Hi eveyone;
input will be +19 -19 volt instead of 18v.
Orginal Layout
My pcb
They are not the same because pcb complated in 2012 but update relased in 2003. I cound not find a better one.
can tell me, the capacitor voltages & resistor watt on JLH2003 here below;
depends on my pcb.
220UF c2 & c3?
470uf c1?
330pf c10?
Watt value of 10ohm R15 and rest of all resistor 1/4 or 1/8W ?
Thanks in advance.
input will be +19 -19 volt instead of 18v.
Orginal Layout
My pcb
An externally hosted image should be here but it was not working when we last tested it.
They are not the same because pcb complated in 2012 but update relased in 2003. I cound not find a better one.
can tell me, the capacitor voltages & resistor watt on JLH2003 here below;
depends on my pcb.
220UF c2 & c3?
470uf c1?
330pf c10?
Watt value of 10ohm R15 and rest of all resistor 1/4 or 1/8W ?
Thanks in advance.
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C2 and C3 appear to be across the supply. So for -/+ 19 volts DC you need 25 volt or higher caps.
C1 I can't determine from the PCB but suspect it is the NFB return. Use a 35 or 63 volt part.
C10 can be a 50 volt part (about the lowest value you can get for a 330pf)
R10. Is that part of a zobel network ? Use a 2 watt carbon or metal film.
C1 I can't determine from the PCB but suspect it is the NFB return. Use a 35 or 63 volt part.
C10 can be a 50 volt part (about the lowest value you can get for a 330pf)
R10. Is that part of a zobel network ? Use a 2 watt carbon or metal film.
Can anybody help me in this thread;
http://www.diyaudio.com/forums/powe...-supply-jlh2003-f5-amplifier.html#post4947942
http://www.diyaudio.com/forums/powe...-supply-jlh2003-f5-amplifier.html#post4947942
Good morning all,
I am getting involved in this subject which dates from 2017, but I am thinking of using this version of this amplifier too. currently I received the JLH1969 version with 2 transistors of which I will place MJ15023 instead of 2n3055 as expected, although I have a lot in stock.
i would like to get a review of this amplifier as it uses dual power supply, except the JLH 1969 has single power supply.
I cannot give any insight at this time, because I just received my JLH1969 CIs from Aliexpress. I will mount them and use a torid of 2X12VAC which will give me after rectification 16.92v - 1.4v of the diodes gives me +/- 15.5vdc which should give me in principle by theory 5.5W at 8 ohms if I'm not mistaken.
the toroidal is designed for 2 channels with 300VA
like that each amp receives its rectification and filtering independently, I still have to test, if not then I place the windings in parallel if I have hum or buzz.
to be continued but I will open a new post with titled JLH 1969 + JLH2003
I am getting involved in this subject which dates from 2017, but I am thinking of using this version of this amplifier too. currently I received the JLH1969 version with 2 transistors of which I will place MJ15023 instead of 2n3055 as expected, although I have a lot in stock.
i would like to get a review of this amplifier as it uses dual power supply, except the JLH 1969 has single power supply.
I cannot give any insight at this time, because I just received my JLH1969 CIs from Aliexpress. I will mount them and use a torid of 2X12VAC which will give me after rectification 16.92v - 1.4v of the diodes gives me +/- 15.5vdc which should give me in principle by theory 5.5W at 8 ohms if I'm not mistaken.
the toroidal is designed for 2 channels with 300VA
like that each amp receives its rectification and filtering independently, I still have to test, if not then I place the windings in parallel if I have hum or buzz.
to be continued but I will open a new post with titled JLH 1969 + JLH2003
I have just completed this project a couple weeks ago, but which board do you use? Please, tell us more!
hello,
there is a lot to read.
for the moment I am on page 20 but it does not really correspond with my current PCBs.
Phil
there is a lot to read.
for the moment I am on page 20 but it does not really correspond with my current PCBs.
Phil
@titoon
I perfectly understand your concern.
That thread is gigantic and contains information on multiple versions, multiple sets of components, multiple choices of predominantly antique (obsolete) transistors with focus on the original 1969 version. It is difficult to find specific information on newer versions. I am particularly interested Geoff Moss's 2005 version but the real information is buried in a vast composite thread.
