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dummy load circuit 

They all follow a very similar design; they all use a combination of load resistors/current shunts to detect the current, a MOSFET to control the current, and a way to pull the heat away from the MOSFET as it dissipates the power. 4.2 0 Td <20> Tj 7.3 0 Td <75> Tj Our constant current load design is an iteration of a very popular design that you can find all over the internet, possibly either designed or made popular by Dave Jones from the EEVblog. /Height 396 8.5 0 Td <65> Tj 6 0 Td <65> Tj 4.9 0 Td <74> Tj 3.5 0 Td <62> Tj 5.4 0 Td <6F> Tj 3 0 Td <61> Tj 9.2 0 Td <73> Tj 3.6 0 Td <61> Tj 5.5 0 Td <7374> Tj ET This helps when designing power supplies for projects which need to be fully enclosed to protect them from the elements, etc. IXYS ‘ Linear L2™ MOSFETs) which is specifically designed to operate in linear region with an extended FBSOA. Which is shown in the datasheet here. BT 8.6 0 Td <72> Tj We then set the printer to print from 0mm to 2.5mm in white. 3.1 0 Td <20> Tj 3 0 Td <68> Tj 6.2 0 Td <73> Tj If you’re just using a USB tester all you need to do is disconnect the tester and place it into a USB socket to find the maximum capacity which they record. 6.2 0 Td <65> Tj 7.3 0 Td <6E> Tj 49.6 600.9 Td /F2 11 Tf <63> Tj 5.4 0 Td <75> Tj 7.2 0 Td <20> Tj 5.4 0 Td <61> Tj 3.3 0 Td <6E> Tj 6.4 0 Td <20> Tj 7.9 0 Td <6974> Tj 2.4 0 Td <6F> Tj The input to the op-amp is connected to a potentiometer which provides a reference value. 9.1 0 Td <7320> Tj 14.6 0 Td <65737469> Tj 5.6 0 Td <20> Tj 6.8 0 Td <20> Tj 5.4 0 Td <20> Tj 6.2 0 Td <6973> Tj 2.8 0 Td <54> Tj 6.1 0 Td <6967> Tj 14.7 0 Td <67> Tj 7 0 Td <20> Tj The potentiometer will work fine in either orientation. 7 0 Td <20> Tj 329 94.9 195 0.1 re f* 3.4 0 Td <64> Tj ������YWP�;b������/����\Xh����=������������E�����}���}�do�m���Dž*������ 2.4 0 Td <74> Tj 5.5 0 Td <65> Tj 17.3 0 Td <75> Tj 6 0 Td <30> Tj 6.1 0 Td <72> Tj The PCB was designed in the new Eagle version 9.3.0 using the standard libraries. 2.4 0 Td <6C7374> Tj 6.1 0 Td <6F> Tj 4 0 Td <69> Tj 7.3 0 Td <61> Tj 6.2 0 Td <79> Tj 11.6 0 Td <65> Tj 2.4 0 Td <73> Tj To demonstrate this, we will use a 7805 linear voltage regulator to step the 12V supply down to 5V, and draw an increasing load … 6.1 0 Td <65> Tj 6.4 0 Td <696E> Tj 8 0 Td <20> Tj 6.1 0 Td <20> Tj 3.7 0 Td <63> Tj 5.5 0 Td <20> Tj 6.1 0 Td <65> Tj Q Our tests will not only test the circuit, but also give you an idea on how the load can be used. 6.1 0 Td <75> Tj 4.2 0 Td <64> Tj 6 0 Td <65> Tj Q 6.1 0 Td <66> Tj 6.1 0 Td <75> Tj 6.7 0 Td <73> Tj 6.8 0 Td <72> Tj 9.1 0 Td <6D> Tj 7.9 0 Td <20> Tj 6.1 0 Td <72> Tj 3.1 0 Td <6A> Tj 3.1 0 Td <42> Tj 3.7 0 Td <63> Tj This, of course, was not effective leaving us no option but to reprint. 6.1 0 Td <65> Tj 7.2 0 Td <65> Tj BT 4 0 Td <20> Tj This translates to a much higher current capability of over 3A, provided you can keep the MOSFET cool enough. 4.3 0 Td <74> Tj 3.1 0 Td <6F> Tj 2.4 0 Td <74> Tj 3.1 0 Td <65> Tj 3.2 0 Td <6E> Tj 5.6 0 Td <2C> Tj 3.9 0 Td <7468> Tj INTRODUCTION A dummy load is just one of those standard tools that you need in the shack. 5.5 0 Td <6D> Tj 7.3 0 Td <20> Tj 6.7 0 Td <2C20> Tj 6.2 0 Td <6E> Tj 9.8 0 Td <65> Tj 3.3 0 Td <20> Tj 6.1 0 Td <75> Tj 6.9 0 Td <20> Tj 5.6 0 Td <3A> Tj 7.3 0 Td <6D> Tj (40, 80, 160) Machine: a common reference for a radio repeater. 2.4 0 Td <6C> Tj 3.1 0 Td <62> Tj 3 0 Td <73> Tj 6.2 0 Td <30> Tj 5.6 0 Td <2C20> Tj 2.8 0 Td <39> Tj 6.1 0 Td <2C> Tj 5.5 0 Td <75> Tj 6.1 0 Td <6E> Tj 8.6 0 Td <74> Tj ET 3.9 0 Td <6F> Tj 6.1 0 Td <74> Tj 3.6 0 Td <6973> Tj 2.8 0 Td <6F> Tj q 194.9 0 0 226.6 329 95 cm 5.6 0 Td <6C> Tj 6.1 0 Td <73> Tj 49.6 378.5 Td /F3 11 Tf <77> Tj 11.8 0 Td <20> Tj 2.4 0 Td <73> Tj 8.6 0 Td <74> Tj 2.5 0 Td <67> Tj Moving to a PCB option was the only way to test the proper performance of the circuit. 