![]() ![]() ![]() Ideally, you also calculate for the max current your IRM-module is able to supply to ensure that an accidental short somewhere isn’t a going to be a problem. Remember to calculate the voltage drop and power dissipation in the series resistor/inductor for at least the load current that your circuit draws at max.Again, with a very high ripple frequency even a low value capacitor should make a big difference on the output. I can’t find anything about the maximum permitted capacitive load for the IRM-modules, but I’ve tended to stick to low-ish values such as 220-680uF (1000uF in one case) and that did not seem to cause problems.As series inductors I’ve used the AIAP-03 series from Mouser or something similar from Reichelt (search for 77A), but there should be many of options available. that could be used instead, but to be honest this time I could not be bothered to look for substitutes. There might also be similar AC/DC-converter boards from other manufacturers such as Recom, Traco etc. You can get the IRM-modules from many sources such as Mouser, reichelt, TME etc. They have all been tested and work as expected (although I have no measurements confirming the efficacy of the filter).ĭoes it use any special/expensive/hard-to-find parts? 56 x 99 mm.) for the dual version.Īll these are version 1.0. 32 x 90 mm.) for the single version and 2.2” x 3.9” (app. 27/54 x 92 mm.) for the mono/stereo versions respectively. I also have various other combinations (IRM and filter on separate PCBs etc.) which I expect I’ll be posting in a future post. The IRM modules are coupled with C-R-C or C-L-C “Pi”-filters, which should reduce the ripple on the output quite significantly due to the high switching frequency of the IRMs. There are single and dual versions for both the 5-10W and 15-20W IRMs, so four boards in total. Small single-/dual power supplies with IRM AC/DC power modules from Mean Well and passive filtering. These are excellent for adding compact and powerful single and dual supplies which still have a reasonably good performance to any small preamp/headamp amplifier. As promised a while ago, here are my designs for the “filtered” power supplies based on IRM AC/DC modules.
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