Should we try a separate thread focused on this particular version to avoid indeed confusing original 10W thread?
Could you be a bit more specific on your JLH project: PCB, components etc..
Regards
I perfectly understand your concern.
That thread is gigantic and contains information on multiple versions, multiple sets of components, multiple choices of predominantly antique (obsolete) transistors with focus on the original 1969 version. It is difficult to find specific information on newer versions. I am particularly interested Geoff Moss's 2005 version but the real information is buried in a vast composite thread.
Should we try a separate thread focused on this particular version to avoid indeed confusing original 10W thread?
Could you be a bit more specific on your JLH project: PCB, components etc..
Regards
@Berlusconi
I will do my post on the JLH 1969 and JLH 2003 with MJ15003.
I still have old stock of 2N3055 and MJ 15022 X6 pcs and MJ 15023 x 4 pcs and MJ21194 x 7 pcs.
I could compare the sound as well.
my 1969 JLH PCB is pictured on # 6
here is my project on which I work in parallel with the repair of a BGW750B currently on this forum
the whole will be a piece of metal and wood, for the moment it is on paper.
top to bottom description:
Dual 1228 plate (I only keep the mechanism, its frame will be completely redone in the new complete support.
Raspberry Pi3 B + with its DAC and touch screen and Dvd rom + USB RTL2832 (Dab), I have not yet defined whether I am running on Kodi or volumio or raspbian.
Seen meters: not yet decided nor really chosen to place any: see the aesthetics that this represents with all of all the components
2 preamp with BASS-Medium-Treble-balance and volume and loudness settings if possible for each amplifier + source selector (Phono + raspberry + Aux) + general volume.
JLH 1969 2x10Watts amplifier equipped with MJ15003 on 1 300VA 2x12vac transformer
amplifier JLH 2003 2 x 22Watts equipped with Mj15003 on 1 transformer 500VA 2 x 18vac
capacitive filtering of the power supply not yet defined.
ignition switch for each type of amplifier
HP protection
Phil
I will do my post on the JLH 1969 and JLH 2003 with MJ15003.
I still have old stock of 2N3055 and MJ 15022 X6 pcs and MJ 15023 x 4 pcs and MJ21194 x 7 pcs.
I could compare the sound as well.
my 1969 JLH PCB is pictured on # 6
here is my project on which I work in parallel with the repair of a BGW750B currently on this forum
the whole will be a piece of metal and wood, for the moment it is on paper.
top to bottom description:
Dual 1228 plate (I only keep the mechanism, its frame will be completely redone in the new complete support.
Raspberry Pi3 B + with its DAC and touch screen and Dvd rom + USB RTL2832 (Dab), I have not yet defined whether I am running on Kodi or volumio or raspbian.
Seen meters: not yet decided nor really chosen to place any: see the aesthetics that this represents with all of all the components
2 preamp with BASS-Medium-Treble-balance and volume and loudness settings if possible for each amplifier + source selector (Phono + raspberry + Aux) + general volume.
JLH 1969 2x10Watts amplifier equipped with MJ15003 on 1 300VA 2x12vac transformer
amplifier JLH 2003 2 x 22Watts equipped with Mj15003 on 1 transformer 500VA 2 x 18vac
capacitive filtering of the power supply not yet defined.
ignition switch for each type of amplifier
HP protection
Phil
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Very good
@titoon
Very good. I might also build an original 1969 too. Comparison would be rather interesting.
@titoon
Very good. I might also build an original 1969 too. Comparison would be rather interesting.
When you finish reading, you will realize that JLH1969 is characterized by constant high
heat 🙂
Perhaps it would be wise to build a separate module that includes the class A amplifier itself and the power supply.
You can read not only from the beginning, but also from the end, closer to the production date of your Chinese set 🙂
heat 🙂
Perhaps it would be wise to build a separate module that includes the class A amplifier itself and the power supply.
