I just wanted to say thanks to all those who took the trouble to reply to my question about simulators. Some of the posts were especially detailed and informative and I feel I have a better understanding now and appreciate the time people put into composing them. As with most things it seems you get what you pay for. With any physical system your simulations are only as good as the underlying assumptions in the model and the quality of your input data. I'm sorry that my question provoked some strife within the forum, this was not intended.
Best wishes
Phil
Best wishes
Phil
Phil, if you ever need it I'll be happy to answer privately any questions you may have about LTSpice, and I can help you make your simulations more reliable. I usually respond within a day.
- keantoken
- keantoken
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Hello
Here is the links to all the Haksa circuits.
Some changes could happen on some of those schematics.
Bye
Gaetan
The amp; diyAudio
The same amp with a CCS; diyAudio
The first tone controls showing volume and balance controls; diyAudio
The same tone controls with minor corrections, without the volume and balance controls; diyAudio
The crossfeed, maby not final schematic;diyAudio
The power supply (not final schematic, may change); diyAudio
Here is the links to all the Haksa circuits.
Some changes could happen on some of those schematics.
Bye
Gaetan
The amp; diyAudio
The same amp with a CCS; diyAudio
The first tone controls showing volume and balance controls; diyAudio
The same tone controls with minor corrections, without the volume and balance controls; diyAudio
The crossfeed, maby not final schematic;diyAudio
The power supply (not final schematic, may change); diyAudio
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thanks a lot! this is a great summary!
if allowed I'd suggest to put this also inside the first post of this thread.. at least a link to it so it will be easy to reach.
Kr,
tent:wq
Hi,
would replacing either or both of the bc557b/547b with a bc560b/550b or bc560c/550c improve performance?
The 547/557 is the higher voltage version, the 550/560 is the lower noise version and the c is the higher gain version.
would replacing either or both of the bc557b/547b with a bc560b/550b or bc560c/550c improve performance?
The 547/557 is the higher voltage version, the 550/560 is the lower noise version and the c is the higher gain version.
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Possibly, Andrew. Why not build up a breadboard, and tell us your thoughts?
Hugh, grinning wildly.......
Hugh, grinning wildly.......
Hi Hugh
Nice circuit, heres some info of how JLH would have done it, if just for interest, you may want to try some of his ideas, they rock, I have a circuit for headphones based on this liniac circuit for my seinheisers which I use, on off, makes great linestages too.
Nice circuit, heres some info of how JLH would have done it, if just for interest, you may want to try some of his ideas, they rock, I have a circuit for headphones based on this liniac circuit for my seinheisers which I use, on off, makes great linestages too.
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Again, sorry, heres a link, the file is to big to attach, its only 450kb.
http://anacon-tech.com/IPdocs/JLH_LINIAC.pdf
Many thanks, HM,
I have followed JLH for more years than I am prepared to admit. I remember first hearing his 1969 10W Class A in 1971, a good friend, now an accomplished engineer, built it into a small shoebox, and I vividly recall Paul Desmond playing 'Summertime' through it. It was largely responsible for drawing me into high end, to be frank, and I enjoy his writing style.
I will read this article immediately, thank you!
Hugh
I have followed JLH for more years than I am prepared to admit. I remember first hearing his 1969 10W Class A in 1971, a good friend, now an accomplished engineer, built it into a small shoebox, and I vividly recall Paul Desmond playing 'Summertime' through it. It was largely responsible for drawing me into high end, to be frank, and I enjoy his writing style.
I will read this article immediately, thank you!
Hugh
Member
Joined 2009
Paid Member
Thanks - I haven't seen this one before. I do like reading his articles. I'm working on a JLH variant as part of my current DIY design activities and always marvel at how we reinvent what has gone before and already been done so well.
Okay, I've trying to figure out how much power a 1mW/100db transducer would need.
Even 1mW produces hearing damage, but what we want is somewhere around 60db, about as loud as normal speech. That would be less than 1mW.
1V into 60 ohms gives 16mW, more than we will ever need, unless I'm wrong. Do we really need to be able to push 150mA on demand?
And is the relationship between mW and db linear? As in, to get 60db do we simply put in .6mW?
- keantoken
Even 1mW produces hearing damage, but what we want is somewhere around 60db, about as loud as normal speech. That would be less than 1mW.
1V into 60 ohms gives 16mW, more than we will ever need, unless I'm wrong. Do we really need to be able to push 150mA on demand?
And is the relationship between mW and db linear? As in, to get 60db do we simply put in .6mW?
- keantoken
Kean,
The 122mA chosen is largely the result of wanting to throw power into high and low z cans, from 24R all the way up to 2K.
If you do the sums on 2K phones, you have 1Vrms (2.828Vpp, or 1.414Vp) producing just 0.5mW of power, which would be 97dBA if they are 100dB/watt.
OTOH, for 24R headphones, 1Vrms would give us 20.8mW of power with a 10R series resistor as per convention. This would be 109dBA (unless my math is wrong).
As you can see, we have wild, carefree overkill here...... a nicely over-engineered component which should keep deaf trolls into heavy metal for centuries....
And you call yourself American, let alone a TEXAN, where EVERYTHING IS BIG???
Hunker down, buddy, y'all......
Hugh
The 122mA chosen is largely the result of wanting to throw power into high and low z cans, from 24R all the way up to 2K.
If you do the sums on 2K phones, you have 1Vrms (2.828Vpp, or 1.414Vp) producing just 0.5mW of power, which would be 97dBA if they are 100dB/watt.
OTOH, for 24R headphones, 1Vrms would give us 20.8mW of power with a 10R series resistor as per convention. This would be 109dBA (unless my math is wrong).
As you can see, we have wild, carefree overkill here...... a nicely over-engineered component which should keep deaf trolls into heavy metal for centuries....
And you call yourself American, let alone a TEXAN, where EVERYTHING IS BIG???
Hunker down, buddy, y'all......
Hugh
I was about to suggest using the JLH output stage when I realized that then we'd have a carbon copy of the JLH itself... 
- keantoken
- keantoken
Member
Joined 2009
Paid Member
I was about to suggest using the JLH output stage when I realized that then we'd have a carbon copy of the JLH itself...
- keantoken
The JLH is a very elegant design isn't it. I'm in the process of building one. But it wouldn't be a HAKSA....
Hi Guys,
it's been pretty quiet in this post for the last couple of weeks.
Has anybody gotten around to breadboarding a version yet......or are we all spooked by that runaway train called Christmas that is rushing towards us (I am!)
How's the JHL going Bigun?
Cheers, Kim
it's been pretty quiet in this post for the last couple of weeks.
Has anybody gotten around to breadboarding a version yet......or are we all spooked by that runaway train called Christmas that is rushing towards us (I am!)
How's the JHL going Bigun?
Cheers, Kim
Member
Joined 2009
Paid Member
Don't worry HAKSA is alive and well, but now that the design is 'done' there will be a quiet time whilst the board gets sorted out and I know Hugh is very busy.
The JLH hasn't started yet, I won't have time til after Christmas. But I've now simulated it to get a better feel for how it works.
The JLH hasn't started yet, I won't have time til after Christmas. But I've now simulated it to get a better feel for how it works.
