Hi,
Carlos, I will send you a picture tonight and you tell me if it is readable for you, otherwise I can make a scan on next Monday. I have other versions of the 70W a well if you are interested?
Eric
Carlos, I will send you a picture tonight and you tell me if it is readable for you, otherwise I can make a scan on next Monday. I have other versions of the 70W a well if you are interested?
Eric
Yes, i am interested...please, prepare these scans
and send'm to uncle Charlie.
Thank you very much.
regards,
Carlos
and send'm to uncle Charlie.
Thank you very much.
regards,
Carlos
All right.... i will be waiting till Monday, January 3rd 2011
Thank you very much.... i will be waiting.
N'oubliez pas votre oncle Charles...do not forget your uncle.
My diet ask me to eat cooked eggs,...so.... i will have music and oven.
hehehehehehe.
Watch uncle charlie videos at the signature line (down links)..from Rio de Janeiro city...a french town..there; we call driver as "chauffeur"... house is "maison".... table is "buffet"
We had Nicolau Durand de Villegaignon... a french invasion in Rio.
regards,
Carlos
Thank you very much.... i will be waiting.
N'oubliez pas votre oncle Charles...do not forget your uncle.
My diet ask me to eat cooked eggs,...so.... i will have music and oven.
hehehehehehe.
Watch uncle charlie videos at the signature line (down links)..from Rio de Janeiro city...a french town..there; we call driver as "chauffeur"... house is "maison".... table is "buffet"
We had Nicolau Durand de Villegaignon... a french invasion in Rio.
regards,
Carlos
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Hi Eric,
Following our conversation yesterday, I thought we should post this to get some DIY member feedback. National Semi's LM117HV application sheet recommends putting in protection diode(s) if operating at a differential voltage greater than 25 V on the regulator, and if you have a cap at the output pin, both apply for this. Diode from output pin back to +Vin pin (cathode toward +Vin). supposed to create discharge path away from the regulator output pad for any start-up surge current from the cap/ or short to ground from the output pin. Could this help?
Another concern: On power up the output Op amp could be swinging up from the neg supply rail or down from the pos rail, until the op-amp output stabilizes. With higher power supply voltage applied now it may be enough to surpass the voltage limit of the LM117HV regulator. Maybe it is possible to limit the op amp transient or clamp the output effect only during power on ?
Following our conversation yesterday, I thought we should post this to get some DIY member feedback. National Semi's LM117HV application sheet recommends putting in protection diode(s) if operating at a differential voltage greater than 25 V on the regulator, and if you have a cap at the output pin, both apply for this. Diode from output pin back to +Vin pin (cathode toward +Vin). supposed to create discharge path away from the regulator output pad for any start-up surge current from the cap/ or short to ground from the output pin. Could this help?
Another concern: On power up the output Op amp could be swinging up from the neg supply rail or down from the pos rail, until the op-amp output stabilizes. With higher power supply voltage applied now it may be enough to surpass the voltage limit of the LM117HV regulator. Maybe it is possible to limit the op amp transient or clamp the output effect only during power on ?
Hi all,
Just notice, that all the replacement LM-117 (40V limited) blew up.....Dam it, I will have to wait for the HVK's to arrive to re run serious testing. The interesting thing is that everything still works, however at a lower power.
Eric
Just notice, that all the replacement LM-117 (40V limited) blew up.....Dam it, I will have to wait for the HVK's to arrive to re run serious testing. The interesting thing is that everything still works, however at a lower power.
Eric
We can make it discrete..just inform the input voltage, the output voltage
and the current....... and. with three power transistors plus a bunch of other componentes, we can make a huge regulator that will fit.
regards,
Carlos
and the current....... and. with three power transistors plus a bunch of other componentes, we can make a huge regulator that will fit.
regards,
Carlos
Carlos,
Parles-tu de l'amplificateur au complet ou seulement de la section de l'ampli opérationel?
Translation:
Are you talking about the entire amplifier or the Op-amp part of it?
Eric
Parles-tu de l'amplificateur au complet ou seulement de la section de l'ampli opérationel?
Translation:
Are you talking about the entire amplifier or the Op-amp part of it?
Eric
The regulator...the supply.... to substitute the chip you have burned
Le regulateur du puissance electrique.
Carlos
Le regulateur du puissance electrique.
Carlos
It makes sense, however for now, I want to make this one work first! 😀
The supply rail voltage should be about +- 39,5 V with an idle current of 1,85 Amps for 87 watts 8 Ohms or 2.7 Amps (my estimated guess because no precise info in the article) for the maximum power of 129 Watts, Cheers!
The supply rail voltage should be about +- 39,5 V with an idle current of 1,85 Amps for 87 watts 8 Ohms or 2.7 Amps (my estimated guess because no precise info in the article) for the maximum power of 129 Watts, Cheers!
