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besarmatis

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  1. I'd rather stay with the potentiometers, because I think it would get me annoyed to push buttons from 0V all way to 30V :D But I think you want digital to analog converter. Or maybe you can make something with the PWM signal.
  2. Of course, leaving fans non stop has it's own pluses: less heat in the case, but it is the most simple way. For us - electronics it is not fun... :D Sometimes I think, why factories can do better, why cannot I built even more better project, even it is not worth the price, but it is fun...
  3. Think about auto cooling system using some of the thermal sensor with AVR. It very easy to do that using atmel microcontroller, thermal sensor and the L293 logic motor controller.
  4. Will you try the avr programming for vmeter and ameter?
  5. I think that link should be put on the top of the project page, moreover, someone should make new tutorial for building this project. For example you, effenberg0x0, when you done your project :D Maybe I could make some tutorial after 2 months with pictures and schematics and pcb and periphery like lcd vmeter ameter and automatic cooling system with fans (avr).
  6. So it the only matter how to connect the end pins of pot is how you want to adjust voltage. First way: turning clockwise increasing voltage. Second way: turning clockwise lowering voltage. Now I understand :) The middle one stays the same in both ways.
  7. OMG how cheap :'( I've been searching for shop to make the transformer for me for a few hours, but no luck. I tried to search for already made trafos and found such: Toroidal mains transformer 160VA 230/30V for 40$. So for 2 it would be 80$... It would be perfect, but the price for the student... :D Well, I'll have to choose whether to eat food or to make a dual polarity power supply... :D
  8. effenberg0x0, if it's not a secret, what was the price of you transformer? And to be correct, if I want to build the version of the project 0-30V 0-3A, then I need secondary winding 30V and at least 4A?
  9. Thanks for reply, audioguru, So were I right saying that one is ground pin and two others are adjustable resistance? And were I right saying which pin should be connected to looking at the original project? I know that it has to be completely separate power supplies, and the question is: which one is better, to use two transformers or one with double second winding? Or it is doesn't matter? One more question, maybe someone could suggest some e-shop, where I could buy transformer (230V first winding) with lower price, because in my country (Lithuania), for example, transformer 2x24V 2x3.12A (sec. wind.) costs 50$. So I already bought one, but now I need to buy new one which has more power and I don't have bags of money, so I need to find cheaper ones :(
  10. effenberg0x0, I saw that table and I appreciate for you comparing parts :) The only thing left for me is to buy some new parts and the transformer (which is the worst thing, because it costs much). Someone, please answer my question which i posted before about the pot connection. I need to know if my thoughts are right. And one more question. I want to build two of these projects to have 2 separate power supplies and if I need, I have a dual polarity one. So the question: Do I need 2 transformers or it is enough to have one but with dual second winding (like 2x30V 2x4A)?
  11. If only I saw this conversation a few days earlier... :D Last night I built the PS using schematics and part list from the original version... I tried to test it: connected voltmeter to the output, then turned it on, led blinked and I saw a voltage on the voltmeter. But it doesn't matter anymore :) Now I will make a new project from the latest schematics... And now I want to ask a lame question about potentiometer. Let's say I use the original version of PS. I'm confused about how to connect the potentiometer (ie. Voltage adj. one) correctly. Pot has 3 pins: ground, the one we take + from pot, and the one we give + to pot. So is that right to connect the ground one to 5th, middle one to 12th, and the one where we give plus to pot - to 10th?
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