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Board index » DIY Forums » Solid State / Op-Amps / Chip Amps / Class-D

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wdecho
PostPosted: 27 Aug 2017, 18:13 
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Joined: 18 Aug 2015, 07:38
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I've spent some more hours with this amplifier. I want to emphasis that the difference in the soundstage only shows itself at lower volumes. Others say I like to listen to loud music so the difference will not show itself as much as someone that listens at lower volumes. I just now compared the D to my 300B SET and it made a respectable showing. I am not a reviewer so I cannot go into details of differences between it and any amplifier. I am glad I built it. It is hard to justify building amplifiers from scratch when one can buy a board ready built for such little money but building is my hobby in my retirement years to keep me busy. I would be perfectly happy with this amplifier if it were my only one. At least for the brief time I have had it. My opinion on anything is subject to change without notice but for now I am happy and want to listen to it some more. A good sign.
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wdecho
PostPosted: 27 Aug 2017, 18:19 
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I also want to mention I see no problem throwing some pots on this amplifier build. I am using a Firstwatt B1 V2 buffer without any gain and it has plenty of gain using only a 1V output of my computer and DAC. If I am not mistaken full output is achieved with 1.5V so most speakers will have all the power it needs with any 2V CD or DVD player or computer for that matter. I do not think one would degrade the sound if they were to build an op-amp buffer or an op-amp pre with a slight amount of gain for the front end if they think it necessary. I really like my FW B1 V2 using J-fets for all my amplifiers that can operate without any gain.
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mwhouston
PostPosted: 27 Aug 2017, 18:52 
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I've used stepper pots on most of my Ds. 100K seems to work best.

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Projects:Raw 180W Tripath Class D power amp - najah | "Icon" - Shuguang CV-181Z preamp | "Succinct" - Four input 180W Class D Tripath amp with atenuator
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mwhouston
PostPosted: 05 Jan 2019, 19:12 
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Yet another hifimediy T4 Tripath 180W amp. This time four inputs with selection switches and power switch all upfront. Once more a DC supply but with 24 step stepper attenuator and of course a gold knob. This was a commission job.

Big bassy sound and quite warm. External images to follow.
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ILoveHiFi
PostPosted: 06 Jan 2019, 04:51 
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Joined: 23 Feb 2017, 02:02
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Not every one is a audipophile and understands that a power amp without any volume control means luxruious and high quality good sound.
mwhouston wrote:
JerryB wrote:
Beautiful build!
It looks like this amp (the T4) does not have a volume pot - it that correct? Can it therefore only be used with a preamp?
You suggested a Nelson Pass BoZ single JFET preamp (under another topic) for my T1 amp. Would the BoZ be a good option for any of the HiFiMeDIY T-amps then? If so, can one then build the BoZ and the T1 (without a volume pot) into one enclosure to accept line input sources like a DAC, iPod or Cell Phone?
Sorry for all the questions.
- Jerry


Yes this is a power amp only. Funny though two of these I sold to one guy he brought them back and had me add attenuators. I used 24 step step attenuators. One I did make initially with attenuator also sold to someone who didn't want to use a preamp.

I use a two stage tube preamp with three selectable inputs. Because it is two stage it can work into higher loads and I use it to drive my latest T4. I would recommend you build an integrated amp with preamp, volume control and a few selectable inputs in the one encloser. Good way to go. If you keep preamp and power amp seperate you can mix and match. I have a few SS and tube preamps so I can try diffent combinations. But I have also thought about an intergrated.
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mwhouston
PostPosted: 06 Jan 2019, 05:29 
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ILoveHiFi wrote:
Not every one is a audipophile and understands that a power amp without any volume control means luxruious and high quality good sound.
mwhouston wrote:
JerryB wrote:
Beautiful build!
It looks like this amp (the T4) does not have a volume pot - it that correct? Can it therefore only be used with a preamp?
You suggested a Nelson Pass BoZ single JFET preamp (under another topic) for my T1 amp. Would the BoZ be a good option for any of the HiFiMeDIY T-amps then? If so, can one then build the BoZ and the T1 (without a volume pot) into one enclosure to accept line input sources like a DAC, iPod or Cell Phone?
Sorry for all the questions.
- Jerry


Yes this is a power amp only. Funny though two of these I sold to one guy he brought them back and had me add attenuators. I used 24 step step attenuators. One I did make initially with attenuator also sold to someone who didn't want to use a preamp.

I use a two stage tube preamp with three selectable inputs. Because it is two stage it can work into higher loads and I use it to drive my latest T4. I would recommend you build an integrated amp with preamp, volume control and a few selectable inputs in the one encloser. Good way to go. If you keep preamp and power amp seperate you can mix and match. I have a few SS and tube preamps so I can try diffent combinations. But I have also thought about an intergrated.

Am I missing something?

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Projects:Raw 180W Tripath Class D power amp - najah | "Icon" - Shuguang CV-181Z preamp | "Succinct" - Four input 180W Class D Tripath amp with atenuator
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Yungman
PostPosted: 06 Jan 2019, 19:07 
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Joined: 26 Dec 2016, 03:46
Posts: 194
Location: Bayarea
He was just making an integrated amp out of it. I did the same thing to my power amps also, it's more convenient. I use remote motorized volume though, too lazy to get up to adjust the volume.
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mwhouston
PostPosted: 07 Jan 2019, 00:29 
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Yungman wrote:
He was just making an integrated amp out of it. I did the same thing to my power amps also, it's more convenient. I use remote motorized volume though, too lazy to get up to adjust the volume.

An attenuator in a power doesn't make an integrated amp. A preamp and power amp in the one enclosure is an integrated amp. The other is a power amp with an attenuator.

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Yungman
PostPosted: 07 Jan 2019, 04:05 
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Joined: 26 Dec 2016, 03:46
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Attenuator in front of the power amp is like volume control. Making it to a 3 input to accept different input is just like an integrated amp.
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mwhouston
PostPosted: 07 Jan 2019, 05:57 
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Yungman wrote:
Attenuator in front of the power amp is like volume control. Making it to a 3 input to accept different input is just like an integrated amp.

But not an integrated amp.

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