--- product_id: 1298627 title: "KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade…" brand: "korad" price: "COP 1275654" currency: COP in_stock: true reviews_count: 13 category: "Korad" url: https://www.desertcart.co/products/1298627-kd3005d-precision-variable-adjustable-30v-5a-dc-linear-power-supply store_origin: CO region: Colombia --- # Adjustable 0-30V, 0-5A output Smart cooling fan with auto speed Dual 4-digit LED displays KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… **Brand:** korad **Price:** COP 1275654 **Availability:** ✅ In Stock ## Summary > ⚡ Power your projects with precision and peace of mind! ## Quick Answers - **What is this?** KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… by korad - **How much does it cost?** COP 1275654 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/1298627-kd3005d-precision-variable-adjustable-30v-5a-dc-linear-power-supply) ## Best For - korad enthusiasts ## Why This Product - Trusted korad brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Power Flexibility:** Seamlessly switch between 110V and 220V inputs to match your workspace anywhere in the world. - • **Lock & Load Safety:** Panel lock feature prevents accidental setting changes—perfect for busy labs or shared workspaces. - • **Whisper-Quiet Cooling:** Intelligent fan adjusts speed based on load, keeping the unit cool and silent during marathon sessions. - • **Built to Last & Protect:** Robust circuit protection guards against overload, short circuit, and overheating—work worry-free. - • **Precision at Your Fingertips:** Dual 4-digit LED displays deliver ultra-clear voltage and current readings for exact control. ## Overview The KORAD KD3005D is a compact, lab-grade DC power supply offering adjustable 0-30V and 0-5A output with dual 4-digit LED displays. It features automatic switching between mA and A readings, built-in circuit protections, and a smart cooling fan that adapts to workload. Designed for professional and hobbyist use, it supports 110/220V input and includes safety features like panel lock and grounding, making it a reliable, long-lasting choice for precision electronics work. ## Description Product description The KD-Series of benchtop power supplies from Korad Technology is packed with features at a cost that can't be beat! This heavy duty signal-channel linear power supply features a bright and easy to read 4-digit LED screen to display the voltage and current values. As well as a panel lock feature to help prevent unwanted changes. The constant voltage and current settings are delivered with low ripple and noise, high reliability and high accuracy. Perfect for use in labs, colleges, and production environments where continuously adjustable. Forget lower cost 3-digit power supplies with poor accuracy and start working smarter with Korad. Over-Current Protection Built-in over-current protection function. The KD-Series also features precise rotary encoders for dialing in the exact voltage and current settings for your project. Control Panel Lock The control panel can be easily locked to prevent unwanted changes by pushing and holding the voltage knob until the "LOCK" LED lights on the display. Bright 4-Digit LED Display Precise readout that is legible from any angle on your workbench. The four digit LED display tells you exactly what the unit is outputting and what settings are currently active on the front panel. Switchable Voltage & Programmable The unit voltage is easily switchable from 110V to 220V on the rear panel. There are also USB and RS232 connections for programmable control via PC computer software. Korad KD3005D Power Supply About the Manufacturer KORAD TECHNOLOGY CO., LTD is a professional and new-style science and technology enterprise based on developing digital control & programmable DC power supplies, digital control & programmable DC electronic load, high-power power supplies, and switching mode power supplies, which are the main products of KORAD.And KORAD have been specializing in the research of the power supply industry and the engineers have very rich experience in power supplies. KD3005D Benchtop Power Supply Popular Applications Automatic Testing in the Production Line School Laboratory Repairing Research & Development Quality Control Aging Test 4-digit display Intelligent temperature-controlled fan Compact design 10 mV /1 mA resolution Low noise and ripple Review: Nice supply for the price - Easy to use compact supply for the hobbyist bench. Actual dimensions are approximately 10.5" deep X 4.4" wide X 6.5" high... dimensions stated in the description are incorrect (may be that of the box). I bought 2 of the supplies so that I might work with circuits that