This is probably covered somewhere in the current threads, but searching didn't really turn much up.
I have efficient speakers (97dB/W) and so don't need a whole lot of power. I'm currently using a TI Equibit system (Panny XR25) modified to run off a 12V battery supply, which sounds pretty good, but since I need either 4 or 6 channels depending on my ultimate configuration, it's not enough by itself. I also have a couple of the Teac AL-700P units that I could mod into higher-performing units. However, the buzz around the UcD modules makes me curious to at least explore the options.
I know the datasheets for the UcD indicate that a minimum supply voltage of +-30 is needed, but it's not clear whether the unit will cease to function at lower voltage levels, or whether it will work but wont' meet spec. In a perfect world, a UcD 180 running off +-12V for ~10-15W into 4 ohms would be possible, but I'm not that optimistic.
If I 'know' I'll never draw more than maybe 20W peak out of any individual channel, what is the minimal UcD setup that I could consider? Would a single HG supply and 4 -180 modules work OK with this low power draw? What minimal xformer spec would be needed? Is DC even in the picture as a practical option?
I have efficient speakers (97dB/W) and so don't need a whole lot of power. I'm currently using a TI Equibit system (Panny XR25) modified to run off a 12V battery supply, which sounds pretty good, but since I need either 4 or 6 channels depending on my ultimate configuration, it's not enough by itself. I also have a couple of the Teac AL-700P units that I could mod into higher-performing units. However, the buzz around the UcD modules makes me curious to at least explore the options.
I know the datasheets for the UcD indicate that a minimum supply voltage of +-30 is needed, but it's not clear whether the unit will cease to function at lower voltage levels, or whether it will work but wont' meet spec. In a perfect world, a UcD 180 running off +-12V for ~10-15W into 4 ohms would be possible, but I'm not that optimistic.
If I 'know' I'll never draw more than maybe 20W peak out of any individual channel, what is the minimal UcD setup that I could consider? Would a single HG supply and 4 -180 modules work OK with this low power draw? What minimal xformer spec would be needed? Is DC even in the picture as a practical option?
Hi dwk123
I think it that is necessary for you 😉
http://www.classd.fromru.com/circuits/ucd3.html
Use on-line translator (google) for translate russian to english.
I think it that is necessary for you 😉
http://www.classd.fromru.com/circuits/ucd3.html
Use on-line translator (google) for translate russian to english.
Iv'e run my UcD 180's from +/- 20V with no problems -- If I get the chance I'll try them on a lower supply, and see what happens.
I would guess one of the main considerations would be just how much of a voltage drop is needed across the input op amp supply regulators, to allow them to continue to function correctly.
Reducing the supply voltage would also reduce the switch driver tail current, which in turn might increase the dead time, and perhaps increase the THD to an unacceptable level.
I guess you'd have to make your own mind up just how much of a spec. drop you'd accept - I would think that the minimum values Hypex recommend have been selected to retain a decent spec level.
I would guess one of the main considerations would be just how much of a voltage drop is needed across the input op amp supply regulators, to allow them to continue to function correctly.
Reducing the supply voltage would also reduce the switch driver tail current, which in turn might increase the dead time, and perhaps increase the THD to an unacceptable level.
I guess you'd have to make your own mind up just how much of a spec. drop you'd accept - I would think that the minimum values Hypex recommend have been selected to retain a decent spec level.
If you don't need the power, there is absolutely no penalty for running the UCD's at higher voltage. In fact there are advantages in distortion, as the switching frequency will vary less.
You can use fairly wimpy transformers too if you don't need much power.
Portland Mike
You can use fairly wimpy transformers too if you don't need much power.
Portland Mike
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