V1 is well underway - that's my personal headphone amp for my mancave.
I'm now looking for a small 20W stereo amp to drive some full range smaller Markaudio speakers. Footprint size, square and 12" corner to corner (realistically 10") to sit in the living room under the TV on an open shelf. Basically this is for the mrs to listen to Adelle in the front room on the CD/Bluray player. If possible the supply in the same box, but option for a small external supply box exists.
I was thinking of a small SRPP with a solid state backend - perhaps a small class D backend fed by a SRPP buffer (the recent thread got me thinking).
Has anyone done any projects like this?
Perhaps something like this: Hybrid Amplifier by Andrea Ciuffoli but scaled down from 100W.
I'm now looking for a small 20W stereo amp to drive some full range smaller Markaudio speakers. Footprint size, square and 12" corner to corner (realistically 10") to sit in the living room under the TV on an open shelf. Basically this is for the mrs to listen to Adelle in the front room on the CD/Bluray player. If possible the supply in the same box, but option for a small external supply box exists.
I was thinking of a small SRPP with a solid state backend - perhaps a small class D backend fed by a SRPP buffer (the recent thread got me thinking).
Has anyone done any projects like this?
Perhaps something like this: Hybrid Amplifier by Andrea Ciuffoli but scaled down from 100W.
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I built one of these about 10 years ago.
Quick and dirty but does what you want in class ab...
Since you don't need 80WPC, you can use lower B+ and smaller sinks.
HLJ DIY KIT Tube 6N3 + TDA7294 Power Amplifier Kit 80W+80W | eBay
Quick and dirty but does what you want in class ab...
Since you don't need 80WPC, you can use lower B+ and smaller sinks.
HLJ DIY KIT Tube 6N3 + TDA7294 Power Amplifier Kit 80W+80W | eBay
That's good - TDA7294IC which the data sheet looks like it can be configured for 20-30W no problem with a lower distortion figure. It could be run from a smaller 24V-0-24V power supply, possibly even a switcher 🙂eek🙂.
Yup.
Otherwise you could check out the TPA3116D2 if you want Class D.
TPA3116D2 data sheet, product information and support | TI.com
Otherwise you could check out the TPA3116D2 if you want Class D.
TPA3116D2 data sheet, product information and support | TI.com
What about going the other way around? Some easy to drive output tubes driven by operational amplifiers? I seem to remember there was a long thread about that.
Interesting circuit but I suspect with the OPTs it would be rather large. I could simply make a stereo tube amp with an OPT but I think the hybrid backend is a better approach. If I was building a DAC I could simply make it a power dac and use that design appended on the front.
For the dac I'm considering the topping E30 given it will take virtually anything and have a remote to control volume - easy for her (she's not patient with technology). Then the amp can simply have a volume that's left alone other than an on/off switch.
Yeah, from the OPT point of view my suggestion is no different from a valve-only amp.