I found this schem in internet
http://home.zonnet.nl/tschrama/owndesign.html
can anybody suggest ?
how can I build power supply?
or more
I'm a newbie
some parameter
generator: 1K Ohm amperes: 2.618 Amp
device: IRF530S power@1%2/3rd: 7.558 Watt
z-Bias: 100K Ohm dissipation: 86.39 Watt
Bias Voltage: 25.2 Volt rendement: 8.749 %
z-source: 8 Ohm gain: 0.908 x
output capacitor: 4700uF Z-out: 0.2588 Ohm
supply: 33 Volt -dB @ 10 Hz: -0.6614 dB
z-speaker: 8 Ohm -dB @ 100 kHz: -0.0323 dB
rimple rejection: 0.648 %
THD@0.33Watt THD@1Watt THD@3Watt
0.125 % 2nd 0.223 % 2nd 0.432 % 2nd
0.006 % 3rd 0.022 % 3rd 0.079 % 3rd
http://home.zonnet.nl/tschrama/owndesign.html
can anybody suggest ?
how can I build power supply?
or more
I'm a newbie
some parameter
generator: 1K Ohm amperes: 2.618 Amp
device: IRF530S power@1%2/3rd: 7.558 Watt
z-Bias: 100K Ohm dissipation: 86.39 Watt
Bias Voltage: 25.2 Volt rendement: 8.749 %
z-source: 8 Ohm gain: 0.908 x
output capacitor: 4700uF Z-out: 0.2588 Ohm
supply: 33 Volt -dB @ 10 Hz: -0.6614 dB
z-speaker: 8 Ohm -dB @ 100 kHz: -0.0323 dB
rimple rejection: 0.648 %
THD@0.33Watt THD@1Watt THD@3Watt
0.125 % 2nd 0.223 % 2nd 0.432 % 2nd
0.006 % 3rd 0.022 % 3rd 0.079 % 3rd
Attachments
Don't you want to try this one, you'll get better linearity and other parameters.
http://www.pha.inecnet.cz/macura/follower_e.html
http://www.pha.inecnet.cz/macura/follower_e.html
Attachments
Go find (or wind) yourself a pair of big chokes.
You´ll double the efficiency compared to a CCS design.
Something like 100mH is enough for 8 ohms load.
There are some threads in this forum about choke loaded solid state amps, have a look.
You´ll double the efficiency compared to a CCS design.
Something like 100mH is enough for 8 ohms load.
There are some threads in this forum about choke loaded solid state amps, have a look.
Hi aiwonsi,
yes, you can use lower voltage for lower power. In that case you have to maintain at Gate of T1 voltage Vs/2 + 4V. That means that for supply voltage of 24V you need 16V at gate of T1. This can be done by changing of R3 value. The circuit as shown (mosfet power follower) is not much sensitive to supply voltage ripple. The supply ripple rejection is about 60 dB, standard bridge and cap supply can be used. You will find one on my web page, same address as shown above. Fig.5. In case of more questions you can send me an e-mail.
Pavel
yes, you can use lower voltage for lower power. In that case you have to maintain at Gate of T1 voltage Vs/2 + 4V. That means that for supply voltage of 24V you need 16V at gate of T1. This can be done by changing of R3 value. The circuit as shown (mosfet power follower) is not much sensitive to supply voltage ripple. The supply ripple rejection is about 60 dB, standard bridge and cap supply can be used. You will find one on my web page, same address as shown above. Fig.5. In case of more questions you can send me an e-mail.
Pavel
thank everybody,
I'm a newbie.
I'm very fool about electronic.
I have some question.
I wan't about 5watt load 8 ohms. How do I change this circuit(power follower)? And why?
aiwonsi
I'm a newbie.
I'm very fool about electronic.
I have some question.
I wan't about 5watt load 8 ohms. How do I change this circuit(power follower)? And why?
aiwonsi
For 5W/8 Ohm you need output voltage of 6.5Vrms.
P = 6.5 x 6.5/8 = 5.28 W
For 6.5Vrms you need supply voltage at least 20V.
Vs = 2 x 1.414 x 6.5 = 18.38 + saturation voltage of transistors.
For single ended class A you will need Iq (quiescent current) at least 1.2 A for 5W/8 Ohm.
P = 6.5 x 6.5/8 = 5.28 W
For 6.5Vrms you need supply voltage at least 20V.
Vs = 2 x 1.414 x 6.5 = 18.38 + saturation voltage of transistors.