require + and - voltages. The two units stack nicely and take up very little space on the corner of my workbench. While voltage metering is quite accurate, current readings may be a bit off on some units. In one test, I set up a 1 amp current limit on both supplies, and connected them to 3 ohm 5% power resistors. Current delivered to the two resistors, measured with a Tektronix DMM850 was quite close to the set value, measuring 1.003 amps from the upper supply in my stack and 0.994 amps from the lower unit...very accurate indeed! However, the *current reading* of the upper unit was not as accurate, indicating that the supply was putting out 1.062 amps, while the bottom unit was very close at an indicated 1.001 amps. This is perhaps not quite "lab grade" performance, but good enough for most hobby applications. I did discover one weak point in the protection scheme of the unit... while it is well protected against shorts and over temperature conditions, one must be very careful not to reverse connect to a battery capable of delivering much current. When charging and testing an 18 volt B&D battery pack, I accidentally reverse connected one unit and killed the output... it did not reset even with a power off cycle. A protection diode in the output of the supply had shorted, which did indeed protect the supply from distruction. After the diode, a 1N5480 was replaced, the unit functioned perfectly, but I might not have been so fortunate if I had reverse connected the supply to a higher current source, such as an automobile battery. Fyi, the protection diode is located on the front board very near the output terminals, so about 10-15 minutes of disassembly is required to get to it. Review: Perfect home supply - I looked at a lot of supplies and bought this one based on the reviews. As a retired engineer, I'm used to using the high-end stuff, but $500+ is a little much for home use. The $30-$50 units seemed too cheap and the reviews certainly reflect that. The first thing I did when I got this was to pull the cover off. I was impressed with the assembly. Good practice was used. The cables are laced (always a good sign of care being taken), the transformer is huge and the heat sinking looks good. I don't have access to a schematic, so there is no way to evaluate the design, but the innards look great. The controls exceeded my expectations and are very easy to use. The voltage displays in units of .01V and current in units of .001A. Of course, the accuracy is not that good (and doesn't need to be) but you can tweak the settings easily for fine control as needed. To adjust either, just turn the knob. Pressing the knob changes which digit it's changing (10's of volts, 1's of volts, 0.1's of volts or 0.01's of volts). Ditto for current. Note that the knob clicks but it isn't always perfect. So, for instance, to change a setting on the fly, I may select the next unit down and come at the new setting by using 10 clicks instead of one. I'll describe how to use the supply in constant voltage mode. True constant current mode is rarely used, so I won't spend any time on that. To start out, unhook all the outputs. The GND terminal is nothing more than earth ground carried though from the AC line card. It is usually good practice to connect the ground to whatever is consider "common". (Yes, I know about ground loops and the need to sometimes avoid them, but for digital work that is rarely an issue). For most of what we do, common is the "-" post, so hook it to ground. This is easy to do by using some hookup wire and making a jumper using the holes in the posts that you see when you unscrew them a little ways. Now turn on the supply and set the voltage to what you need (for example, 5.0V). Adjust the current to something you think is perhaps twice the expected current needed. This will help protect your circuitry in case something is hooked up wrong. If you now press and hold the current knob until the OCP light comes on, you will set the supply to shut down if the current limit is exceeded. If you don't do this and too much current is being drawn, the supply will enter constant current mode and just reduce the voltage to whatever is needed to push out the current set by the current limit adjustment. If this is caused by an incorrect hookup, you may at this point be frying your circuit. OCP will help prevent that by shutting down the supply. You may still end up blowing something out, but the chances are less. If the supply shuts down, you can start it up again by just tweaking the voltage knob a bit. After things are set up, press and hold the voltage knob until the panel lock comes on. This will prevent anyone (such as little curious hands) from