Electronics and Embedded Programming V3 - Developers

[QUOTE=Chryseus;36919401]£7 to £15[/QUOTE] Holy hell that's like $30 in real people money!!

[thumb]http://i50.tinypic.com/2ls9kkz.jpg[/thumb] I made a switchmode PSU out of a motor and 555 timer. I also tried to give it a cutoff at a certain voltage, but that didn't work out so great, I think the op-amp was frilled. The motor was spinning by the way, without it spinning it goes up to 24V (with a 10 kOhm load). How can I make it more powerful? Smaller inductance? Right now I can barely get any juice out of it.

[QUOTE=DrLuke;36921793][thumb]http://i50.tinypic.com/2ls9kkz.jpg[/thumb] I made a switchmode PSU out of a motor and 555 timer. I also tried to give it a cutoff at a certain voltage, but that didn't work out so great, I think the op-amp was frilled. The motor was spinning by the way, without it spinning it goes up to 24V (with a 10 kOhm load). How can I make it more powerful? Smaller inductance? Right now I can barely get any juice out of it.[/QUOTE] Check this PDF out: [URL="http://my.ece.ucsb.edu/Bobsclass/194/References/NonIsolated/Buck/Buck%20Converter%20Design%20Demystified%20606PET25.pdf"]Buck Converters Demystified[/URL] You maybe saturating the inductor(Especially since you are using a motor)

Another recent project (shitty quality deal with it): [video=youtube;Jn2_RL4JiAk]http://www.youtube.com/watch?v=Jn2_RL4JiAk&feature=vmdshb[/video] Now I'm sure there would probably be a WAY easier way to go about remotely shutting down a computer but I don't care - this was kinda fun. :v:

[QUOTE=POLOPOZOZO;36919350]I'm not sure where to ask this, how much would a ZM1000 nixie tube sell for?[/QUOTE] Why not get a bunch of russian ones off ebay? They're next to free.

[QUOTE=SubbyV-2;36918876]It still should work, Just not as efficient as a toroid, i hope anyway [URL]http://www.ebay.com.au/itm/Power-Transformers-Round-Green-Toroid-Ferrite-Cores-75mm-x-39mm-x-13mm-/160840808986?pt=AU_B_I_Electrical_Test_Equipment&hash=item2572dbfa1a#ht_1853wt_1139[/URL] Would this be a better option?[/QUOTE] Yes, that would be much better. A closed core would give you much better efficiency and more current. I would stick to ferrite cores though (like the one you have in that link), because they saturate more easily than iron core transformers, giving you some current limiting. The efficiency of an air gap transformer is absolutely terrible. Even a small slot in a closed core transformer completely messes up your efficiency. But feel free to experiment with efficiencies, now that you have both cores. Would be an interesting experiment. Also I want to apologize for my previous reply. It wasn't particularly helpful...

[QUOTE=masterburner;36924582]Yes, that would be much better. A closed core would give you much better efficiency and more current. I would stick to ferrite cores though (like the one you have in that link), because they saturate more easily than iron core transformers, giving you some current limiting. The efficiency of an air gap transformer is absolutely terrible. Even a small slot in a closed core transformer completely messes up your efficiency. But feel free to experiment with efficiencies, now that you have both cores. Would be an interesting experiment. Also I want to apologize for my previous reply. It wasn't particularly helpful...[/QUOTE] How about winding it for a flyback? how would you suggest i do this?

[QUOTE=MIPS;36923501]Why not get a bunch of russian ones off ebay? They're next to free.[/QUOTE] Who said anything about buying them muahahaha

How could I go about changing my rc filter to a second order one? I know you just add a second filter effectively, but it's currently controlled by a potentiometer.. I can't add another potentiometer because that'd just be silly so how can I have it so one will control both parts of the filter?

[QUOTE=chaz13;36946431]How could I go about changing my rc filter to a second order one? I know you just add a second filter effectively, but it's currently controlled by a potentiometer.. I can't add another potentiometer because that'd just be silly so how can I have it so one will control both parts of the filter?[/QUOTE] The easiest solution I think is to get a stereo potentiometer. That's basically 2 pots on the same shaft.

I made a little 24v supply. [url=http://i.imgur.com/wBB7N.jpg][img]http://i.imgur.com/3gbKx.jpg[/img][/url]

[QUOTE=ddrl46;36958525]I made a little 24v supply. [url=http://i.imgur.com/wBB7N.jpg][img]http://i.imgur.com/3gbKx.jpg[/img][/url][/QUOTE] It's so cute.

