Jump to content
Electronics-Lab.com Community


  • Posts

  • Joined

  • Last visited

Everything posted by mendimano

  1. Hi imester, nice work by the way, can you tell me where did you find voltmeter and ammeter with decimal point accuracy? or did you build yourselfe, and can you post any links to buy those voltmeter and ammeters?
  2. I have 4 high power SCR (silicon controlled rectifiers) im intend to use them as controlled rectifier bridge, at internet i have found the schematic which seems to me as ok, but some components dont have values, can any one advise me and help.
  3. Hi seb, If you have carefully readed the thread then you will have answers to all of your questions :)
  4. Hi everybody i hope someone can help me to identify and eventualy send me datasheet for this component wich i have removed from an old industrial inverter ( 4 of them), the component has this marks on it: AEG T 45 F1100 EFC-2?LO ( one character aint fully readable i marked with ?) and havs an SCR or THyristor symbol on it. Very best regards.
  5. Hi red baron , try to replace the R17 from 33 Ohm 1/4 watt rezistor to 47 Ohm 1/4 watt rezistor.
  6. Thanx for help Hero999, i wonder if is it posible from you to post a scetch shematic of this.
  7. Hi red baron, congratulations for a good work, im posting some pictures of power supply 5 ampers version that i have build it one year ago, it is working perfectly and acuratly thanx to audioguru and redwires tips schematics and parts list, i have used 3 power tranzistors MJ11016 and 10 amp 30 volt transformer, i have tested with 30 volts 8 ampers load it worked without any problems, some tests and measurments you will have to do it in your own becouse it is imposible to see from here what is wrong with your power supply, but anyway im encouraging you to finish your power supply . very best regards
  8. Hi neba 3939, this is an intresting project, i dould like to try this project, is it posible from you to post the values of components, for diodes for example.
  9. Well Tompa it is dificult to help you from here, maby you should check your output tranzistor/tranzistors, i watched the video and your P.S worked then just fine, check for any wires soldering joints wich might broaken during the instalation of your P.S to enclosure.
  10. Hi evererybody, i have found this project on internet, it seems intresting to me, im calling everybody to discus about this project. thanx
  11. Let me inform you that i have changed the value of R17 from 33 Ohm to 47 Ohm, and now the warning LED of an current limiter does not light when there is no load, thank you Audioguru. Your video shows that the warning LED lights when there is no load and the current-setting pot is turned down which is wrong. It is due to an input offset voltage of U3. Increase the value of R17 (it is now 33 ohms) to maybe 47 ohms or 68 ohms until the LED does not light when the current-setting pot is at minimum.
  12. Thanks for your tips gogo, seems reasonable to use 1% resistors for more accuracy, ill try that and i hope it will work beater then, and happy new year
  13. hi Picmaster is it posible from you to post the schematic and pcb of this volmeter of yours? ( PIC based)
  14. Im using the the ICL7107 CLP version, i have produce the -5 volt with IC ICL7660
  15. Yes i have build it , and according to IC datasheet, actually i have build it 2 of them one will ICL7107 Maxim Dallas production and one with INTERSIL ICL7107 they are both working good as long as I'm supplying them with 9 volt battery , only I'm having problem when I'm supplying them through transformer , i can say from my experience that the Intersil IC is working more stable when I'm feeding them through transformer, could it be the problem with smoothing the AC current? any ideas and suggestions about the rectifier bridge and capacitor (value), and how much should be the voltage of AC voltage of secondary of the transformer? since I'm using the L7805 regulator for voltmeters.
  16. Yes that's correct i have used the 100 microfarad capacitor, i will try to use 1000 microfarad capacitor instead, thanks for advice
  17. I have built the voltmeter and it works O.K when I'm supplying it with 9 volt battery, but when I'm supplying it with 7,5 volt transformer and a rectifier bridge with 4X1N4007 diodes as a rectifier bridge and 100mF capacitor the last digit is going up and down, in other words voltmeter becomes unstable, any ideas and sugestions??
  18. I agree with you guru, ( you got a good point with working ina a dark ;D) but i have only 7 segment LED displays, anyway thank you very much for your help and advice
  19. Dear guru my power supply transformer has a 2 pair of windings 15-0-15 volts (30 volts 10 amps) and 7.5-0-7.5 volts ( 15 volts and 2 amps) I'm intend to use this second winding to supply the LED voltmeters ( with rectifier bridge 4X 1N4007) also in a circuit that I'm going to use is an ICL7660 as a negative voltage converter (-5 volt). Please see attached schematic and PCB layout, i think until now this is the best and modified schematic, i hope doesent have any errors.ICL7106-7_Eagle_Files.zip
  20. Hi, im intend to build 2 LED voltmeters according to the schematics an PCB posted by M.P, i will use to measure the voltage and curent of Power supply wich i have build acording to the schematic at this site and modified to 0-30 volts 5 amps version, please if anyone can give me some calcuations for resistors value im intending to use 0.27 ohm resistor as a shunt to measure the current, ( R7 of P.S) i have attached the PCB and schematic in eagle format of LED voltmeter. can someone tell me how much should be the value of R3 for 0-30 volts and how much sholud be the value of R3 for voltage 1.35 volts wich i have calculated for voltage drop across the 0.27 ohms resistor sow my panel voltmeter shows 0-5 amps current flow of P.S
  21. And what about R15 ? where is placed this resistor? in my schematic i dont have R15.
  22. Dear Audiguru can you tell me is this changes that you have posted in a latest parts lists ( R1=2.2Kohm , R11=27Kohm, R15=100Ohm, R18=33Kohm, R22=3,9Kohm) are aplicable for 5 Ampers version of power supply old values for this rezistors are ( R1=3.9Kohms, R11=10Kohm, R15=(there is no), R18=20Kohm R22=1.2Kohm)
  • Create New...