You can read not only from the beginning, but also from the end, closer to the production date of your Chinese set 🙂
... Even faster: after setting the bias, significant dissipation of heat becomes clear. But that is one should be aware of from the very beginning. It is saddening to see some people trying to solve the "problem" by running at low bias but this isn't either-or. A massive heat sink is obligatory and should be purchased first.
🙂
@Berlusconi
I am that the class A produces much more temperature than sound, that I am well aware of. here what I want to do with the two types of assembly JLH1969 and JLH 2003 is to mount a simple amplifier and to be able to initiate myself to different tests on it, when I speak of test it is obvious that I will try on a turntable other than the one I would have realized on the diagrams, make tests with other components like those they already tested on the pages of the forum.
for cooling I have 4 same model that I can attributed to the JLH 1969, they come from variable speed drives of my company that I recover, I am a maintenance technician there, I think a cooler by Mj15003 will be good enough ,for the JLH2003 I have another larger model.
if you have read my project it is not simple and small in volume, my idea is to be able to have the amplifier on the sides of the side walls with my raspberry and 7 "touch screen on the front, as well as its DVDrom for audio CD playback via the DAC, I still have to look for the preamp which will have to accept the Raspberry and also the Dual 1228 vinyl turntable.
for the balance of this set; I will place the 4 Toroidal transformers in the base to keep a good stability. I think the height of the whole will be close to 90cm.
project in full study and reflection but which will be carried out anyway. currently I finished repairing a BGW750B before being able to recover my work bench and devote myself to it full time.
Phil
I am that the class A produces much more temperature than sound, that I am well aware of. here what I want to do with the two types of assembly JLH1969 and JLH 2003 is to mount a simple amplifier and to be able to initiate myself to different tests on it, when I speak of test it is obvious that I will try on a turntable other than the one I would have realized on the diagrams, make tests with other components like those they already tested on the pages of the forum.
for cooling I have 4 same model that I can attributed to the JLH 1969, they come from variable speed drives of my company that I recover, I am a maintenance technician there, I think a cooler by Mj15003 will be good enough ,for the JLH2003 I have another larger model.
if you have read my project it is not simple and small in volume, my idea is to be able to have the amplifier on the sides of the side walls with my raspberry and 7 "touch screen on the front, as well as its DVDrom for audio CD playback via the DAC, I still have to look for the preamp which will have to accept the Raspberry and also the Dual 1228 vinyl turntable.
for the balance of this set; I will place the 4 Toroidal transformers in the base to keep a good stability. I think the height of the whole will be close to 90cm.
project in full study and reflection but which will be carried out anyway. currently I finished repairing a BGW750B before being able to recover my work bench and devote myself to it full time.
Phil
Attachments
EMC for you English speaker I think you mean for us European EMI like in this photo.
I often have this on my electronic drives to avoid phase harmonies and I planned to place one in the assembly
Attachments
Hello Phil! 🙂
I have used two flat back heat sinks with 0.3 C/W for JLH2005 with two pairs of MJ 15003 per channel. Please, refer to the photo below. I was able to maintain temperatures below 75 °C but I still consider using fans, at least during summer. Contemporary fans are practically inaudible so I consider them as a viable solution. I have tested the boards with common class A power supply but the final version will be using capacitance multiplier. Perhaps I make two completely separate mono-blocks. I will finish this project with pretty chassis because quality of sound deserves it.
Good luck.
I have used two flat back heat sinks with 0.3 C/W for JLH2005 with two pairs of MJ 15003 per channel. Please, refer to the photo below. I was able to maintain temperatures below 75 °C but I still consider using fans, at least during summer. Contemporary fans are practically inaudible so I consider them as a viable solution. I have tested the boards with common class A power supply but the final version will be using capacitance multiplier. Perhaps I make two completely separate mono-blocks. I will finish this project with pretty chassis because quality of sound deserves it.
Good luck.
nice, you also work with stainless steel I see for the angles on the heatsink.
What kind of preamp are you using with this?
how did you place the transistors for with the 2 L aluminum face to face, to connect the MJ15003 on the PCB ?
sorry for my english, i use google translate most often
What kind of preamp are you using with this?
how did you place the transistors for with the 2 L aluminum face to face, to connect the MJ15003 on the PCB ?
sorry for my english, i use google translate most often
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