This depends on how efficient the headphones are. The HPA-1 will drive 16 Ohms - it current limits at about 250-300 mA output. If you phones are efficient then they will be load enough well before this point, otherwise not.
I would try it, and if you’re not happy, then build a second amp.
I would try it, and if you’re not happy, then build a second amp.
Andrew, thanks a lot,it is much appreciated ! I have received the board today. Just to good to be true with this Post Office in this broken place.😀
Now to order those minute nipper components !🙂
Now to order those minute nipper components !🙂
An interesting design Bonsai. I'll play with it in LTSpice, and then I might build this into my own DAC rather than the simple diamond buffer I was planning to add 🙂
Yes, anything you want.
I have a power supply board coming for the headphone amp (it’s also for the coming line level pre). It’s about 2 weeks away if you want to wait for that as well.
I have a power supply board coming for the headphone amp (it’s also for the coming line level pre). It’s about 2 weeks away if you want to wait for that as well.
Hello, the new Hifisonix Standard Linear PSU is up on my website here
Hifisonix Standard PSU
This is the ideal way to power the HPA-1 (and coming line level preamp)
Hifisonix Standard PSU
This is the ideal way to power the HPA-1 (and coming line level preamp)
Wonderful! Of course, my finger has been on the trigger for the last couple of weeks. Looking forward to taking the next step.
The psu board has arrived. Thanks very much, Andrew. Is the BOM available yet? No rush, I'll probably end up finishing this up in the Fall as I'm going to order the line-level preamp pcb when it's ready.
Sorry Sonidos,
Rushing around the last few days - house Reno’s finished now though. I will put it up today or tomorrow. It’s basically done but I have to check it first.
🙂
Rushing around the last few days - house Reno’s finished now though. I will put it up today or tomorrow. It’s basically done but I have to check it first.
🙂
Andrew,
I received both boards thank you, I was not planing to build the headphone amp for a while but I was short a few parts for a project I was working on and went ahead and ordered parts for it. I have to admit i was surprised how affordable the parts were - about $30 - I had heat sinks already. I guess one reward for switching to smt parts is they are much more affordable parts.
Thanks
Bill
I received both boards thank you, I was not planing to build the headphone amp for a while but I was short a few parts for a project I was working on and went ahead and ordered parts for it. I have to admit i was surprised how affordable the parts were - about $30 - I had heat sinks already. I guess one reward for switching to smt parts is they are much more affordable parts.
Thanks
Bill
Quick question regarding solder paste, our summer temps have been over 100 Degrees Fahrenheit in my workspace should I be storing the paste solder in the refrigerator? I have herd of people having issues with what I think is probably separation of the components.
Bill
Bill
Hi Wirewiggler,
Yes SMD parts are cheaper - mainly because that’s where the volume is nowadays. For example, I worked for a large semiconductor company for 20 yrs - we got out of TO92 already in 2007.
Re paste storage, unfortunately I am not able to advise on that - I use 0.5 mm solder for all my SMD assembly work.
Maybe one of the other diyAudio members would care to advise?
Yes SMD parts are cheaper - mainly because that’s where the volume is nowadays. For example, I worked for a large semiconductor company for 20 yrs - we got out of TO92 already in 2007.
Re paste storage, unfortunately I am not able to advise on that - I use 0.5 mm solder for all my SMD assembly work.
Maybe one of the other diyAudio members would care to advise?
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