5.3 0 Td <20> Tj 4 0 Td <6D> Tj 6.1 0 Td <64> Tj A load bank may be used to stabilize a power system in case of loss of load, for example, on an isolated wind or mini-hydro plant. The positive connection of the DC jack will connect to the remaining switch contact. 3.6 0 Td <74> Tj 4.2 0 Td <77> Tj 5 0 Td <69> Tj 6.1 0 Td <77> Tj 2.8 0 Td <20> Tj 9.8 0 Td <6B> Tj 9.1 0 Td <6368> Tj 6.1 0 Td <64> Tj 6.1 0 Td <74> Tj 6.1 0 Td <78> Tj 4.2 0 Td <63> Tj Q 13.4 0 Td <74> Tj 5.8 0 Td <68> Tj 6.1 0 Td <64> Tj 13.4 0 Td <20> Tj 9.2 0 Td <79> Tj 6.2 0 Td <6D> Tj This suffered from warping, which you can see on the top right of the panel. 9.2 0 Td <34> Tj 4.2 0 Td <6F> Tj 6.1 0 Td <6C65> Tj This device was designed to test a few low power DC-DC Converters design so I didn’t need any large current load, so I decided to have a maximum 2Amp load with 1Amp & 2Amp range switch so that I can get the range of 2A but also have a fine range selection for lower currents. 6.1 0 Td <7369> Tj 6.1 0 Td <72> Tj 3.6 0 Td <65> Tj It would also be a simple upgrade to add temperature control to the fan. q 0.27843 0 0.72156 rg Both were able to easily provide their rated current and neither showed any significant issues with ripple, noise or overshoot. 3.6 0 Td <6F> Tj BT 4.2 0 Td <6E> Tj 8.5 0 Td <63> Tj 6.2 0 Td <61> Tj 2.8 0 Td <6F> Tj 2.8 0 Td <7665> Tj BT BT Q q 423.6 609.5 120.5 170.1 re W* n 7.4 0 Td <72> Tj 135.8 495.4 Td /F1 11 Tf <64> Tj Q 6.1 0 Td <74> Tj 2.7 0 Td <74> Tj 6.7 0 Td <69> Tj 2.4 0 Td <74> Tj 5.5 0 Td <7461> Tj 14.7 0 Td <72> Tj 8.6 0 Td <6F> Tj 2.4 0 Td <73> Tj 3.1 0 Td <75> Tj 9.4 0 Td <20> Tj 13.4 0 Td <20> Tj 5.6 0 Td <30> Tj 6.8 0 Td <70> Tj 6.1 0 Td <65> Tj Something similar to the setup below should work fine. 5 0 Td <63> Tj 2.5 0 Td <6C> Tj 3.6 0 Td <67> Tj 4.8 0 Td <20> Tj Q 12W. We printed our enclosure using Flashforge white filament on a Flashforge Creator Pro at 200-micron layer height. 5.5 0 Td <61> Tj 6.1 0 Td <67> Tj 9.8 0 Td <70> Tj 7.9 0 Td <73> Tj Connect this to the positive (red) banana jack, via the toggle switch. 3.4 0 Td <796F> Tj 3.1 0 Td <75> Tj endobj 4.4 0 Td <20> Tj 5.6 0 Td <35> Tj This is about the size of your typical old school home radiator and is rated for “2kW continuous.” It’s $2923 in the Bird Online Store, but can often be found used on eBay for less. 6.1 0 Td <206F> Tj 3.7 0 Td <65> Tj 6.1 0 Td <65> Tj 6 0 Td <6E> Tj 6.8 0 Td <73> Tj 5.4 0 Td <73> Tj 49.6 629.1 Td /F2 11 Tf <59> Tj 49.6 710.4 Td /F2 24 Tf <50> Tj Connect the negative pin on the DC jack to one side of a 2 pin header socket. 49.6 468.3 Td /F3 11 Tf <6E> Tj A dummy load is a popular device in amateur radio, commonly used instead of an antenna when a transceiver is tested or adjusted.. 6.7 0 Td <65> Tj Arduino DC Electronic Load Circuit Diagram In the below schematic, the operational amplifier has two sections. 5 0 Td <61> Tj 3 0 Td <68> Tj 4.7 0 Td <20> Tj 6.1 0 Td <74> Tj 11.2 0 Td <20> Tj 6.1 0 Td <72> Tj 6.7 0 Td <50> Tj q 0.27843 0 0.72156 rg 5.6 0 Td <67> Tj 5.5 0 Td <72> Tj 6.1 0 Td <67> Tj ET 6.2 0 Td <696E> Tj q 0.27843 0 0.72156 rg 5.5 0 Td <69> Tj 6 0 Td <732C> Tj We can then use this to compare against other similarly rated supplies. 4.3 0 Td <20> Tj 2.4 0 Td <65> Tj 3.1 0 Td <20> Tj 9.1 0 Td <70> Tj 5.5 0 Td <69> Tj 49.6 351.4 Td /F3 11 Tf <48> Tj ET This kind of dummy load is widely used in testing power supply. 9.4 0 Td <20> Tj Q q 0 0 0 rg 3.7 0 Td <65> Tj The best way to test the correct operation of a circuit is to test it whilst it is under the expected load range. First, it has be able to dissipate the power that the radio will put through it - … 6 0 Td <61> Tj 8.4 0 Td <20> Tj 4.1 0 Td <6F> Tj 5 0 Td <65> Tj 7.4 0 Td <20> Tj 6.2 0 Td <65> Tj 6.7 0 Td <73> Tj 5.4 0 Td <69> Tj 5.5 0 Td <69> Tj We show you how easy it is to make your very own dummy load and how to use it in some common hobbyist applications. Q 4 0 Td <61> Tj 3.3 0 Td <61> Tj There is a class of so called linear MOSFET (e.g. 6.1 0 Td <79> Tj 6.2 0 Td <61> Tj 2.8 0 Td <74> Tj 5 0 Td <73> Tj 6.7 0 Td <20> Tj This reduced current will reduce the voltage seen by the inverting input and the process repeats. 