accidently changing your settings. The meters are dual purpose. When you are turning a knob, they show the voltage or current limit setting. After a moment, they go back to reading out the current and voltage being output from the supply. I haven't evaluated parameters like regulation, accuracy, ripple, etc. If I see anything unexpected I'll update this post. Just remember the meters are not accurate to 4 digits but are pretty good (better than 1%). There is utility in having more resolution than precision. For instance, you may want to look for small current changes. My hat's off to the designers for setting them up this way. It is useful if you understand the limitations. I think it is good practice not to push any low priced supply to the design limit. I bought the 5amp model with the intention of never using it to supply more than a few amps. Current is the killer for supplies and being conservative will help it last a long time, I hope. ## Features - Compact Design with Dual 4 Digit LED Displays and Digital Controls - Switchable power input 110/220v - Circuit protection for over load, short circuit and over temperature. - Automatic switching between mA and A display ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00FPU6G4E | | Best Sellers Rank | #41,554 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #24 in Lab Power Supplies #43 in Life Science Supplies | | Brand | KORAD | | Built-In Media | 5 Amp Test Leads, KD3005D Power Supplu, Power Cord, User Manual | | Compatible Devices | Personal Computer | | Connector Type | Banana Jack (DC Output), AC Plug (AC Input) | | Connector Type Used on Cable | Banana Jack (DC Output), AC Plug (AC Input) | | Cooling Method | Air | | Current Rating | 5 Amps | | Customer Reviews | 4.4 out of 5 stars 365 Reviews | | Form Factor | Standalone | | Global Trade Identification Number | 00022099136323 | | Item Dimensions | 14 x 10 x 10 inches | | Item Type Name | Power Supply | | Item Weight | 9 Pounds | | Manufacturer | Korad | | Maximum Input Voltage | 121 Volts (AC) | | Mfr Part Number | KD3005D | | Minimum Input Voltage | 110 Volts | | Model Name | KD3005D | | Model Number | KD3005D | | Output Wattage | 300 Watts | | System Bus Connector Type | 6 Pin | | UPC | 787721204039 | | Unit Count | 1.0 Count | | Wattage | 150.00 | ## Product Details - **Brand:** KORAD - **Compatible Devices:** Personal Computer - **Connector Type:** Banana Jack (DC Output), AC Plug (AC Input) - **Cooling Method:** Air - **Form Factor:** Standalone - **Item Weight:** 9 Pounds - **Item dimensions L x W x H:** 14 x 10 x 10 inches - **Model Name:** KD3005D - **Output Wattage:** 300 Watts - **Wattage:** 150.00 ## Images ![KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… - Image 1](https://m.media-amazon.com/images/I/61kld3kAxFL.jpg) ![KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… - Image 2](https://m.media-amazon.com/images/I/71wk9eNC09L.jpg) ![KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… - Image 3](https://m.media-amazon.com/images/I/617H8nhr2gL.jpg) ![KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… - Image 4](https://m.media-amazon.com/images/I/614bTUHbC5L.jpg) ![KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… - Image 5](https://m.media-amazon.com/images/I/61EjXxgJbtL.jpg) ## Questions & Answers **Q: Is this the "fixed" model? The one EEVblog tested in July failed, but apparently Korad has made improvements. See http://www.eevblog.com/forum/blog/eevblog-404-korad-psu-followup/** A: I ordered on Oct. 5, 2020. Mine appears to be another revision. The power board has one large cap, but newer transistors with a different layout and with surface mount components. The interface board appears to be another revision too. Both boards appear different than the original board and the revision shown on EEVBlog. Have yet to test this, though. **Q: it comes with the wires?** A: Yes it comes with hookup adapters banana plug to alligator clips and the power cord. **Q: Does this supply have programmable current limiting? Can you, for example, set a limit of 500mA?** A: It isn't really programmable by my definition, but it has a manual control that allows the course/fine limiting of current. (The knob on the right) It is also a push to hold your settings button. **Q: Does anyone know how to put this into constant current mode? I don't know if I'll ever actually use it this way but I am curious to see if it works.** A: Set what you want for the current. Then set your voltage 3 volts higher than what you require. It should go into constant current mode. If not, slowly increase the voltage until you go into constant current mode. The light next to CC should be lit. