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PostPosted: 20 Aug 2010, 13:24 
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Joined: 31 Dec 2008, 15:34
Posts: 441
Rohan wrote:
hey guys,
i just got a really good circuit simulator at http://www.falstad.com/circuit/

A fun simulator Rohan ( thanx for sharing, i've never seen it before ).

The bottom slider in the right side is genious, it's the adjustment of the trimpot for biasing. I've also tried to input some data 8-)

$ 1 5.0E-6 8.281975887399955 5 5.0 50
v 128 224 128 352 0 1 100.0 1.0 0.2 0.0 0.5
R 688 96 688 32 0 0 40.0 13.0 0.0 0.0 0.5
w 688 144 688 208 0
w 688 336 688 352 0
g 688 432 688 464 0
g 128 352 128 464 0
w 688 320 688 336 0
r 864 320 864 448 0 32.0
g 864 448 864 464 0
r 608 224 480 224 0 150.0
c 352 224 480 224 0 1.0E-6 -12.025247214276499
174 448 96 512 112 0 100000.0 0.9554000000000001 100k
w 512 96 592 96 0
w 608 96 688 96 0
w 688 96 688 144 0
w 480 112 480 224 0
r 192 224 192 432 0 100000.0
g 192 432 192 464 0
r 192 224 336 224 0 4700.0
w 336 224 352 224 0
w 688 240 688 272 0
w 688 272 688 320 2
w 864 272 864 320 0
c 784 272 864 272 0 6.799999999999999E-4 5.426908720544447
w 784 272 688 272 0
c 688 96 752 96 0 1.0000000000000001E-7 13.0
g 480 432 480 464 0
r 480 224 480 432 0 100000.0
i 688 352 688 432 0 0.25
w 608 224 624 224 2
w 592 96 608 96 0
f 624 224 688 224 0 1.5
w 128 224 192 224 0
g 752 112 752 128 0
g 432 112 432 128 0
w 432 112 432 96 0
w 752 112 752 96 0
w 448 96 432 96 0
o 0 64 0 35 5.0 7.8125E-4 0 -1
o 23 64 0 35 10.0 0.05 1 -1


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PostPosted: 21 Aug 2010, 14:59 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Rohan wrote:
and i simulated this amp but the gain was really below 1 so a few questions

RMS of the amp is about 700 mV with a 32 ohm load. Can this be loud enough to drive headphones ??

3.What does the capacitor (0.1u) with the power do?

Hi Rohan.
The gain is about 0.8. i.e. 20% loss in the input signal.

700 mV is way more than enough to drive headphones.

The 0.1uF cap is for decoupling.
Cheers

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PostPosted: 31 Aug 2010, 06:47 
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Joined: 08 Aug 2010, 06:18
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Hi, i made this amp too. Currently i'm running on 14v form about 25v because i have very small heatsinks on LM317s and IRF610s.

The PCB is diy (made by myself) and the case is temporary because is use to make different layouts.

Image


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PostPosted: 31 Aug 2010, 22:10 
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Hi xfxlv, welcome to the forum.

Those sinks should be adequate. If not try ventilation holes above and blow the sink locations.

If you have a 25V supply that is regulated down. Try a voltage closer to 20. IMO the amp sounds better at higher voltages.

How do you like the amp?
Cheers

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PostPosted: 01 Sep 2010, 07:23 
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Joined: 08 Aug 2010, 06:18
Posts: 2
Hello, I like the amp very much, because it dont have those harsh Highs and the base is good too, no disortion.

What is the maximum supply voltage for this amp? Can i go with all 22-25 volts?

Yesterday i got temps between 60 and 65 celsius un my termo probe.

And one question - im currently running 1000uf/50v on output. Is this bad or is it ok instead of 680uf?


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PostPosted: 02 Sep 2010, 12:23 
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You can push the voltage higher, but I only tested up to about 24V. The limitation is going to be the voltage limit of the LM317.

1000uF / 50V cap will be fine. You want to use 680uF and up. The capacitor will affect the sound quality so you may want to try other brands and low ESR types.

Enjoy the amp.
Cheers

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PostPosted: 11 Oct 2010, 23:43 
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Joined: 09 Oct 2010, 21:46
Posts: 1
Hello, I'm new in diy,
I tried to follow everythings, but mine keeps sounde so weak, I hardly listen it.
any idea what going on? I used 9vx2 battery for testing only, and a 100uf 100v capacitor ( use some other too ) is that would be the problem?
Thanks
D.


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PostPosted: 12 Oct 2010, 12:15 
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Hi Questa, welcome to the forum.

A stereo build of the class-A mosfet follower headphone amplifier will draw about 250 to 300 mA. That is too large of a draw for a 9v battery. You can check what is going on with a meter. Under load check what voltage and current the batteries are supplying to the circuit.

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 03 Nov 2010, 11:00 
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Joined: 03 Nov 2010, 10:46
Posts: 1
Dear all, :P

I am new to DIY and this forum. I searched about headphone amp on Google and found this one. I understand all symbols expect the "signal ground" and "power ground". How to do that? :confused:

My concept on "Earthing" is only connecting metal cases with the earth line in sockets. :sick:


Hope you will help me :D :D :xfingers: :xfingers: :xfingers:


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PostPosted: 04 Nov 2010, 20:54 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Welcome to the forum.

I would suggest using a "star grounding" system.
More info here: http://www.aikenamps.com/StarGround.html

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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