For single ended class A you will need Iq (quiescent current) at least 1.2 A for 5W/8 Ohm.
Re: mj amp
this is one of those Mosquito/Zenquito designs that originally used JFETs upfront and Mosfets in the ops. In my simulation, it worked well, except that it has large cross-over distortion that i couldn't get rid of.
It originally attracted for its simplicity. and I would like to see other's experience with it as well.
Luke said:
this is one of those Mosquito/Zenquito designs that originally used JFETs upfront and Mosfets in the ops. In my simulation, it worked well, except that it has large cross-over distortion that i couldn't get rid of.
It originally attracted for its simplicity. and I would like to see other's experience with it as well.
Re: Re: mj amp
In case there is large cross-over distortion, can we say that it worked well?
millwood said:
In case there is large cross-over distortion, can we say that it worked well?
Re: Re: Re: mj amp
I think "it worked well except ..." actually is a diplomatic way of saying "it sucked because of ...", 🙂
PMA said:
I think "it worked well except ..." actually is a diplomatic way of saying "it sucked because of ...", 🙂
More to follow
I have built somthing close to to Ciuffoli design attached and it sounded grate. There is no voltage gain for a follower circuit and you will neen to build a voltage gain section unless you have a preammp with a large output swing and enough gain.
http://www.audiodesignguide.com/my/Follower_99c.gif
http://www.audiodesignguide.com/my/index.html#MY_FOLL
The Mosfet source follower should be built with a current source bias. An N channel mosfet will provide a lower ouput impedance and the speaker load should be in parrallel with the follower as in this circuit. I have used the IRF150 and IRF250 with great results. You need a huge heatsink.
The http://home.zonnet.nl/tschrama/owndesign.html
link doesn't work for me so I can't tell what the circuit under disscusion there iis. For a single ended mosfet follower like the rest of the circuits under disscussion there is no crossover distortion because there is no cross over between P and N channel devices.
Is the circuit under disscussin for the MOSquito tybe one on this page?
Merci,
Fred
http://perso.wanadoo.fr/jm.plantefeve/sche.html
I have built somthing close to to Ciuffoli design attached and it sounded grate. There is no voltage gain for a follower circuit and you will neen to build a voltage gain section unless you have a preammp with a large output swing and enough gain.
http://www.audiodesignguide.com/my/Follower_99c.gif
http://www.audiodesignguide.com/my/index.html#MY_FOLL
The Mosfet source follower should be built with a current source bias. An N channel mosfet will provide a lower ouput impedance and the speaker load should be in parrallel with the follower as in this circuit. I have used the IRF150 and IRF250 with great results. You need a huge heatsink.
The http://home.zonnet.nl/tschrama/owndesign.html
link doesn't work for me so I can't tell what the circuit under disscusion there iis. For a single ended mosfet follower like the rest of the circuits under disscussion there is no crossover distortion because there is no cross over between P and N channel devices.
Is the circuit under disscussin for the MOSquito tybe one on this page?
Merci,
Fred
http://perso.wanadoo.fr/jm.plantefeve/sche.html
Try the WINDing........or all choked up
"Go find (or wind) yourself a pair of big chokes. You´ll double the efficiency compared to a CCS design.
Something like 100mH is enough for 8 ohms load. There are some threads in this forum about choke loaded solid state amps, have a look."
The impedance of 100mH at 20 Hz is about 12.5 ohms so you are driving a much lower impedance than 8 ohm speaker load. An air core 100mH coil is several ohms and will get hot at a bias current of several amps. An iron core choke will saturate unless built with an air gap in the core and will still get very warm and dissipate several watts. You will not double your efficiency, decrease your power supply rejection, increase distortion and be faced with an enormous task designing (don't forget cooling in the design) and winding the choke. Other than all that it's a great idea.........
"Go find (or wind) yourself a pair of big chokes. You´ll double the efficiency compared to a CCS design.
Something like 100mH is enough for 8 ohms load. There are some threads in this forum about choke loaded solid state amps, have a look."
The impedance of 100mH at 20 Hz is about 12.5 ohms so you are driving a much lower impedance than 8 ohm speaker load. An air core 100mH coil is several ohms and will get hot at a bias current of several amps. An iron core choke will saturate unless built with an air gap in the core and will still get very warm and dissipate several watts. You will not double your efficiency, decrease your power supply rejection, increase distortion and be faced with an enormous task designing (don't forget cooling in the design) and winding the choke. Other than all that it's a great idea.........