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Nice supply for the price *by J***H on March 28, 2016* Easy to use compact supply for the hobbyist bench. Actual dimensions are approximately 10.5" deep X 4.4" wide X 6.5" high... dimensions stated in the description are incorrect (may be that of the box). I bought 2 of the supplies so that I might work with circuits that require + and - voltages. The two units stack nicely and take up very little space on the corner of my workbench. While voltage metering is quite accurate, current readings may be a bit off on some units. In one test, I set up a 1 amp current limit on both supplies, and connected them to 3 ohm 5% power resistors. Current delivered to the two resistors, measured with a Tektronix DMM850 was quite close to the set value, measuring 1.003 amps from the upper supply in my stack and 0.994 amps from the lower unit...very accurate indeed! However, the *current reading* of the upper unit was not as accurate, indicating that the supply was putting out 1.062 amps, while the bottom unit was very close at an indicated 1.001 amps. This is perhaps not quite "lab grade" performance, but good enough for most hobby applications. I did discover one weak point in the protection scheme of the unit... while it is well protected against shorts and over temperature conditions, one must be very careful not to reverse connect to a battery capable of delivering much current. When charging and testing an 18 volt B&D battery pack, I accidentally reverse connected one unit and killed the output... it did not reset even with a power off cycle. A protection diode in the output of the supply had shorted, which did indeed protect the supply from distruction. After the diode, a 1N5480 was replaced, the unit functioned perfectly, but I might not have been so fortunate if I had reverse connected the supply to a higher current source, such as an automobile battery. Fyi, the protection diode is located on the front board very near the output terminals, so about 10-15 minutes of disassembly is required to get to it. ### ⭐⭐⭐⭐⭐ Perfect home supply *by A***E on April 29, 2014* I looked at a lot of supplies and bought this one based on the reviews. As a retired engineer, I'm used to using the high-end stuff, but $500+ is a little much for home use. The $30-$50 units seemed too cheap and the reviews certainly reflect that. The first thing I did when I got this was to pull the cover off. I was impressed with the assembly. Good practice was used. The cables are laced (always a good sign of care being taken), the transformer is huge and the heat sinking looks good. I don't have access to a schematic, so there is no way to evaluate the design, but the innards look great. The controls exceeded my expectations and are very easy to use. The voltage displays in units of .01V and current in units of .001A. Of course, the accuracy is not that good (and doesn't need to be) but you can tweak the settings easily for fine control as needed. To adjust either, just turn the knob. Pressing the knob changes which digit it's changing (10's of volts, 1's of volts, 0.1's of volts or 0.01's of volts). Ditto for current. Note that the knob clicks but it isn't always perfect. So, for instance, to change a setting on the fly, I may select the next unit down and come at the new setting by using 10 clicks instead of one. I'll describe how to use the supply in constant voltage mode. True constant current mode is rarely used, so I won't spend any time on that. To start out, unhook all the outputs. The GND terminal is nothing more than earth ground carried though from the AC line card. It is usually good practice to connect the ground to whatever is consider "common". (Yes, I know about ground loops and the need to sometimes avoid them, but for digital work that is rarely an issue). For most of what we do, common is the "-" post, so hook it to ground. This is easy to do by using some hookup wire and making a jumper using the holes in the posts that you see when you unscrew them a little ways. Now turn on the supply and set the voltage to what you need (for example, 5.0V). Adjust the current to something you think is perhaps twice the expected current needed. This will help protect your circuitry in case something is hooked up wrong. If you now press and hold the current knob until the OCP light comes on, you will set the supply to shut down if the current limit is exceeded. If you don't do this and too much current is being drawn, the supply will enter constant current mode and just reduce the voltage to whatever is needed to push out the current set by the current limit adjustment. If this is caused by an incorrect hookup, you may at this point be frying your