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Hifisonix Standard PSU
Click here to buy a PCB for the Standard PSU
Click here for the build documentation
The Hifisonix Standard PSU features low noise, up to 400mA per rail output current, a MUTE relay driver to ensure when the load powers up or down there are no clicks or thumps, a +12V 40mA relay PSU and an auxiliary +5 or +3.3V supply (60mA max current draw) for powering any auxiliary logic or microcontroller circuits.
Output voltages are trimmed to exactly +-18 volts by means of two trimmer potentiometers. The power supply features very low full load (15 or 25W depending upon the power transformer chosen) noise with mains peaks at or below 100uV and thermal noise below -130 dBV.
Comments
5 responses to “Hifisonix Standard PSU”
Hello Geoff, the current PCB versions come with potentiometers to trim the output voltages to exactly +-18V – if you look at the X-Altra Mini II presentation, its detailed on slide 29 – link here https://hifisonix.com/wp-content/uploads/2023/06/X-Altra-Mini-II-Preamplifier-Main-Presentation-June-7-2023.pdf
Regards
Andrew
Hi Andrew,
Does the standard PSU now come with adjustment pots (as described in your X-Altra Mini II). Current description only shows Mk1 details for changing resistor values.Andrew,
I have listened with only my shop headphones, sound has nice weight but these headphones do not have very good mids and highs hence they have been relegated to the garage. When I get the power supply voltage set correctly and properly cased I will listen more seriously with my better headphones.Bill
That’s fantastic Bill. Have you had a chance to listen to your unit yet?
This was a nice, fun project to start learning to solder surface mount components. In the past I had been using a regular iron to solder smt. This time around I purchased a hot air solder station, by the end I was able to move pretty quickly and found I actually prefer the smt to through hole. I am 67 years old and my eyesight and steadiness of hand is not what it was but this was still very doable.
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