ante

Sounds like cheap low grade quality!

Hi roger, Welcome to our forum. These things can be very tricky to get your hands on, unless you know somebody on the inside. May I ask what the purpose is; a mod, repair, tuning or just curiosity?

An assignment no doubt! At least you did not put this in the wrong place like your class mate did! 8)

An induction motor is not easy to regulate.

Hi, Some of these meters has a working voltage of 5.0V, have you checked its datasheet? You might have killed it! :o

I agree, that’s good advise!

I suppose you don’t have any circuit diagram or a picture to show where this part is located relative other things in the circuit?! That might give some ideas of what this part is doing in its environment.

Hi hangwaiter, Welcome to our forum. Is this an assignment? 8) Well, if you got DC from your “electronic transformer” you can use a PWM circuit to produce any light intensity between 0 an 100%. This can be a fixed pulse width selected by a switch, as you required. There is really not much choice here if you don’t want heat losses or are unable to regulate the primary of the transformer.

Hi explorador, Don’t forget to put a fuse in there somewhere to protect from disaster! ;)

A small RC servo can be run from a simple 555 circuit.

Hi Niksun, The PSU is not any good for charging alkalines! The DC is much too good! You should use only a half wave rectifier and no smoothing cap for best results!

Yeah, that was pretty stupid! ;D To pinpoint which parts can be expected to be dead we could use a schematic! If you are very lucky only a few parts are toast.

Well, IGBTs are a kind of power transistors (Google IGBT) and you have to have some basic knowledge to be able to test them properly. You will find them on the heatsinks (if the manufacturer use this kind of transistors) they come in many shapes so I don’t know exactly what they looks like in your inverter, some are even light trigged by optofibres. A schematic and a service manual would be nice too! Have you made a visual inspection of all the parts, looked for burns or discolored parts or pcb sections?

Hi jryan, Welcome to our forum. The Martel calibrator looks expensive; you are obviously looking for a simpler solution. I had a similar question not long ago here: http://www.electronics-lab.com/forum/index.php?topic=8260.0 This might be a start. ;)

Hi defaced, This should be helpful I hope!

Impossible to answer! Too many factors like percentage of area to be etched away, the type of pcb foil (20, 35, 70u), the solution you use, temperature and more.

Hi alkv, I don’t recognize the model of your TIG, I guess it’s not a US or EU made one? The fact that it shuts down just after power up suggests that it performs a self test which fails. If the fan has been broken the odds are that something has died from overheating, have you checked the IGBTs for short or open circuit?

Does this sound level indicator have an echo too? ;D

Hi monoman, Welcome to our forum. A circuit which converts DC to AC is usually called an inverter are you sure this is what the circuit does? Can you post the schematic so we can see what you have built?

Hi boschman, Why did you remove it form your cars instrument cluster? Do you suspect there is something wrong with it? What are the symptoms? I do not recommend replacing it with a jumper, this can turn out to be a very expensive test! I still believe it is a capacitor, have you measured it?

Is this the same persons leaving the room as in the “Light management system” thread?

OK, you could use AC-fans and a simple triac control for the regulation.

Oh my, some days I wish I didn’t go here at all! I believe it’s time for…….now where did I put that bag….. Oh here it is, knock yourself out!

Hi Zeppelin, Not critical, just any DC works since it’s shopped up anyway at a high frequency.

Hi ferris, Welcome to our forum. Are you sure you want to control the fans yourself? Why not just let them run at a slow speed (silent) as soon as you use the equipment?