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Ingyenes szabványos szállítás 9.9 $ feletti rendelés esetén
Visszatérítési politika
A termékek visszaküldését 40 napon belül elfogadjuk a termék átvételének dátumától számítva. A testreszabott termékeket nem lehet visszaküldeni vagy kicserélni. Az e-ajándék kártyával vásárolt termékek csak cserélhetők; a visszatérítés nem alkalmazható.
Ingyenes ajándék
Üdvözöljük a Roymall-ban, a prémium áruház ajándékok vásárlásának szakmai weboldalán. Nagyra értékeljük és köszönjük a támogatásodat, és hálánk jeléül extra izgalmat adunk a vásárlásaidhoz. Amikor nálunk vásárolsz, nemcsak kiváló minőségű termékeket kapsz, amelyek javítják az életminőségedet, hanem minden rendelésed mellé egy exkluzív ingyenes ajándékot is kapsz. Készen állsz a gyűjteményünk felfedezésére és a tökéletes ajándékok megtalálására? Böngéssz a prémium áruház termékeink között, add le a rendelésed, és várd az ingyenes ajándékod izgalmát, amely a vásárlásoddal együtt érkezik.
Szállítási politika
Keményen dolgozunk azon, hogy a rendelésedet követően biztonságosan kiszállítsuk a termékeket. A szállítási részleteket a visszaigazoló e-mailben kapod meg.A legtöbb esetben a rendeléseket 2 napon belül feldolgozzuk. Különleges körülmények között a késés a következő lehet: Ha szombaton, vasárnap vagy ünnepnapon rendelsz, a rendelésed 2 napot késik.Általában 5-7 munkanap (hétfőtől péntekig) szükséges, ha nincs késés a repülőjáratban vagy más környezeti tényezők miatt.Mivel szállítási szolgáltatásunk világszerte elérhető, a szállítási idő a helyzetedtől függ, így néhány napig is eltarthat, és ha távoli területen vagy országban élsz, kérjük, legyél türelemmel.
1. Visszatérítési és csere politika
Csak a roymall.com oldalon vásárolt termékeket fogadjuk vissza. Ha helyi disztribútornál vagy más kiskereskedőnél vásároltál, nem tudod visszaküldeni a terméket hozzánk.A végleges eladású termékeket vagy ingyenes ajándékokat nem lehet visszaküldeni.A visszaküldéshez a terméknek használatlannak és eredeti állapotában kell lennie. Eredeti csomagolásban kell lennie.Miután megkaptad tőlünk a visszaküldési utasításokat, csomagold be a visszaküldendő termékeket, és hagyd a csomagot a helyi postán vagy más futárnál.A visszaküldött vagy cserélt terméket 3-5 munkanapon belül feldolgozzuk, miután megkaptuk. A visszatérítést automatikusan feldolgozzuk és jóváírjuk az eredeti fizetési módodra.Nem fogadunk el visszaküldést vagy cserét, ha a termék egyedi gyártású, beleértve az egyedi méretet, színt vagy nyomtatást.További segítségre van szükséged? Lépj velünk kapcsolatba. service@roymall.com vagy Whatsapp: +8619359849471
2. Visszatérítési politika
Teljes visszatérítést vagy 100% bolti kreditet kapsz, miután megkaptuk és ellenőriztük a visszaküldött csomagot. A visszatérítést automatikusan feldolgozzuk és jóváírjuk az eredeti fizetési módodra.Kérjük, vedd figyelembe, hogy a szállítási költségek és minden vám vagy díj nem visszatéríthető. A további szállítási költségek nem visszatéríthetők, miután a csomagot kiszállítottuk. Felelős vagy ezen díjak fizetéséért, és nem tudunk eltekinteni tőlük, vagy visszatéríteni, még akkor sem, ha a rendelést visszaküldöd hozzánk.Ha bármilyen problémád van a visszatérítési folyamattal, lépj velünk kapcsolatba. service@roymall.com vagy Whatsapp: +8619359849471
Description:
This circuit voltage can be from 0 v, output current can be ma from 2 to 3 a continuously adjustable, set the output current, if the experiment circuit exceeds the current (including short circuit), the circuit protection immediately, not cause danger such as burning device, it is electronic manufacture"s right-hand man. Like making all kinds of audio circuit friend, due to the different working voltage and circuit have a headache, this circuit can also two series into a dual power supply, can meet the needs of all sorts of use. English manual: http://myosuploads3.banggood.com/products/20230706/20230706015646install.pdf Transformer: Product ID: 1210628
All straight inserted element, make easy, only an adjustable components ( used to adjust the voltage of 0 v )LED indicator for output over current, when the current exceeds the set data circuit protection, LED lighting, over load and short circuit protection Minimum current (2mA) under the measurable leds and zener diode
Notice: Power production belongs to the high voltage large current circuit, please be sure to carefully, otherwise may cause harm to the personal safety.