[QUOTE=ddrl46;36958525]I made a little 24v supply. [url=http://i.imgur.com/wBB7N.jpg][img]http://i.imgur.com/3gbKx.jpg[/img][/url][/QUOTE] Can we see the inside? :quagmire:

[QUOTE=TTSDA;36959500]Can we see the inside? :quagmire:[/QUOTE] Yes. [URL=http://i.imgur.com/kpuH0.jpg][IMG]http://i.imgur.com/kpuH0l.jpg[/IMG][/URL] Nothing special, will replace the thin wires at some point. Thanks for providing me with a box to put the supply in, DrLuke.

Where did you get the case from?

[QUOTE=DrLuke;36959839]Where did you get the case from?[/QUOTE] Overpriced conrad, almost as bad as sparkfun (except their solder + soldering stations).

So I ordered 50pcs of 2W resistors, and instead got a single 50W resistor. Atleast it has the same value. It should come in quite handy when I need to test a PSU or something. [thumb]http://i49.tinypic.com/28k6644.jpg[/thumb] Also my 20m of stranded 10mm² wire arrived. I'll use it to wind a proper primary coil for my tesla coil, which should eliminate most of the problems I had. [thumb]http://i45.tinypic.com/2sb51ee.jpg[/thumb]

My 60W hot glue gun arrived from DX so I decided to put it to use, since we all like power supplies: [t]http://i.imgur.com/FkeyD.jpg[/t] [t]http://i.imgur.com/CTIDd.jpg[/t] [t]http://i.imgur.com/bvYzw.jpg[/t] Made in England top quality.

"Kill meeee eeaaeegh" Nah, That should be an interesting PSU.

[QUOTE=Tezzanator92;36977390]"Kill meeee eeaaeegh" Nah, That should be an interesting PSU.[/QUOTE] At least he will know when he is overloading it. [img]http://b.vimeocdn.com/ts/662/520/66252085_640.jpg[/img]

Added the transformer, 10-0-10 with a spare 20V winding. [t]http://i.imgur.com/HeNVo.jpg[/t] [quote]At least he will know when he is overloading it.[/quote] I'll be adding (non-adjustable) current limiting.

I just got a stereo set in for repair, just look at these specs! [img]http://i.imgur.com/4N2Bs.jpg[/img]

I love me some square waves. PWM sound?

That's nothing strange, actually. They sometimes refer to this as a "PWM DAC". The amp most likely has some class D architecture ([url]http://en.wikipedia.org/wiki/Class-D_amplifier[/url]). But I agree, "1 bit DAC" looks kind of funny.

[QUOTE=masterburner;36980272]That's nothing strange, actually. They sometimes refer to this as a "PWM DAC". The amp most likely has some class D architecture ([url]http://en.wikipedia.org/wiki/Class-D_amplifier[/url]). But I agree, "1 bit DAC" looks kind of funny.[/QUOTE] If it were a PWM DAC I'd expect them to put the resolution of that on the case instead.

Fuck the inside case of this tube radio is horrible, it has a thick layer of tobacco residue that's very hard to shift, at the moment I'm practically washing it with IPA and going at it like mad with a toothbrush. Smokers should be banned from owning electronics, it's fucking disgusting. [editline]28th July 2012[/editline] [QUOTE=Chryseus;36980791]Fuck the inside case of this tube radio is horrible, it has a thick layer of tobacco residue that's very hard to shift, at the moment I'm practically washing it with IPA and going at it like mad with a toothbrush. Smokers should be banned from owning electronics, it's fucking disgusting.[/QUOTE] [b]Edit[/b] Got most of it off *vomit* so it looks (and smells) a lot nicer, going to get some Brasso to polish it to a nice shine and finish it off with some wax.

My scope previously was owned by a smoker, but it barely smells anymore.

I just scored a canon scanner, a box full of banana plug cables and a TI30 scientific calculator at a yard sale for all of $3. Cannon's gonna get dissected but the ti-30 is easily gonna be my main calculator around the workbench. Oh and my brother gave me a 32 inch LCD tv that doesn't work, repair time! [editline]29th July 2012[/editline] Oh yeah and I got a tape recorder/stereo from mom to disassemble and I found an old satelite tv box, plus I'm going out today to check out some more yard sales.

[QUOTE=Chryseus;36980791]Got most of it off *vomit* so it looks (and smells) a lot nicer, going to get some Brasso to polish it to a nice shine and finish it off with some wax.[/QUOTE] I don't know if putting wax on the components is a good idea, since these things tend to get warm on the inside... If my tube radio has been playing for a few hours, the whole chassis of the thing gets warm.

[QUOTE=masterburner;36986916]I don't know if putting wax on the components is a good idea, since these things tend to get warm on the inside... If my tube radio has been playing for a few hours, the whole chassis of the thing gets warm.[/QUOTE] I'll only be waxing the outside, it will be a thin coating so heat shoud not be a problem.