Je publierai la cause du bourdonnement et l'une des solutions.
Cause of Hum. (S-150mk2)
https://youtu.be/SYG2WYpisY0
Resolve Hum. (S-150mk2)
https://youtu.be/saIzovDrFtw
Ham may be a concern with high-efficiency speakers.
The cause was the structure that transmits 24V DC from [CN14] to the power saving board.
Humming can be reduced by modifying the power saving board so that it can operate without this 24V DC supply.
In the power saving board, this 24V is used to turn on the delay relay to suppress the inrush current.
The power saving function of the power saving board is realized by the 12V relay,
but this is removed and this 12V relay is transplanted as a delay relay to suppress the inrush current.
Add one resistor to the delay relay drive circuit and modify it so that the delay function is realized even with a 12V power supply.
In Japan, there were cases where the relay did not turn on because the power supply voltage was low. This was solved by using low VF Schottky diodes and increasing the voltage after rectification.
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Modérateurs: Modération Forum Home-Cinéma, Le Bureau de l’Association HCFR • Utilisateurs parcourant ce forum: Did77, nightwish_daisuki et 15 invités
Discussion sur les amplis et blocs de puissance multi-canaux pour le HomeCinéma
avis ampli t.amp s150 mk2
Dernière édition par nightwish_daisuki le 12 Mai 2021 19:26, édité 1 fois.
- nightwish_daisuki
- Messages: 37
- Inscription Forum: 12 Mai 2021 18:06
- Localisation: Japan
One speaker cable inside the amplifier is omitted (it is P3).
The sound quality improved when I added one and remodeled it to four.
[Picture of P3]
https://youtu.be/WGUzWLhWx2A
https://youtu.be/qziREmb0PCs
The sound quality improved when I added one and remodeled it to four.
[Picture of P3]
https://youtu.be/WGUzWLhWx2A
https://youtu.be/qziREmb0PCs
Dernière édition par nightwish_daisuki le 12 Mai 2021 19:31, édité 2 fois.
- nightwish_daisuki
- Messages: 37
- Inscription Forum: 12 Mai 2021 18:06
- Localisation: Japan
nightwish_daisuki a écrit:Je publierai la cause du bourdonnement et l'une des solutions.
Cause of Hum. (S-150mk2)
https://youtu.be/SYG2WYpisY0
Resolve Hum. (S-150mk2)
https://youtu.be/saIzovDrFtw
Ham may be a concern with high-efficiency speakers.
The cause was the structure that transmits 24V DC from [CN14] to the power saving board.
Humming can be reduced by modifying the power saving board so that it can operate without this 24V DC supply.
In the power saving board, this 24V is used to turn on the delay relay to suppress the inrush current.
The power saving function of the power saving board is realized by the 12V relay,
but this is removed and this 12V relay is transplanted as a delay relay to suppress the inrush current.
Add one resistor to the delay relay drive circuit and modify it so that the delay function is realized even with a 12V power supply.
In Japan, there were cases where the relay did not turn on because the power supply voltage was low. This was solved by using low VF Schottky diodes and increasing the voltage after rectification.
Whaouhhh...Ca c'est de l'info ! Merci nightwish_daisuki !
Dommage que j'ai 2 bras gauches, et que j'ai peur de faire une bêtise.....mais je vais bien trouver une "âme charitable" qui pourra me faire la modif
La configuration dans mon profil
"La Musique est la langue des Emotions" Emmanuel Kant
-
alfachris - Membre HCFR
- Messages: 8582
- Inscription Forum: 12 Aoû 2003 21:36
- Localisation: 95
nightwish_daisuki a écrit:One speaker cable inside the amplifier is omitted (it is P3).
The sound quality improved when I added one and remodeled it to four.
[Picture of P3]
https://youtu.be/WGUzWLhWx2A
https://youtu.be/qziREmb0PCs
Là aussi...merci!
La configuration dans mon profil
"La Musique est la langue des Emotions" Emmanuel Kant
-
alfachris - Membre HCFR
- Messages: 8582
- Inscription Forum: 12 Aoû 2003 21:36
- Localisation: 95
Thomann cachait la banane.
