I have no way to test the thermal conductivity of the aluminum, so ditto jwax. But I doubt Hammond purposely concocted thermo-insulating aluminum to make their boxes. I do believe...
by solar3000
Sat Jan 13, 2018 8:12 pm
Forum: General Discussion
Topic: Hammond die cast al case, heat sink?
Replies: 11
Views: 3699

Re: Hammond die cast al case, heat sink?

So, it sounds like you're saying the quality of aluminum is ok compared to the type of aluminum in a typical heat sink.
by solar3000
Sat Jan 13, 2018 4:54 pm
Forum: General Discussion
Topic: Hammond die cast al case, heat sink?
Replies: 11
Views: 3699

Hammond die cast al case, heat sink?

I have various Hammond cases.

It says die cast aluminum. But it feels like low grade aluminum. Looks like compressed wood. Well see for yourself and some of you already have ones.

Would it be a good heat sink?

https://www.hammfg.com/electronics/smal ... t/1590.pdf
by solar3000
Fri Jan 05, 2018 5:12 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

These just came in a hour ago.

https://www.amazon.com/gp/product/B00K8 ... UTF8&psc=1

Works great. No more hot capacitors.
by solar3000
Fri Jan 05, 2018 6:48 am
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

yah. No more heat. The chip is just somewhat warm. So, now it does not drop voltage up to 1.5 amps at a setting of 12 volts. With 2 amps, the voltage drops to 9 volts. So, here I go again. Next step is to make a copper board or at least try a pre-made one like those from the dead Radio Shack. I'm su...
by solar3000
Thu Jan 04, 2018 11:00 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

Uhhh..huh-huh...problem solved. same circuit. I connected a 20W halogen bi-pin lamp one end to the ground (anywhere) and then the other pin directly to the output, even at the heat sink tab. The bulb lit up and didn't drop a tenth of a volt. The real problem is that shiitie solderless board that I p...
by solar3000
Thu Jan 04, 2018 7:49 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

If you measures 34V peak to peak, it would be 24VRMS (34*0.707) 120Hz is expected but says nothing about the current you are sourcing from the transformer. your probablem may not be voltage, it acts like you are running short of current. So if the transformer is 5A ish then maybe the diodes or filt...
by solar3000
Wed Jan 03, 2018 11:23 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

OK so did the suggested measurements. Just to humour myself, I measured the bare transformer at 60 Hz. I measured at the point after the rectifier and mister meter says 120 Hz. The bare transformer measures voltages like this: CT is 16 volts. Entire secondary is 34 volts. So would you say this is a ...
by solar3000
Wed Jan 03, 2018 4:41 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

I don't have a .33 MLC capacitor. I have a .1 tantalium cap at the input, but like you mentioned, its a little far, about 3-4 inches. I have a really old and heavy oscilloscope, but its filled with animal waste. Can I use a speaker with a capacitor instead, so I can listen to it? Or do I need dog ea...
by solar3000
Tue Jan 02, 2018 7:56 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

sorry, my descriptions are all wrong. Just look at the photos.
everything works, it just doesn't work as well as I'd like and it doesnt work as spec.

I guess the real question is, do you see any issues with wiring, wires used; too long, too bent, to far etc...
by solar3000
Mon Jan 01, 2018 9:50 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

Yeah, the diodes are ok, otherwise I would have had quite a BBQ. So, yeah, like the first picture in the link you provided.
by solar3000
Mon Jan 01, 2018 6:20 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

Re: LM 1084/338/317/etc... voltage drop at < 1A

I should note that the source is a 24 Volt transformer ( probably 6 or 7 amps, twice the weight of a 24volt/2amp transformer ) Rectifier is: two diodes. anodes to the two ends of the transformer's secondary. Cathodes soldered together and wired to transformer's center tap. The DC is buffered by two ...
by solar3000
Mon Jan 01, 2018 6:11 pm
Forum: General Discussion
Topic: LM 1084/338/317/etc... voltage drop at < 1A
Replies: 23
Views: 6115

LM 1084/338/317/etc... voltage drop at < 1A

So, looking at specs for LMs 1084, 338, 317, etc...the basic adjustable 1.2 - ~30 volts circuit is about the same. Whether it be from TI, Nat Semi, NEC etc... I've been testing them on solderless boards. I've dug up some of the one's I've built in the past ( some LM317s, a 1084, etc... ). All of the...