Package included:
1 x Adjustable DC Regulated Power Supply DIY Kit
Note:
The finished product is for reference only, and the parts may be inconsistent, which does not affect operation and use. If you need to add a heat sink and fan, follow the installation location as shown below. Note that you need to bring your own heat sink and fan, the package does not include a heat sink and fan.
ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...
ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...
ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...
The kit is really excellent.I made a variable bench power supply by using this kit.The detail project is on Instructables
https://www.instructables.com/id/DIY-Bench-Power-Supply/
https://youtu.be/p50oae_Nnq0
The kit is really excellent.I made a variable bench power supply by using this kit.The detail project is on Instructables
https://www.instructables.com/id/DIY-Bench-Power-Supply/
https://youtu.be/p50oae_Nnq0
The kit is really excellent.I made a variable bench power supply by using this kit.The detail project is on Instructables
https://www.instructables.com/id/DIY-Bench-Power-Supply/
https://youtu.be/p50oae_Nnq0
Tips:For questions about your order, place of delivery, product discount, taxation, delivery time, warranty, shipping, payment, exchange rate, and other questions unrelated to the product, please contact customer service.
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A part of the QA has been auto-translated.
0
Q:
If I used a transformer that already output is 24v DC, Will is Ok? Or will I lose something?
If I used a transformer that already output is 24v DC, Will is Ok? Or will I lose something?
Firstly check the main transformer out put voltage if the transformer is OK showing the required voltage then check the IC and other component including main four diode.
Firstly check the main transformer out put voltage if the transformer is OK showing the required voltage then check the IC and other component including main four diode.
Evidently it is to set the output voltage to 0v when the output potentiometer (10K Pot marked 'V' on the board) is in it's minimum position.
Have you not downloaded the PDF instructions for building this PSU??
I haven't built mine yet, but the PDF tells you all the info about it including the above setup method.
Evidently it is to set the output voltage to 0v when the output potentiometer (10K Pot marked 'V' on the board) is in it's minimum position.
Have you not downloaded the PDF instructions for building this PSU??
I haven't built mine yet, but the PDF tells you all the info about it including the above setup method.
Answered by Vince on 28/03/2021Helpful (0)
0
Q:
can I use a transformer with 34V AC output? And in which wise can modified the input circuit
can I use a transformer with 34V AC output? And in which wise can modified the input circuit
Answered by SRamakrishnan on 01/02/2025Helpful (0)
0
Q:
Hi, as soon as I connect a load of even a few milliamps, the D1047 overheats so much that you can't even touch it. I mounted a heatsink but no fan. Is it normal or can I do some special checks?
The LED never lights up. Thank you
Hi, as soon as I connect a load of even a few milliamps, the D1047 overheats so much that you can't even touch it. I mounted a heatsink but no fan. Is it normal or can I do some special checks?
The LED never lights up. Thank you
If all the components checked OK before assembly, the probable culprit is the (not powerful enough) transformer.
If all the components checked OK before assembly, the probable culprit is the (not powerful enough) transformer.
Answered by lanafina452 on 08/10/2020Helpful (0)
0
Q:
The datasheet indicates a maximum supply voltage of 30V for the TL081. Is there not a risk by supplying them with a rectified and filtered 24V AC voltage, i.e. a DC voltage of about 35V?
The datasheet indicates a maximum supply voltage of 30V for the TL081. Is there not a risk by supplying them with a rectified and filtered 24V AC voltage, i.e. a DC voltage of about 35V?
