Electronics and Embedded Programming V3 - Developers

It could be: A small relay, possibly solid state A small transformer My money is on transformer.

[QUOTE=Chryseus;35473663]It could be: A small relay, possibly solid state A small transformer My money is on transformer.[/QUOTE] Pretty tiny transformer, crystal oscillators aren't exactly huge. and they dwarf that thing.

Well it came out of an old phone and they usually do contain a small transformer, it could also be an inductor with multiple taps.

Sorry, I should have been clearer with the scale. [img_thumb]http://filesmelt.com/dl/2498.jpg[/img_thumb]

[QUOTE=SteelReal;35473809]Sorry, I should have been clearer with the scale. [img_thumb]http://filesmelt.com/dl/2498.jpg[/img_thumb][/QUOTE] Alrighty then, probably is a transformer or inducer of some sort.

Trying to implement serial RapidIO; what have I gotten myself into... Also, if anyones familiar with Renesas' SuperH stuff; shoot me a PM.

[img]http://i.imgur.com/wlSg5.jpg[/img] Wasted two 3€ ICs by a microscopic solder bridge between two pins, shorting the output to ground, instantly frying the ICs. Also a transistor that accidentally blew up while testing something (I peeled the back off), and the rubble of insulation is from all the wire used for my revision 2 of the tesla-coil signal generator and preamp: [img]http://i.imgur.com/To6hg.jpg[/img]

I picked up a 5-14 V variable power supply kit at my local electronics store and a 12V transformer to power it. In the instructions it says to use a transformer 2V higher than the desired output and anything too much higher can cause the regulator to die in a few minutes. I will primarily be using 5V output with the 12V input. Would this really cause a problem and what could I do to fix it besides getting a different transformer? [editline]14th April 2012[/editline] On another unrelated note, I need a multimeter. Any suggestions? I'm looking at the Klein MM200 which I've used before and seems to work pretty well.

[QUOTE=ryan1271;35574744]I picked up a 5-14 V variable power supply kit at my local electronics store and a 12V transformer to power it. In the instructions it says to use a transformer 2V higher than the desired output and anything too much higher can cause the regulator to die in a few minutes. I will primarily be using 5V output with the 12V input. Would this really cause a problem and what could I do to fix it besides getting a different transformer? [editline]14th April 2012[/editline] On another unrelated note, I need a multimeter. Any suggestions? I'm looking at the Klein MM200 which I've used before and seems to work pretty well.[/QUOTE] If it's based on a linear regulator (i.e. LM317) then it will dissipate the difference in voltage multiplied by the current draw as heat. So if you're drawing 1A @ 5V with a 12V input, you'll be dissipating 7W which is quite a lot of heat. You can stick a big heatsink on it if you can find one.

[QUOTE=Xera;35574984]If it's based on a linear regulator (i.e. LM317) then it will dissipate the difference in voltage multiplied by the current draw as heat. So if you're drawing 1A @ 5V with a 12V input, you'll be dissipating 7W which is quite a lot of heat. You can stick a big heatsink on it if you can find one.[/QUOTE] The kit I bought came with an enormous heat sink. LED's typically draw 20mA right? How many could I power before worrying about breaking something? Would it just be easier to use an 7-8V transformer?

[QUOTE=ryan1271;35575404]The kit I bought came with an enormous heat sink. LED's typically draw 20mA right? How many could I power before worrying about breaking something? Would it just be easier to use an 7-8V transformer?[/QUOTE] Well that depends on the characteristics of the heatsink that came with the kit. If it's fairly large you'll probably be find running a bunch of LEDs off it, but I'd go for a constant current supply instead. You can buy these ready made or make a simple one with a LM317 and a few external components. [url]http://users.telenet.be/davshomepage/current-source.htm[/url]

You shouldn't have a problem with 12V. It should run fine.