Re: Re: Re: Re: mj amp
alternatively, you can improve your odds considerably by actually reading the posts before your fingers betray you, 🙂
Fred Dieckmann said:
alternatively, you can improve your odds considerably by actually reading the posts before your fingers betray you, 🙂
Fred Dieckmann:
I don´t agree with you at at every point.
In my 30W source follower amp I use 100mH chokes and I have full response down to 20Hz.
Of course more might be better, but at the price of size an weight. 100mH iron core chokes that can handle 3 A DC are big enough. Circlotron uses 85mH chokes in his follower and he seems happy with it.
The efficiency does indeed double compared to a constant current loaded amp. That is because of the fact that the choke "stores energy in it´s magnetic field" (lousy explanation, but...) and that energy drives the load in one half wave.
Or to put it simple: a choke loaded design is capable of twice the voltage swing from a given rail voltage.
Distortion and power supply rejection? I honestly don´t know...
Enormous task designing a choke?
Have a look at Circlotrons "My first ever class A amp" thread.
A pair of big iron cores an a few hundred turns of wire.
No need for HV insulation or interleaved windings or anything like that, as in tube amp stuff.
I don´t agree with you at at every point.
In my 30W source follower amp I use 100mH chokes and I have full response down to 20Hz.
Of course more might be better, but at the price of size an weight. 100mH iron core chokes that can handle 3 A DC are big enough. Circlotron uses 85mH chokes in his follower and he seems happy with it.
The efficiency does indeed double compared to a constant current loaded amp. That is because of the fact that the choke "stores energy in it´s magnetic field" (lousy explanation, but...) and that energy drives the load in one half wave.
Or to put it simple: a choke loaded design is capable of twice the voltage swing from a given rail voltage.
Distortion and power supply rejection? I honestly don´t know...
Enormous task designing a choke?
Have a look at Circlotrons "My first ever class A amp" thread.
A pair of big iron cores an a few hundred turns of wire.
No need for HV insulation or interleaved windings or anything like that, as in tube amp stuff.
Hi aiwonsi,
I made that website..... .. a long long .. very long time ago .. 
... At the time I was just beginning to understand electronics and was playing around with a Spice simulator.. I was just trying to see how a simple source-follower would perform.. There where no intensions at all to build it , just to show the performance as calculate by the spice simulator.. To make a real working amplifier out of it I suggest reading the ZEN articles and the www.tubecad.com ... then you'll learn enough to build a simple amplfier/power follower.. The current design needs a rimple free bias supply, a gate-snooper resistor, don't forget the terrible efficientcy of less than 10%... The Boys on the forum here have given you good advice.......read on 🙂
Please people.. it does not reflect my current state of understanding audio electronics
.. please save some tiny respect for me.. at least I had the nerve to admit I was the auteur.. I will take the website offline as soon as I remeber how I should do that.. .. reading the website I really don't know what I was thinking ... I think I had too much wine...
Regards,
Thijs
http://www.tubecad.com/page17.html
Now that's a website worth reading
I made that website.....
.. a long long .. very long time ago .. ... At the time I was just beginning to understand electronics and was playing around with a Spice simulator.. I was just trying to see how a simple source-follower would perform.. There where no intensions at all to build it , just to show the performance as calculate by the spice simulator.. To make a real working amplifier out of it I suggest reading the ZEN articles and the www.tubecad.com ... then you'll learn enough to build a simple amplfier/power follower.. The current design needs a rimple free bias supply, a gate-snooper resistor, don't forget the terrible efficientcy of less than 10%... The Boys on the forum here have given you good advice.......read on 🙂 Please people.. it does not reflect my current state of understanding audio electronics
.. please save some tiny respect for me.. at least I had the nerve to admit I was the auteur.. I will take the website offline as soon as I remeber how I should do that.. .. reading the website I really don't know what I was thinking ... I think I had too much wine...Regards,
Thijs
http://www.tubecad.com/page17.html
Now that's a website worth reading
I'll second Fred by reccomending the Power Follower 99c, mine have served me well and sound great, I'm just about to install them in my surround sound setup (yes, that's alot of heat, class-a amps power each speaker...)
Although you really don't have to use cerafines and all the boutique parts reccomended, any high quality part will do.
Although you really don't have to use cerafines and all the boutique parts reccomended, any high quality part will do.
- Status
- Not open for further replies.