Este tem apenas 1 saída. O que tu queres é uma fonte simétrica, Busque por ( Fonte de alimentação variável dupla LM317 e LM337 )
This one has only 1 output. What you want is a symmetrical font, Search for ( Dual Variable Power Supply LM317 and LM337 )
Answered by TonBG248126253 on 10/07/2023Helpful (0)
0
Q:
I bought this product. i assembled it according instructions and checked a few times. I connected it to transformer with output 24AC but I can reach only 27,1V output voltage. Please, let me know what could be a problem and how it could be solved. Thanks.
I bought this product. i assembled it according instructions and checked a few times. I connected it to transformer with output 24AC but I can reach only 27,1V output voltage. Please, let me know what could be a problem and how it could be solved. Thanks.
Answered by SRamakrishnan on 01/04/2025Helpful (0)
0
Q:
My output is stuck at -0,34Vdc, and the overcurrent led is constantly on.
Turning the potentiometers or the trimmer does not help, output is always -3,4V.
I triple checked the components, and all seems right. I use a 24V transformer that can supply 3 amps too.
Anyone had similar problems?
My output is stuck at -0,34Vdc, and the overcurrent led is constantly on.
Turning the potentiometers or the trimmer does not help, output is always -3,4V.
I triple checked the components, and all seems right. I use a 24V transformer that can supply 3 amps too.
Anyone had similar problems?
I have had it happen, yes. The first time one of the op-amps was bad (always use sockets! Also, i recommend UA741's instead). The second time i blew the big white shunt resistor (It pays to keep spares). If you aren't using a heat sink and fan, i highly recommend that you do. I have about ten of these little kits and love building and using them! Hope this helps.
I have had it happen, yes. The first time one of the op-amps was bad (always use sockets! Also, i recommend UA741's instead). The second time i blew the big white shunt resistor (It pays to keep spares). If you aren't using a heat sink and fan, i highly recommend that you do. I have about ten of these little kits and love building and using them! Hope this helps.
Answered by rupe01 on 12/12/2020Helpful (0)
0
Q:
What are the two white connectors for?? Where do they connect??? Input/output, or something else??
What are the two white connectors for?? Where do they connect??? Input/output, or something else??
os 2 conectores brancos são para a opção de conexão dos potenciômetros de regulagem de tensão e corrente. caso não queira instalar diretamente ao circuito.
The 2 white connectors are for the connection option of the voltage and current regulating pots. In case you don't want to install directly to the circuit.
Answered by BG234445611 on 29/01/2021Helpful (0)
0
Q:
hi I recently got one of these power supply kits and assembled it. It will only output a max 24volt. The input voltage is as required. Can this be increased as there is no instructions or diagram?, also the led lights up even with no load but glows much brighter when set current is exceeded. is this normal operation or have I a problem? as it does work ok otherwise.
hi I recently got one of these power supply kits and assembled it. It will only output a max 24volt. The input voltage is as required. Can this be increased as there is no instructions or diagram?, also the led lights up even with no load but glows much brighter when set current is exceeded. is this normal operation or have I a problem? as it does work ok otherwise.
Low output voltage has 2 main reasons. 1) Transformer not powerful enough. To sustain 30VDC at 3ADC, the transformer must output at least 30x3=90W. This is a rather stringent requirement that not all transformers can meet. 2) PCB traces from filter capacitor to power transistor to output are too thin to carry that 90W. This is a design flaw that can be overcome by reinforcing them with external wiring. Current-limiting LED always on probably because corresponding potentiometer not at fully-clockwise position to disable current-limiting function.
Low output voltage has 2 main reasons. 1) Transformer not powerful enough. To sustain 30VDC at 3ADC, the transformer must output at least 30x3=90W. This is a rather stringent requirement that not all transformers can meet. 2) PCB traces from filter capacitor to power transistor to output are too thin to carry that 90W. This is a design flaw that can be overcome by reinforcing them with external wiring. Current-limiting LED always on probably because corresponding potentiometer not at fully-clockwise position to disable current-limiting function.
Answered by lanafina452 on 08/09/2020Helpful (0)
0
Q:
There is a LM7824 on the circuit board which is not in the parts list or the schematic diagram. Please explain and correct.
There is a LM7824 on the circuit board which is not in the parts list or the schematic diagram. Please explain and correct.