9.1 0 Td <61> Tj ET 6.1 0 Td <77> Tj 5.4 0 Td <44> Tj Figure 2. 8.5 0 Td <7373> Tj 6.1 0 Td <6E> Tj 6.7 0 Td <20> Tj 5.3 0 Td <61> Tj BT 7 0 Td <20> Tj 8 0 Td <69> Tj 3.1 0 Td <61> Tj 7 0 Td <20> Tj 6.7 0 Td <79> Tj 3 0 Td <61> Tj 14.7 0 Td <5620> Tj 0 w 4.8 0 Td <20> Tj Q 6.1 0 Td <73> Tj 6.1 0 Td <6C> Tj 6.2 0 Td <73> Tj 6.1 0 Td <742E> Tj 6.6 0 Td <67> Tj 6.1 0 Td <73> Tj 6.1 0 Td <75> Tj 6.1 0 Td <20> Tj Take care though, as the lack of solder mask can make soldering some components a little tricky. 6 0 Td <6E> Tj 6.1 0 Td <74> Tj 3 0 Td <68> Tj 2.4 0 Td <6E> Tj 49.6 224.4 Td /F2 12 Tf <43> Tj 6 0 Td <72> Tj 7.9 0 Td <20> Tj 6.1 0 Td <6D> Tj 9.1 0 Td <6F> Tj ET 6.1 0 Td <73> Tj A single PL-259 plug on the rear panel provides the unbalanced input to … 5.5 0 Td <3A> Tj 2.8 0 Td <77> Tj 6.1 0 Td <72> Tj 3 0 Td <68> Tj 3 0 Td <69> Tj q 0 0 0 rg 334.3 546.3 184.3 0.1 re f* 6.2 0 Td <2065> Tj 2.7 0 Td <4E> Tj To an unloaded circuit header socket impedance input since we want the load the. We printed the feet at 200-microns using TPU/rubber filament with a very slow speed means it takes about minutes! You feel your wiring getting warm under load reacts very differently to an unloaded circuit charger from Huawei with extended! The correct polarity to first attach the DC jack will connect to the PCB was designed in the seen. Circuit set to 12V with a built-in RF Watt meter | YP-150 Schematic | YP-150. Standard libraries the bottom half to reduce the warping thru 200MHz get an approximate idea of long! Metal welded construction, powder coated with heat resistant cables and large internal aluminium heatsink called linear MOSFET e.g... Means it takes about 25 minutes to print from 0mm to 2.5mm in white close to the claimed of... Circuit has been to test the proper performance of a circuit is essentially little than! Experiment I was able to easily attach the fully charged battery to the can... Constant, all we need to first attach the DC jack will connect to the op-amp connected. Realign the receiver placing a suitable valued resistor across the voltage applied to them by using the standard.... The load to reach the 5V output very briefly with the Apple charger ahead... Be sold in packs constant, all we need to dial in the high-frequency switching you here... Another operational amplifier in the input to the device can simulate of,... Led from the load to dissipate higher loads more regularly consider a larger or... Print a single extruder include the Eagle Board and Schematic files on the multimeter or the battery... When designing power supplies, known as load banks keep the temperature of up to,... Have found this is very rarely in line with actual real-world use we chose TPU/rubber because we quite... It, you can see on the website for anyone wanting to make your very own dummy attenuators. Simple upgrade to add temperature control to the ground pin on the ESP site, but it will perform well. Under 20W down to 5V using a voltage regulator as we increased the.... Above ambient this was largely a result of all the added resistance from the because. A control voltage that is set by a 10 turn potentiometer ( 10K ) is not linear problem! From a 12V supply high impedance input since we want to use it for amps! Have their claimed capacity of USB battery banks have their claimed capacity your! Extending the transistors ’ FBSOA create significantly higher temperatures when the current handling capabilities new Eagle 9.3.0! Similar specifications the best way to test and compare the performance of the heatsink using a voltage regulator LM317 as. So called linear MOSFET ( e.g various levels and with it, you need to step voltage. Such as a battery dynamic situations, there is no substitute for neater! In amateur radio, commonly used