Only the plastic parts can be drilled.
Be careful not to perforate metal parts.
https://youtu.be/vAtJlVwUc2Y
Only the plastic parts can be drilled.
Be careful not to perforate metal parts.
https://youtu.be/vAtJlVwUc2Y
- nightwish_daisuki
- Messages: 37
- Inscription Forum: 12 Mai 2021 18:06
- Localisation: Japan
Hello,
Thank you for thoses informations !
Well, It seems that the "hum mod" is not quite easy ... at least needs some real modifications. I was hopping a easy, and straight forward, one
About the P3 cable : same thing with xlr output or not ?
Thx
Thank you for thoses informations !
Well, It seems that the "hum mod" is not quite easy ... at least needs some real modifications. I was hopping a easy, and straight forward, one
About the P3 cable : same thing with xlr output or not ?
Thx
- Gug42
- Messages: 1651
- Inscription Forum: 16 Nov 2007 15:20
Gug42 a écrit:Hello,
Thank you for thoses informations !
Well, It seems that the "hum mod" is not quite easy ... at least needs some real modifications. I was hopping a easy, and straight forward, one
About the P3 cable : same thing with xlr output or not ?
Thx
Hi, Gug42
'P3' is Just 'Ground'. (GND)
It is the best place to path the return current from the loudspeakers in a 'Single ended' amplifier.
However, when used with a monaural amplifier in 'bridged' (BTL) mode, it does not become the current path from the loudspeaker.
So in 'bridged' mode (BTL) it can be said to be the same as XLR's GND.
References:
https://en.wikipedia.org/wiki/Push%E2%80%93pull_output
https://en.wikipedia.org/wiki/Bridged_a ... al_circuit
https://www.thomann.de/gb/tamp_s75.htm
- nightwish_daisuki
- Messages: 37
- Inscription Forum: 12 Mai 2021 18:06
- Localisation: Japan
alfachris a écrit:nightwish_daisuki a écrit:Je publierai la cause du bourdonnement et l'une des solutions.
Cause of Hum. (S-150mk2)
https://youtu.be/SYG2WYpisY0
Resolve Hum. (S-150mk2)
https://youtu.be/saIzovDrFtw
Ham may be a concern with high-efficiency speakers.
The cause was the structure that transmits 24V DC from [CN14] to the power saving board.
Humming can be reduced by modifying the power saving board so that it can operate without this 24V DC supply.
In the power saving board, this 24V is used to turn on the delay relay to suppress the inrush current.
The power saving function of the power saving board is realized by the 12V relay,
but this is removed and this 12V relay is transplanted as a delay relay to suppress the inrush current.
Add one resistor to the delay relay drive circuit and modify it so that the delay function is realized even with a 12V power supply.
In Japan, there were cases where the relay did not turn on because the power supply voltage was low. This was solved by using low VF Schottky diodes and increasing the voltage after rectification.
Whaouhhh...Ca c'est de l'info ! Merci nightwish_daisuki !
Dommage que j'ai 2 bras gauches, et que j'ai peur de faire une bêtise.....mais je vais bien trouver une "âme charitable" qui pourra me faire la modif
Salut Alfa, je suis preneur d’un tir groupé si jamais tu trouves quelqu’un pour faire la modif, le miens ronronne aussi et comme je suis également ds 95, fais moi signe
- damdam95
- Messages: 353
- Inscription Forum: 26 Sep 2005 22:20
- Localisation: VAL D'OISE
Je vais attendre de recevoir mes nouveaux amplis, avant de faire modifier les T.Amp... mais c'est ok je te fais signe dès que je trouve quelqu'un
La configuration dans mon profil
"La Musique est la langue des Emotions" Emmanuel Kant
-
alfachris - Membre HCFR
- Messages: 8582
- Inscription Forum: 12 Aoû 2003 21:36
- Localisation: 95
bonsoir a tous j ai fais la modif pour inserer les fiches bananes,ça marche mais allez-y tout doux car l epaisseur de plastique est fine pour ne pas abimée la partie metalique de la fiche ,méche de 5mn suffisante,bonne soirée.