I don't see the arithmetic for your quoted powers, but there is something wrong.
If the bias is set to 1A then a push pull amplifier leaves ClassA when the output current reaches twice that (2Apk)
If you set your bias to 1.85A then the ClassA limit is 3.7Apk. It is ClassAB if you ask the amp to deliver any more.
The maximum ClassA power is Ipk^2 * Rload / 2 when the signal is a sinewave.
your 1,85A of bias will allow up to 54W into an 8r0 load.
Similarly 2.7A bias allows up to 116W of ClassA into an 8r0 load. NO !
To push 5.4Apk into 8r0 you need 43.2Vpk at the speaker terminal.
Allow another 1v to 3V lost through the output stage and the supply rails would need to be ~+-44Vdc to +-47Vdc to get your 116W.
Starting from +-39.5Vdc, expect <90W of ClassA into 8r0 when bias is set to ~2.4A
If the bias is set to 1A then a push pull amplifier leaves ClassA when the output current reaches twice that (2Apk)
If you set your bias to 1.85A then the ClassA limit is 3.7Apk. It is ClassAB if you ask the amp to deliver any more.
The maximum ClassA power is Ipk^2 * Rload / 2 when the signal is a sinewave.
your 1,85A of bias will allow up to 54W into an 8r0 load.
Similarly 2.7A bias allows up to 116W of ClassA into an 8r0 load. NO !
To push 5.4Apk into 8r0 you need 43.2Vpk at the speaker terminal.
Allow another 1v to 3V lost through the output stage and the supply rails would need to be ~+-44Vdc to +-47Vdc to get your 116W.
Starting from +-39.5Vdc, expect <90W of ClassA into 8r0 when bias is set to ~2.4A
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Hi,
This amplifier is a full class A, no A-B, No push pull. Is has 2 IRF-150 transistors on the + side of the rail and LM117 HVK's on the - side of the rail mid point 0V (schematic on post 1). The other version on post 22 has a mid point of +39,5.
The quoted powers are from the text (except the one I guessed) it says that it is at 1Khz signal.
Eric
This amplifier is a full class A, no A-B, No push pull. Is has 2 IRF-150 transistors on the + side of the rail and LM117 HVK's on the - side of the rail mid point 0V (schematic on post 1). The other version on post 22 has a mid point of +39,5.
The quoted powers are from the text (except the one I guessed) it says that it is at 1Khz signal.
Eric
No, i have not, but i am the one made the mistake
I gave you a wrong email adress...i am very sorry.... i have checked the post 40 and i found that i made the mistake (once again!)
Well.... 60 years old makes a huge difference...i am having problems with attention....the correct adress is:
nanabrother@hotmail.com
The yahoo adress does not exists... sorry...my mistake Arick.
If you have patience to upload once again, then i will be gratefull..if you decide not to upload to the retarded uncle, then i will understand you.
Try to find the message and forward it to nanabrother@hotmail.com...this way you will not have to upload it once again.
regards,
Carlos
I gave you a wrong email adress...i am very sorry.... i have checked the post 40 and i found that i made the mistake (once again!)
Well.... 60 years old makes a huge difference...i am having problems with attention....the correct adress is:
nanabrother@hotmail.com
The yahoo adress does not exists... sorry...my mistake Arick.
If you have patience to upload once again, then i will be gratefull..if you decide not to upload to the retarded uncle, then i will understand you.
Try to find the message and forward it to nanabrother@hotmail.com...this way you will not have to upload it once again.
regards,
Carlos
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Hi Eric,
I sent you a data sheet of the TL783 regulators, I had a quick browse of the specs and they will handle about double the voltage differential than the LM HVKs. They will easily sink 350 mA at 40 Volts. Worth a try..they cost a LOT less than the HVKs. The ripple rejection looks comparable to the LM317s, but best to check that out before jumping to a conclusion.
I sent you a data sheet of the TL783 regulators, I had a quick browse of the specs and they will handle about double the voltage differential than the LM HVKs. They will easily sink 350 mA at 40 Volts. Worth a try..they cost a LOT less than the HVKs. The ripple rejection looks comparable to the LM317s, but best to check that out before jumping to a conclusion.
Hi Arik, it is amplifier with nice components, you blow it?
LM317/117 has only 20Wmax dissipation @25Celcius, plus heated and heat resistance of TO220 package with isolator it may less than 10W for that huge heatsink. That mean it blow in 0.25A 40V. Use safe voltage or use a way to save it, track its voltage to work in half or 1/4 voltages or something else.
LM317/117 has only 20Wmax dissipation @25Celcius, plus heated and heat resistance of TO220 package with isolator it may less than 10W for that huge heatsink. That mean it blow in 0.25A 40V. Use safe voltage or use a way to save it, track its voltage to work in half or 1/4 voltages or something else.
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