It won't actually be 12V once you rectify and filter it, more like 15.5V to 14.9V

Just won a Tungsram 12AU7 (ECC82) dual triode tube for 99p. [img]http://i.imgur.com/plDgQ.jpg[/img] Unknown condition but meh it's cheap. Also British made :dance:

So i just got my first smartphone a few Days back and i found a circuit simulator app called everycircuit, the free version is gimped to hell and the paid version is pricy. Does anyone have it and is it worth buying?

[url]http://www.falstad.com/circuit/[/url] Use this one, it even is free.

How do i make that work on my phone?

You don't, but why would you want it on your phone? You could get his android app though I guess: [url]https://play.google.com/store/apps/details?id=com.everycircuit.free[/url]

[QUOTE=DrLuke;35605789]You don't, but why would you want it on your phone? You could get his android app though I guess: [url]https://play.google.com/store/apps/details?id=com.everycircuit.free[/url][/QUOTE] Yes. That's the circuit simulator I asked about 4 posts back. I wanna know if anyone's used the full version and if it's any good since the free version is gimped to hell. Why isn't bad reading still a rating?

Most of these simulators are pretty terrible when it comes to simulating anything other than a basic circuit. Really your much better off with something like LTSpice, Multisim, Qucs, etc. I'm not aware of any decent SPICE based simulator for android. [url=http://www.falstad.com/circuit/#%24+1+5.0E-6+38.696464541249114+62+5.0+50%0Aj+336+224+384+224+0+-4.0%0Ac+256+224+256+288+0+1.0E-8+0.988059967951531%0Ar+336+224+336+288+0+100000.0%0Aw+336+288+384+288+0%0Al+256+224+256+160+0+0.0010+9.760204939016819E-5%0Ac+208+160+208+288+0+1.0000000000000001E-7+0.4329858121954974%0Aw+208+288+256+288+0%0Aw+208+160+256+160+0%0Aw+256+160+336+160+0%0Aw+336+160+384+160+0%0Aw+384+160+384+208+0%0Ar+384+160+448+160+0+2000.0%0Aw+384+288+448+288+0%0Av+448+288+448+160+0+0+40.0+5.0+0.0+0.0+0.5%0Ac+288+224+336+224+0+1.0E-8+0.4841055968207808%0Aw+384+240+384+288+0%0Aw+256+288+288+288+0%0Aw+288+288+336+288+0%0Ar+256+224+288+224+0+0.0010%0Ad+336+224+336+160+1+0.805904783%0Ao+2+32+0+35+0.5846006549323611+5.7089907708238396E-6+0+-1%0A]Example of Java Circuit Sim failing[/url]

[QUOTE=Chryseus;35611441]Most of these simulators are pretty terrible when it comes to simulating anything other than a basic circuit. Really your much better off with something like LTSpice, Multisim, Qucs, etc. I'm not aware of any decent SPICE based simulator for android. [url=http://www.falstad.com/circuit/#%24+1+5.0E-6+38.696464541249114+62+5.0+50%0Aj+336+224+384+224+0+-4.0%0Ac+256+224+256+288+0+1.0E-8+0.988059967951531%0Ar+336+224+336+288+0+100000.0%0Aw+336+288+384+288+0%0Al+256+224+256+160+0+0.0010+9.760204939016819E-5%0Ac+208+160+208+288+0+1.0000000000000001E-7+0.4329858121954974%0Aw+208+288+256+288+0%0Aw+208+160+256+160+0%0Aw+256+160+336+160+0%0Aw+336+160+384+160+0%0Aw+384+160+384+208+0%0Ar+384+160+448+160+0+2000.0%0Aw+384+288+448+288+0%0Av+448+288+448+160+0+0+40.0+5.0+0.0+0.0+0.5%0Ac+288+224+336+224+0+1.0E-8+0.4841055968207808%0Aw+384+240+384+288+0%0Aw+256+288+288+288+0%0Aw+288+288+336+288+0%0Ar+256+224+288+224+0+0.0010%0Ad+336+224+336+160+1+0.805904783%0Ao+2+32+0+35+0.5846006549323611+5.7089907708238396E-6+0+-1%0A]Example of Java Circuit Sim failing[/url][/QUOTE] Convergence failed have been my problems, especially with oscillators. But was that a buck/boost regulator?

