tag:blogger.com,1999:blog-8085571700321121668.post3068203817194365368..comments2024-03-08T17:30:40.138+01:00Comments on EA4EOZ, an amateur radio electronic enthusiast: Considerations about the Hiland Adjustable DC Regulated Power Supply KitMiguel A. Vallejo, EA4EOZhttp://www.blogger.com/profile/04739647349389027008noreply@blogger.comBlogger25125tag:blogger.com,1999:blog-8085571700321121668.post-63234279755951460022022-05-26T16:52:20.357+02:002022-05-26T16:52:20.357+02:00No es una fuente de alimentación conmutada, es lin...No es una fuente de alimentación conmutada, es lineal. Por tanto el elemento regulador se va a calentar igual sea un transistor bipolar o un MOSFET.<br /><br />Para aumentar la corriente también habría que cambiar el puente de diodos, que ya va justo para 3 amperios.Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-42319439559127551622022-05-26T15:04:39.595+02:002022-05-26T15:04:39.595+02:00Hola muy buena explicación, pregunto, si en lugar ...Hola muy buena explicación, pregunto, si en lugar del transistor de poder, se lo puede reemplazar por Mosfet , ya que con uno que sea de RDS muy baja calentaría muchísimo menos, y también si agregar mas de estos, ya sea transistores o mosfet se lograría mas amperios en lugar de 3Amp, gracias !!!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-39439309357591588532022-04-19T08:01:54.298+02:002022-04-19T08:01:54.298+02:00I have bot two more hi land 0-30volkt power supply...I have bot two more hi land 0-30volkt power supply I burned up 3 I figured out I mest up on Zener diodes i have not started it yet how do you add lm317 and resistors i trying to create my own bench power supply I need schematics with pictures on how pleases thank you and i also would like to add Paul's DIY electronics blog has good detailed how to but how can i turn 0-30vdc to a 0-100vdc plus 20amps adjustable bench power supply<br />Rocko1966https://www.blogger.com/profile/09788012074084177500noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-233935546124138662021-04-14T01:10:50.876+02:002021-04-14T01:10:50.876+02:00No, this is the only post I have about this power ...No, this is the only post I have about this power supplyMiguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-57527635138454285132021-04-13T21:34:09.069+02:002021-04-13T21:34:09.069+02:00Hi Miquel,
Have you a spanish translation of this ...Hi Miquel,<br />Have you a spanish translation of this topic?<br /> Mario Carneluttihttps://www.blogger.com/profile/17888638703327851934noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-50717381345362427602020-03-11T14:19:08.570+01:002020-03-11T14:19:08.570+01:00I used a 4700uf 50V Nichicon Cap at C1, beefed up ...I used a 4700uf 50V Nichicon Cap at C1, beefed up some of the resistors and switched OPAMPS to LM741 / UA741CN (44V.) Also, wire in a 20AWG wire between the ground side of R7 and R17. This drastically reduces the ripple.Urshurak776https://www.blogger.com/profile/05213857988677845713noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-6400555182708579022020-02-27T15:27:50.093+01:002020-02-27T15:27:50.093+01:00I would improve this kit by replacing U1, D8 with ...I would improve this kit by replacing U1, D8 with a TL431 and few resistors or a 78L12. This will improve thermal drift of D8. If you expect 2 Amps on the output, then the temperature in the case will change and output voltage along with it.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-2570509060077573342020-02-26T22:07:18.104+01:002020-02-26T22:07:18.104+01:00You can use the shunt and amplifier on the meter i...You can use the shunt and amplifier on the meter itself. It's a bit offset - since you don't have negative voltage - about 175mv, but for the purpose of current limiting it does not matter. A bit of adjusting of P2, R17, R18 should do the trick. There's a secondary benefit of this mod: you don't need the negative voltage rail, so instead of a big transformer you can use a switching PSU.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-31782703900022424802019-11-27T17:27:29.080+01:002019-11-27T17:27:29.080+01:00A 9 volt battery will have very short life with th...A 9 volt battery will have very short life with these voltmetersMiguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-31137948276936578062019-11-27T13:59:50.013+01:002019-11-27T13:59:50.013+01:00The problem with the 4th solution is, there is no ...The problem with the 4th solution is, there is no PFC in that multimeter's power supply, therefore it only features a PF of around 25%, that's too innefficient. A 9V battery might be an even better solution.Carloshttps://www.blogger.com/profile/04321316185438965268noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-17638769793461442112019-10-21T20:37:00.293+02:002019-10-21T20:37:00.293+02:00The mounting manual is easy to find online, for ex...The mounting manual is easy to find online, for example:<br /><br />https://img.banggood.com/file/products/201505080459530-30Vinstall.pdf<br /><br />If you have no output, check voltage at U1 output. It should be around 10 volts.<br /><br />Check also the negative rail for about -5 volts.<br /><br />If everything is ok, probably one or more of the operationals were damaged when you swapped the diodes. Replace them all.<br /><br />Good luck!Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-57788048235456361502019-10-20T18:24:05.160+02:002019-10-20T18:24:05.160+02:00Good day sir, I purchased the kit from Ali express...Good day sir, I purchased the kit from Ali express and I receive without manual. I installed the parts resistors, IC, capacitors and transistors in correct parts slot accept the zener diode. The 5.1v and 4148 I installed them mix at parts slot mean the slot for 5.1v is putting me an 1n4148 and I got nothing output voltage. I already corrected the same slot parts but no voltage in output again. I think the wrong installation create a damages in other parts? And if I correct, what and where? Any suggestions to check is appreciated.Anonymoushttps://www.blogger.com/profile/16145114640995660698noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-89154595300542421942019-04-06T02:02:25.301+02:002019-04-06T02:02:25.301+02:00The maximum reverse voltage for SB560 is only 60 v...The maximum reverse voltage for SB560 is only 60 volts. Too fair for my liking but it should work if your transformer does not put too much voltage.Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-62530991388221739812019-04-05T19:07:59.166+02:002019-04-05T19:07:59.166+02:00Instead of the 1N5408 Diodes, would SB560 work? I&...Instead of the 1N5408 Diodes, would SB560 work? I'm currently building this system in Multisim and doing some basic modifications. C1 @ 6800u is a great idea.Anonymoushttps://www.blogger.com/profile/04732679491713170224noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-39738311404492034322019-01-26T13:58:14.946+01:002019-01-26T13:58:14.946+01:00Something is very wrong if an operational amplifie...Something is very wrong if an operational amplifier gets hot. Check Q2 and Q4 wiring, also check if the supply rails have the right voltages. Good luck!Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-55822755104713351792019-01-26T12:26:12.937+01:002019-01-26T12:26:12.937+01:00Good day sir
I assembled kit as per the instructi...Good day sir <br />I assembled kit as per the instructions .after powering found the outputgoes to max later reduced to 1.3 v after that no more change same time u2 getting hot <br />I have changed u2 with new one still the problem remains<br />Check all components for cold soldering found ok <br />Please help me <br />Anonymoushttps://www.blogger.com/profile/01466200825603255420noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-7066344011211930002018-12-12T21:07:00.445+01:002018-12-12T21:07:00.445+01:00Thank you for your time and comment.Thank you for your time and comment.Halil İbrahimhttps://www.blogger.com/profile/07488293619881706380noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-45634988836774278272018-12-12T20:49:25.587+01:002018-12-12T20:49:25.587+01:00Check U3 and all associated components. Check also...Check U3 and all associated components. Check also for misplaced components, especially R17, R18, R19, R20 and R21. Good luck!Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-75056207001746479322018-12-12T12:48:09.272+01:002018-12-12T12:48:09.272+01:00I purschesed this circuit from Aliexpress. Without...I purschesed this circuit from Aliexpress. Without any load, it adjust voltage between defined limits. However, when I connect any device such as a rechargebale batter or a 12 V led lamp etc, it provides a current less than 30 mAmps. With a big load such as 12 V auto lamp, then it goes down to 0 V. What can I do?Halil İbrahimhttps://www.blogger.com/profile/07488293619881706380noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-21431428957985284912018-02-16T00:07:06.007+01:002018-02-16T00:07:06.007+01:00not-empty comment (-: no information though :-).not-empty comment (-: no information though :-).a khokhlovhttp://www.hotmail.comnoreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-29356964296283762192018-02-12T14:09:48.484+01:002018-02-12T14:09:48.484+01:00U3 output goes high in CV mode and low in CC mode....U3 output goes high in CV mode and low in CC mode. A pair of resistors and a NPN transistor should be enough to add a CV led.Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-50766218800115138352018-02-12T12:55:22.809+01:002018-02-12T12:55:22.809+01:00Good project! Would it be easy to add a CV led in ...Good project! Would it be easy to add a CV led in the circuit? It has a CC led but not a CV; how would you do it?<br />Mike ZS6AI<br />Anonymoushttps://www.blogger.com/profile/01155722025310272582noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-82237601498954777182017-11-30T17:13:50.914+01:002017-11-30T17:13:50.914+01:00I purchased two of these kits from Banggood recent... I purchased two of these kits from Banggood recently, with a view to using them to replace the board in my Farnell L30 PSU which has suddenly failed. It has a mixture of old pnp, npn, silicon and germanium transistors, but it has a nice analogue metering system.<br />I propose to disconnect the +ve end of the bridge rectifier from the board and introduce an LM317 regulator circuit to drop the 45V or so from the Farnell transformer to around 30V dc for the remainder of the board. I would leave C1 & R1 at the output of the LM317 regulator. I only need 500mA maximum current to match the Farnell unit's current-handling capability and as I rarely need voltages much above 20V, I could reduce the LM317s output voltage sufficiently to make replacement of the TL081s unnecessary.blacksmockhttps://www.blogger.com/profile/13637495886644773255noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-59850167104308029832017-09-13T17:24:16.130+02:002017-09-13T17:24:16.130+02:00Congratulations for your article, Miguel. It will ...Congratulations for your article, Miguel. It will save me a lot of valuable time when wiring a voltage and current meter in my Hiland power supply. I will go through the transformer solution.Anonymoushttps://www.blogger.com/profile/14861363994316900727noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-28078068396826398232017-08-04T17:24:04.723+02:002017-08-04T17:24:04.723+02:00You could benefit in this circuit from having a lo...You could benefit in this circuit from having a low value resistor of 0.2Ohm in series with the emitter of the pass transistor.Anonymousnoreply@blogger.com