circuit. OCP will help prevent that by shutting down the supply. You may still end up blowing something out, but the chances are less. If the supply shuts down, you can start it up again by just tweaking the voltage knob a bit. After things are set up, press and hold the voltage knob until the panel lock comes on. This will prevent anyone (such as little curious hands) from accidently changing your settings. The meters are dual purpose. When you are turning a knob, they show the voltage or current limit setting. After a moment, they go back to reading out the current and voltage being output from the supply. I haven't evaluated parameters like regulation, accuracy, ripple, etc. If I see anything unexpected I'll update this post. Just remember the meters are not accurate to 4 digits but are pretty good (better than 1%). There is utility in having more resolution than precision. For instance, you may want to look for small current changes. My hat's off to the designers for setting them up this way. It is useful if you understand the limitations. I think it is good practice not to push any low priced supply to the design limit. I bought the 5amp model with the intention of never using it to supply more than a few amps. Current is the killer for supplies and being conservative will help it last a long time, I hope. ### ⭐⭐⭐⭐ Excellent supply for users with higher current needs *by R***B on November 3, 2015* This is a good supply if you need tight voltage control at substantial amperage with a current-limiting feature. Pros: - Really does adjusts from 0V to 30V in 1 mV (!!!) increments. - Output voltage matches my DMM very closely. - Easy to monitor the current drawn by your load to mA precision. This is a really nice feature. - Red LEDs are bright and easily visible even in sunlight. - The current-limiting feature is very nice. - (+) terminal is adjacent to (-) instead of GND. This is a personal preference, but I like this layout. Pushing the voltage control knob sets the power of ten to which the knob applies. This allows you to set the voltage very finely but also means you can go from 10 V -> 30 V instead of 10V -> 12V if you are not paying attention. (It tries to make you pay attention by flashing the digit that will change.) Personally I'd prefer a modeless control that adjusted output by +/- 100 mV per click to reduce the likelihood of user error, but if you don't make user errors you will love the ability have fine control over 5 decades. The supply has a beefy transformer and a fan. Linear supplies are not very efficient so they throw off a lot of heat. The airflow design is quite good, with fan placement designed to ensure airflow directly over the power transistors. I found the fan noise too much for my personal tastes. I measured 57 dB SPL (unweighted) with an iPhone aligned with back of unit and 43 dB @ 1 meter distance. (This was using Faber Acoustical's DB app on an iPhone, background level 38 dB.) Because I require the power supply to be on all the time and at arm's reach while I work, I had to return it. Doug at SRA Soldering Products thought my unit might have a faulty fan feedback circuit, but both my units (I bought two at the same time) behaved the same. Other users have said they aren't bothered by the fan noise, so I suspect I am just unreasonably demanding about fan noise. I measured the following power usage by the supply when driving a digital device that draws about 3.5W. Supply usage measured using a "Kill-o-Watt" power meter: device draws 160mA @ 20V (3.2W) supply draws 21W (15%) device draws 150mA @ 22V (3.3W) supply draws 24W (14%) device draws 140mA @ 24V (3.4W) supply draws 24W (14%) device draws 136mA @ 26V (3.5W) supply draws 24W (15%) device draws 133mA @ 28V (3.7W) supply draws 29W (13%) On and unloaded, the supply draws from 12W @0V to 16W @30V. Note I am only using < 5% of the maximum current output of the supply, not a good fit for a linear supply with a 5A rating. I probably should have purchased a passively-cooled supply with output current more in line with my needs. The supply is solidly constructed and well-designed for users with higher current requirements. ## Frequently Bought Together - KORAD KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade… - BOJACK 1000 Pcs 25 Values Resistor Kit 1 Ohm-1M Ohm with 5% 1/4W Carbon Film Resistors Assortment --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co/products/1298627-kd3005d-precision-variable-adjustable-30v-5a-dc-linear-power-supply](https://www.desertcart.co/products/1298627-kd3005d-precision-variable-adjustable-30v-5a-dc-linear-power-supply) --- *Product available on Desertcart Colombia* *Store origin: CO* *Last updated: 2026-05-26*