It's funny how terrible the UI is for just about every circuit simulation program that exists.

[QUOTE=Chryseus;35611441]Most of these simulators are pretty terrible when it comes to simulating anything other than a basic circuit. Really your much better off with something like LTSpice, Multisim, Qucs, etc. I'm not aware of any decent SPICE based simulator for android. [url=http://www.falstad.com/circuit/#%24+1+5.0E-6+38.696464541249114+62+5.0+50%0Aj+336+224+384+224+0+-4.0%0Ac+256+224+256+288+0+1.0E-8+0.988059967951531%0Ar+336+224+336+288+0+100000.0%0Aw+336+288+384+288+0%0Al+256+224+256+160+0+0.0010+9.760204939016819E-5%0Ac+208+160+208+288+0+1.0000000000000001E-7+0.4329858121954974%0Aw+208+288+256+288+0%0Aw+208+160+256+160+0%0Aw+256+160+336+160+0%0Aw+336+160+384+160+0%0Aw+384+160+384+208+0%0Ar+384+160+448+160+0+2000.0%0Aw+384+288+448+288+0%0Av+448+288+448+160+0+0+40.0+5.0+0.0+0.0+0.5%0Ac+288+224+336+224+0+1.0E-8+0.4841055968207808%0Aw+384+240+384+288+0%0Aw+256+288+288+288+0%0Aw+288+288+336+288+0%0Ar+256+224+288+224+0+0.0010%0Ad+336+224+336+160+1+0.805904783%0Ao+2+32+0+35+0.5846006549323611+5.7089907708238396E-6+0+-1%0A]Example of Java Circuit Sim failing[/url][/QUOTE] [url]https://play.google.com/store/apps/details?id=org.vlada.droidtesla[/url] SPICE circuit sim for Android.

Nothing like bargains. Purchased these for gold scrap value, or about $1.50 per chip. [IMG]http://i11.photobucket.com/albums/a166/ballsandy/100_2734.jpg[/IMG]

Well, do they still work?

[img]http://dl.dropbox.com/u/100275/circuit.PNG[/img] Forgot to mark the cap, it's 120pF. Power supply is 1.5V (Single AA). Can anyone tell me what this circuit is meant to do? My guess is a boost converter but I've built it in LTspice, falstad java sim and circuitlab and it doesn't seem to do anything.

[QUOTE=Xera;35621672][img]http://dl.dropbox.com/u/100275/circuit.PNG[/img] Forgot to mark the cap, it's 120pF. Power supply is 1.5V (Single AA). Can anyone tell me what this circuit is meant to do? My guess is a boost converter but I've built it in LTspice, falstad java sim and circuitlab and it doesn't seem to do anything.[/QUOTE] You're right it's a boost converter, however you have to use the uic (use initial conditions) flag in the transient simulation or it won't simulate correctly. This is because the initial operating point is done by a DC circuit analysis which won't give you the correct transient results, this is why the uic flag is important since it sets the initial conditions to zero (or a condition you have specified). [t]http://i.imgur.com/iG9tX.jpg[/t]

[QUOTE=DrLuke;35618471]Well, do they still work?[/QUOTE] They need a wipe. I'm waiting for a sunny day because I don't have a UV eraser. :v:

snip

[QUOTE=Chryseus;35621881]You're right it's a boost converter, however you have to use the uic (use initial conditions) flag in the transient simulation or it won't simulate correctly. This is because the initial operating point is done by a DC circuit analysis which won't give you the correct transient results, this is why the uic flag is important since it sets the initial conditions to zero (or a condition you have specified). [t]http://i.imgur.com/iG9tX.jpg[/t][/QUOTE] Thank you. I'll have to keep that in mind for future simulations.