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  1. G

    0-30 Vdc Stabilized Power Supply

    This is very good advice by the way  ;D I blow around 10 or more fuses when tried to connect a good ampermeter in series with the load. When me and my friend tried the PSU it worked good except when we tried to test its current limit with a low resistence ampermeter we got one big problem - the...
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    0-30 Vdc Stabilized Power Supply

    hi again. after some time i managed to build the supply with some little differences - i used 1W R1 and 741CN / LM1458 instead of OPA445 since i cant find those OPA's. It was quite fun ti run it for first time since i forgot to put R4 and there were no change at output :) But i noticed some...
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    0-30 Vdc Stabilized Power Supply

    thanks for the web link audioguru ! The strange thing in this situation is the fact that i was in the farnell's distributor in my country,but they said no such op-amp is available... Seems i need to ask them again with some more details.
  4. G

    0-30 Vdc Stabilized Power Supply

    one quick question : if i cant find OPA445AP and cant use TL081 is there any other op-amp which i can use ? Very "funny" situation - the pcb board is done and all the other parts are here,only the op-amp cant be found to complete the PSU... thanks
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    Led display Digital Voltmeter question

    hi again. Thanks for fixing audioguru.I didnt get any atentioned about V-A or A-V connecting of the meters,i planed to do when eventually connect them in final PSU. Can  i use this "circuit" instead of previous one ?
  6. G

    Led display Digital Voltmeter question

    there is the schematic of the circuit i am asking about. is it possible to do it like this ? sorry for the low quality image :)
  7. G

    0-30 Vdc Stabilized Power Supply

    thanks for the fast reply audioguru. i'll try to find some new replacements for the TL081.I think i checked some of those posted here,but couldnt find them in local stores.Which means i have to search for another replacements. The transformer is "custom made" and should have max 3,5A at 26V...
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    Led display Digital Voltmeter question

    thanks MP. But still one question remains - can i use the ampermeter to measure the current of the power supply,which is powering the ampermeter ? sounds little confusing - but the case is : if i have a stable 5V 1A+ power supply can i power the ampermeter from it and use the ampermeter to...
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    0-30 Vdc Stabilized Power Supply

    Hi. i decided to try making this power supply.I almost got all of the parts as described in the scheme. But have several questions ( i read most of the posts in this topic,but the 44 pages can drive reader sometimes to confusion :P ). I got the standart TL081 and i hope this wont be a...
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    Led display Digital Voltmeter question

    thanks MP ! I saw this schematic : it is different than the 2 ones on projects section. But i have some other questions popuped since i saw the fixed circuit. pins 32 and 35 are connected to the analog(common) ground,but in the other two schematics they are not,can this be considered as a...
  11. G

    Led display Digital Voltmeter question

    Hi. i have several questions about the voltmeter. I built it,but it has some problems. 1.When the input is empty,i.e. no voltage is monitored the circuit has random segment flashing + random flashing of the minus sign.This occurs in (average) same periods like 10sec pause then flashes,10sec...
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