- will3230
- Membre HCFR
- Messages: 15
- Inscription Forum: 25 Jan 2021 17:51
Pour le hum, s'il s'agit du softstart qui fout le bordel, autant le changer plutôt que de modifier celui d'origine - la modif m'a l'air tout de même hasardeuse
Si quelqu'un veut m'envoyer son modèle, je regarderai ce que je peux proposer en plus "simple" pour tout le monde.
Si quelqu'un veut m'envoyer son modèle, je regarderai ce que je peux proposer en plus "simple" pour tout le monde.
- guyome
- Messages: 9029
- Inscription Forum: 25 Avr 2001 2:00
- Localisation: Savoie
guyome a écrit:Pour le hum, s'il s'agit du softstart qui fout le bordel, autant le changer plutôt que de modifier celui d'origine - la modif m'a l'air tout de même hasardeuse
Si quelqu'un veut m'envoyer son modèle, je regarderai ce que je peux proposer en plus "simple" pour tout le monde.
Je peux t'envoyer l'un des miens, maintenant que j'ai mes amplis ....appelle-moi
La configuration dans mon profil
"La Musique est la langue des Emotions" Emmanuel Kant
-
alfachris - Membre HCFR
- Messages: 8582
- Inscription Forum: 12 Aoû 2003 21:36
- Localisation: 95
Content de voir que tu as récupéré tes amplis.
- Did77
- Messages: 838
- Inscription Forum: 30 Déc 2003 21:10
- Localisation: Guingamp
Did not work!!
In fact, the modifications shown in "Resolve Hum.(S-150mk2)" Did not work.
It may be solved by slowing down the charging current to the bulk capacitor. By "small-L".
https://youtu.be/q9jedS8ukUw
Postscript1:Good News.
When I inserted the choke coil between the diode and the bulk capacitor, the hum disappeared.
The resistor is inserted for the purpose of absorbing the transient high voltage generated by the coil.
Without this resistor there is a risk of damaging the diode.
These value should be considered in the future as it is a parameter that affects sound quality.
Due to the effect of this choke coil, the hum is as small as the "S-75mk2".
Postscript2:
I think I didn't need a resistor connected in parallel with the choke.
For example, the choke of a tube amp does not have a resistor attached.
In fact, the modifications shown in "Resolve Hum.(S-150mk2)" Did not work.
It may be solved by slowing down the charging current to the bulk capacitor. By "small-L".
https://youtu.be/q9jedS8ukUw
nightwish_daisuki a écrit:Je publierai la cause du bourdonnement et l'une des solutions.
Cause of Hum. (S-150mk2)
https://youtu.be/SYG2WYpisY0
Resolve Hum. (S-150mk2)
https://youtu.be/saIzovDrFtw
The following is omitted.
Postscript1:Good News.
When I inserted the choke coil between the diode and the bulk capacitor, the hum disappeared.
The resistor is inserted for the purpose of absorbing the transient high voltage generated by the coil.
Without this resistor there is a risk of damaging the diode.
These value should be considered in the future as it is a parameter that affects sound quality.
Due to the effect of this choke coil, the hum is as small as the "S-75mk2".
Postscript2:
I think I didn't need a resistor connected in parallel with the choke.
For example, the choke of a tube amp does not have a resistor attached.
Dernière édition par nightwish_daisuki le 07 Juin 2021 12:13, édité 2 fois.
- nightwish_daisuki
- Messages: 37
- Inscription Forum: 12 Mai 2021 18:06
- Localisation: Japan
Autant enlever le softstart puisque c'est lui qui fait engendre le bruit - le transfo est trop petit pour que cela soit vraiment nécessaire...
Christian, si tu veux m'envoyer un de tes exemplaires ?
Christian, si tu veux m'envoyer un de tes exemplaires ?
- guyome
- Messages: 9029
- Inscription Forum: 25 Avr 2001 2:00
- Localisation: Savoie
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