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0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit 21% OFF 0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit ₹650.03 ₹821.32 View It
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Ion54 24/07/2015
First I would suggest you shall not complain for missing heat sink, fan and transformer. Only the transformer will be almost double the price of the electronics and the weight of the package will make it more expensive to ship. Parts were all in the antistatic bag and documentation can be downloaded. Depending on your skills can take from 1 to few hours until you open the bag until you are ready to test. Once everything has been assembled the PS shall work and do what it says will do. There are few things that you shall pay attention: 1. AC transformer that delivers more than 24V ac when not under load. If that is the case most likely you'll blow two TL081 op amps that are powered between the output of the main rectifier and the supplementary -5V source (U2 and U3). 2. AC voltage shall not drop under 24V fi you want to get 30V at the output and even then only for lower output currents. 3. Potentiometers supplied are very hard to precisely adjust. 4. R3, 220 Ohms, gets quite hot. My recommendations are: A. Forget about 30V output at 3A, settle for 24V or less B. Get a decent AC transformer that can deliver 22V with no load and 21V at 3A for 24V out. C. Get a nice CPU heat sink without fan and install D1047 on it with a little thermal grease. Install the transistor remote, such as the heat sink is in the open and the fins are vertical to allow proper air flow. D. Forget about 3A continuous and aim for 2A. You can still have 3A for short periods of time, but that will overheat the rectifying diodes and the ripple out of the filter capacitor will be too high. E. Spend more money if you want a real 30V/3A continuous duty PS, but for the $10 you paid be happy with what you've got, a very decent, regulated PS that can be used in your own home lab and which you put together yourself.
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  • Ion54 Noticed I made a mistake and could not find any other way of correcting than commenting my own review. The resistor getting hot is the 82 Ohms R2! The heat dissipation drops if you go for a lower input voltage, but I will say it is better to replace R2 with a 1W resistor or two 160 Ohms/0.5W in parallel.

    Reply 27/07/2015
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