I would recommend to avoid the simmetrical clipping technique. lets just the wave get a ansymetrical clipping. That will make sure that the harmonic content with the distortion have more even harmonics.
Thanks very much! I hoped to have this done back in the 15th, but I'm just drowned in work and couldn't finish it until now. Stay tuned for the next video where I'll be measuring its performance.
man, I spent almost 20h watching this projects GREAT videos downloaded your project (I understand "Rev A" is the final one and the diagram as well?) but I have a question: my headphones are 37 Ohms, with only 94dB sensitivity (Hifiman Sundara, plannar) I am not sure this amp will be enough for them The amp I use with them is almost 4W on 32 Ohms while yours is much less (considering your power supply is only measured 3VA per channel) What is to be changed to have more power from your amp? I think the current you designed will be not enough - right? you started with 300 Ohms ones - for sure they need lots of Volts but much less current any hint? thx
Reading comments like this really makes my day. Rev A was the final revision, but it's geared towards higher impedance headphones. It'll drive a 37 ohm headphone fine, but you'll get a slightly higher distortion (still lower than 0.1% though). If you want to make this design more suited to lower impedance headphones all that you'll have to do is reduce R20 to get a bit more idle current, and while you are at it you should also reduce the input voltage of the amp to reduce the power dissipation that'll come from the higher current. Don't forget to also change R2-R7 in the power supply section to match your new current requirements. All that will definitely improve the performance of the amplifier with low impedance headphones and make it perfect for your Sundara. If you want some more details about the design, including some nice measurements that I've performed on it you can check out its page here: innoveworkshop.com/project/bipolary
@@innoveworkshop thank you brother, I am still thinking about the values: Consider 2W needed on 37 Ohms. Considering: P=I^2*R -> I^2=P/R = 2W/37Ohms= 0.054 -> I= 0.232A. Now from: P=U*I -> U=P/I -> 2W/0.232A=8.6V So we need 8.6V with current max (for 2W) needed 0.232A. This is more than 3 times your calculations (you calculated max current on 70mA if I remember correctly). So considering this what is to be changed? 1st is power supply - that is obvious. Then? We need enough voltage on the output (max 8.6V)... So now I am not sure if improving power supply AND just adjusting resistors is enough. Any hint? For the amp section I am concerned.
14:00 c'mon man, you did just as old-school maglites did, put a hidden backup bulb right next to the main one... or inside of the backswitch... use as backup fuse.
![โรงเรียนห้ามรัก โดนจับได้ตาย...!! [เอิร์นไดเม่]](http://i.ytimg.com/vi/4u02Sbr556Q/mqdefault.jpg)
Can you tell from your experience what current do need Apple iPod headphones, to be loud enough?
I would recommend to avoid the simmetrical clipping technique. lets just the wave get a ansymetrical clipping. That will make sure that the harmonic content with the distortion have more even harmonics.
Great !
Nice work !
Thanks very much! I hoped to have this done back in the 15th, but I'm just drowned in work and couldn't finish it until now. Stay tuned for the next video where I'll be measuring its performance.
@@innoveworkshop i sent you an email ! Liked and subscribed also !!
Thanks! Just replied to your email.
@@innoveworkshop Did the same :)
man, I spent almost 20h watching this projects GREAT videos
downloaded your project (I understand "Rev A" is the final one and the diagram as well?)
but I have a question: my headphones are 37 Ohms, with only 94dB sensitivity (Hifiman Sundara, plannar)
I am not sure this amp will be enough for them
The amp I use with them is almost 4W on 32 Ohms while yours is much less (considering your power supply is only measured 3VA per channel)
What is to be changed to have more power from your amp?
I think the current you designed will be not enough - right?
you started with 300 Ohms ones - for sure they need lots of Volts but much less current
any hint?
thx
Reading comments like this really makes my day.
Rev A was the final revision, but it's geared towards higher impedance headphones. It'll drive a 37 ohm headphone fine, but you'll get a slightly higher distortion (still lower than 0.1% though).
If you want to make this design more suited to lower impedance headphones all that you'll have to do is reduce R20 to get a bit more idle current, and while you are at it you should also reduce the input voltage of the amp to reduce the power dissipation that'll come from the higher current. Don't forget to also change R2-R7 in the power supply section to match your new current requirements.
All that will definitely improve the performance of the amplifier with low impedance headphones and make it perfect for your Sundara.
If you want some more details about the design, including some nice measurements that I've performed on it you can check out its page here: innoveworkshop.com/project/bipolary
@@innoveworkshop thank you brother, I am still thinking about the values: Consider 2W needed on 37 Ohms. Considering: P=I^2*R -> I^2=P/R = 2W/37Ohms= 0.054 -> I= 0.232A. Now from: P=U*I -> U=P/I -> 2W/0.232A=8.6V
So we need 8.6V with current max (for 2W) needed 0.232A. This is more than 3 times your calculations (you calculated max current on 70mA if I remember correctly).
So considering this what is to be changed? 1st is power supply - that is obvious. Then? We need enough voltage on the output (max 8.6V)... So now I am not sure if improving power supply AND just adjusting resistors is enough. Any hint? For the amp section I am concerned.
vc é Tuga?
14:00 c'mon man, you did just as old-school maglites did, put a hidden backup bulb right next to the main one... or inside of the backswitch...
use as backup fuse.