Hello DIYAudio,
I have a set of Sony speakers (I think they're 150Wx6 Ohm each) from an old micro hi-fi. I wanted to build a Class D receiver/amplifier for them to use in my workshop. But I can't work out how to safely (and frankly cheaply for these cheap speakers) go about doing this.
The actual amplifier and filters etc. wasn't my problem. (I have in-depth "hacker level" experience with building circuits and working with chips etc.). But I a) didn't know if there were better or worse quality Class D Chips and b) couldn't work out what was the safest, most cost effective and best quality to choose between all the transformer stages with the power supply. For example, does an AC or DC power supply result in better sound quality with a TPA Class D chip.
My question is, what is the best way to use these speakers for less than $100? I can't justify spending more on them, but if that's too low please feel free to just tell me that I'm being overly optimistic.
I have no idea what I want the solution to be, I am just asking for a one line response or link from the DIYAudio pro's. It doesn't need to be Class D. It doesn't need to be a standalone receiver/amplifier but I didn't know if a "little" box on the back would be powerful enough. Giving them Bluetooth capabilities would be a great bonus, but yet again I just want to know if I can still use these speakers or should just bin them.
Thank for your advice!View attachment Sony SS-H701.pdf
I have a set of Sony speakers (I think they're 150Wx6 Ohm each) from an old micro hi-fi. I wanted to build a Class D receiver/amplifier for them to use in my workshop. But I can't work out how to safely (and frankly cheaply for these cheap speakers) go about doing this.
The actual amplifier and filters etc. wasn't my problem. (I have in-depth "hacker level" experience with building circuits and working with chips etc.). But I a) didn't know if there were better or worse quality Class D Chips and b) couldn't work out what was the safest, most cost effective and best quality to choose between all the transformer stages with the power supply. For example, does an AC or DC power supply result in better sound quality with a TPA Class D chip.
My question is, what is the best way to use these speakers for less than $100? I can't justify spending more on them, but if that's too low please feel free to just tell me that I'm being overly optimistic.
I have no idea what I want the solution to be, I am just asking for a one line response or link from the DIYAudio pro's. It doesn't need to be Class D. It doesn't need to be a standalone receiver/amplifier but I didn't know if a "little" box on the back would be powerful enough. Giving them Bluetooth capabilities would be a great bonus, but yet again I just want to know if I can still use these speakers or should just bin them.
Thank for your advice!View attachment Sony SS-H701.pdf
Hi MAAC0,
I think that's exactly what I was looking for!
Rather than trying to size all the different TDA Class D options, searching for the LM3886 yielded a detailed tutorial. I will start wading through it ASAP and hopefully have a build in the next year (lockdown and quarantines depending). Thank you!
Playing around with the design spreadsheet showed I could use them in "parallel mode" with 31V and get 65W (I assume per channel). Since that's about 50% of the useless peak power according to the specs (they're actually SS-H801V speakers) I'm sure I won't be left wanting at all.
Thanks again and keep safe!
P.S. if any Class D fan can point me in a similar direction for education and comparison purposes, I would be very grateful. Since I live in South Africa, I'll have to make the decision on parts availability in the end.