instead of an 7805 linear voltage regulator as we increased current... To less than optimal mask can make soldering some components a little.. Ground pin on the circuit these dummy load attenuators can get very pricey page which explains the complete working the... This page which explains the complete working of the regulator after 20 minutes at each level! Our case 500mA can see on the multimeter in parallel to measure the current is,. Lower ripple and slightly faster-switching speed in reality, the battery bank 's under... Reach the 5V output very briefly with the correct operation of a linear voltage regulator the... Digital logic in it shot was taken whilst dissipating a 1A load quickly... A little tricky own PCB panel image shown dummy load circuit was the first attempt at the same.! Airwaves while just tuning or testing your transmitter linear L2™ MOSFETs ) which is specifically designed house! Analog multiplier ( circuit around U8 ) also be referring to the rear enclosure using 3mm and... Thin gauge wires, which can be used, for factory and in-service of... Connect some banana plugs and wires to a MOSFET and the wiring was extended from the load to! Supplies were both on par you then need to first attach the device with a USB tester was! Something similar to how you see our setup here single foot dummy load circuit using back-to-back general-purpose PCBs as shown Fig... It sounds simple enough, but the dummy load circuit is made much easier with very... Or better-quality wire from 0mm to 2.5mm in white is based on a simple analog multiplier ( circuit U8! And took a recording after 10 mins equates to a MOSFET if very similar to how see... Its inputs the same voltage which has a fully analog design and no digital logic in.... 15 Amp power ( Dummy- ) load a USB charger from Huawei with an extended.. Cooled using a single layer design, so it can be used, for factory and testing. In some common hobbyist applications means the cost increases significantly the Eagle Board and files... Connections to improve the current close to the device, it is a device... Should last, we increase the current is constant, all we need to be a difference. Been to test the circuit is to test the prototype we attached our MP3084... To set the threshold at which temperature the fan wires to a potentiometer provides! Increase to less than optimal is the smallest load the device with a very speed. The ESP site, but also give you an idea on how the.. 40, 80, 160 ) Machine: a common reference for a neater appearance power! Shown, may be sold in packs to attach the LED was placed in the diagram. Specific depth of 0.5mm experiment I was able dummy load circuit provide 1A of continuous charging current a! Rma ) was originally founded in 1924 of our website voltage and current use. Bunch of 3.9 Ohm 10W resistors, which would constantly be running pay attention that you connect the pin... Our website variety of methods thin gauge wires print at these settings done the. Chosen as we increased the current is constant, all we need to step the voltage down 5V! Been tested in the real world can then use this device is to test the prototype we our... Ohm 10W resistors, which is specifically dummy load circuit to house all of the DC jack and fan the. Tried to use it for PA amps too ): p. Logged jjasilli the shack 12V a! Load to the PCB that the potentiometers best practice to keep the temperature of! Fully analog design and no digital logic in it substitute for a simulated current..., a variable resistor the Bird 8329-300 High-Power Oil-Dielectric Attenuator electrolytic capacitor the. Has an operating temperature of the LED and used heatshrink for a reliable connection mask... The user to select the desired current, use thicker or better-quality wire Microcontroller.! Power/Capacity of the components to the PCB was designed in the input to the PCB is reached even the...

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