![]() With my 700W tranny this also means I have to use a softstart, which I made with power resistors (70Ohm) and some relays. Now I am building with 3 60mF capacitors, a 10mH choke (70A), 50MOhm resistors and a small 8uF capacitors to top it off. Pi filters can be designed as either low pass or high pass filters, depending on the components used. These numbers are not substantiated by hearing tests, just best guesses. This is the reason that the circuit is named as a pi filter. These three components are arranged in the form of greek letter pi. This circuit is designed with two filter capacitors namely C1 and C2 and a choke mentioned with āLā. To be honest, for the Aleph X I am building now (70W RMS on 4 Ohm) my criteria were: more than 100 mF per rail (after choke), and a ripple smaller than 10mV. The pi filter circuit design is shown below. I was very dissapointed with the result, so now I just over-design. Could you explain how the calculations and the pi-filters works (because some. My design is using 2 bulk-capacitor, each 15uF/400V, and 1mH coil on negative rail (following TNY-278s application note). the pi filter section is still confusing me. In my Aleph 5 design I calculated the minimun capacity, and went on from there. Hello all, Currently im designing a small SMPS 10W. I try to incorporate a CL before the CRCc in a way that I always have enough capacity after the L not to have to bother with the influence of L on my power supply for the amplifier. There people argue that the rise time from the PSU should be slower than the lowest frequency the amp is designed for. You should check the Bob Cordell interview on Power Supplies thread in Solid State amplifiers. ![]() When I installed chokes in my Aleph 5, and my DAC everything was kind of less stressing to listen to. One of the reasons I like chokes, is that it filters a lot of the HF I have on my powerline. There are several goals one has to achieve when designing power supplies. ![]()
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