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Posts posted by ante
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They might be envious and give you a fine! ;D
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The closest I’ve got is Hameg HM1005 in German; would it be of any use to you?
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What do the cops have to say about it? ;D
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Hi,
We need to see the schematic. -
The piles of nice to have stuff have a tendency to grow over time. Once in a while a cleanup and sort out go-through-the-piles is necessary! Unfortunately it is unavoidable to find that some time after such an event you need a piece you have thrown away! :P
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Hi AG,
Ok, I see what you mean. On the other hand the ICL7107 is available in any convenient store but the CA3161 & CA3162 is not! ;) -
I don’t see your point here!
The CA3161 has 16 pins so has the CA3162.
The ICL7107 has 40 pins.
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You don’t need any transformer to switch up or down the voltage just an inductor or some caps. In case you like to galvanicaly isolate the input from the output a transformer would help though.
A linear regulator would waste most of the power in a case like this. -
Hi indulis,
I agree, 100A is not easy to handle and there might be a better solution to this depending on the target for the measurements. This amount of current will sure require some heavy duty KELVIN CLIPS! ;D -
I don't see NewToElectronics mentioning/asking anywhere about powering a cell phone, but anyway...
Summing the inputs from this and another tread took me to that conclusion my dear Watson! ;)
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You could rewind the secondary 5Volts (or 3.3V) in a computer PSU to 2Volts (or which voltage you want) and boost the rectifier circuit. You have to arrange a shunt and some feedback to the regulator circuit to obtain a constant current.
There are different ways to do this but these are heavier and more expensive. -
Hi Peron,
You can almost always replace these two ICs with one ICL7107. ;) -
If you’re going to power a cell phone which normally has a 3.7V pack there is some headroom. The phone probably switch of or give low battery warning around 3.2V and a topped of 3.7V pack can carry 4.65V so, between 3.2 and 4.65V will work. You might run it of 3 alkalines.
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Speaking of a step-up voltage regulator, are there any voltage regulators capable of converting 3V to 3.7V?
Put in your requirements here:
http://para.maxim-ic.com/search.mvp?q=dcdc_all&an_1=Family&av_1=Switch-Mode%20DC-DC%20Power%20Supplies
and you will be recommended some alternatives to chose from.
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Hi John,
Apology accepted, I can understand what you where trying to do for Steven but perhaps he needs some help to moderate the HV board, at least for a while. As you mentioned earlier Stevens spelling is not 100% and he sounded a bit unsure about this himself too. But you are absolutely right; Steven is the most frequent contributor to the HV board, no doubt! -
You could also try paralleling a few LM338 if you like, this way you don’t need as many parts.
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Ok, if you must go purely mechanic you must use some power which is equivalent to the work that’s needed to be done. A solenoid (plunger) needs power and I don’t know how much since I don’t have the formula clear. Are you in shortage of power to spend in this project? I suggested the propane / igniter variant since this will consume very little power from the project. I don’t think a robotic arm or similar would be an option here.
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A circuit diagram would help, some phones have a step-up regulator right at the input and some have a step-down. It is a good start to know which you phone has.
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Hi Mike,
There are many kinds of voltage regulators, can you be more specific?
I assume you understand the general term (voltage regulator)? -
Hi shaiq,
You can use compressed air, carbon monoxide, or perhaps a small amount of propane (cigarette lighter gas) and an igniter.
Or, you could go mechanical and do it like we discussed in an earlier thread. -
Hi Tkil,
You can use a variable resistor in a circuit with a GaAs-tuningdiode if you like. ;) -
Hi Claudio,
Welcome to our forum.
I’m glad to hear you find this place interesting and useful.
I don’t think your English is poor; it seems to be above average among the forum members. ;) -
Only 100 Volts difference in DSS
15Volts in V(GS) …. (10 vs. 25)
I(D) …. (3 vs. 1) -
Hi firfirik,
Welcome to our forum.
This circuit originates from an Elektor magazine (and book); I don’t remember which but its many years back. I don’t see any reason why it shouldn’t work.
Hope this helps!
0-50V 2A power supply
in Electronics chit chat
Posted
Hi,
A few things to note:
I don’t believe the voltage will go all the way down to zero, perhaps 0.5V but that might not be important for you? The resistor R12 kind of decides the minimum voltage here and this resistor should have a 5W rating. R11 (the shunt) can be made by paralleling two 0.15R (2W) since 0.075R is not easy to find. The LM10 is a slow horse and the transistor T3 protects the circuit from destructive over current. Someone has written 42V on the diagram but the text says 36V transformer and the later is the correct value I believe. ;)