Dangerous 68 bangs Firecracker !
It could work , but be sure your mains is never above 230 Volts !!
The transformer datasheet specs a no load voltage of 53.42 Volts AC at 230V primary .
This equals 74.6 V DC per rail .
I wouldn't be comfortable with 75V capacitors and the amp with this Voltage !!
Cheers ,
Rens
It could work , but be sure your mains is never above 230 Volts !!
The transformer datasheet specs a no load voltage of 53.42 Volts AC at 230V primary .
This equals 74.6 V DC per rail .
I wouldn't be comfortable with 75V capacitors and the amp with this Voltage !!
Cheers ,
Rens
Last edited:
1) Nope
2) Yes 220 µF x 68pcs. = 14960µF
1) 2 pcs. of this Tr. Buy Toroidal Transformers 2 Output Toroidal Transformer, 500VA, 35 V ac Nuvotem Talema 0500P1-2-035K online from RS for next day delivery.
http://www.diyaudio.com/forums/power-supplies/177149-two-transformer-power-supply-wiring.html
Let me google that for you
it's 68 caps in total , 34 each rail , so 7480 uF per rail . that's fine .
Rabati did not state his home mains Voltage . But I assume it's 230Volts .
35 Volts AC is not enough Voltage for L25D ( It would run , but not designed for this Voltage) it would suit the L15D .
His 2 X 50V transformer could work fine if he upgrades the capacitors to a higher Voltage of at least 80 or better 100 Volts .
Cheers ,
Rens
hello everybody
i have one question
i have bought to peces of IRAUD200 Momo Class D
YZ IRAUD200 2 Momo Class D Power Amplifier Board IRFB23N20D IRS2092S 500W CL 145 | eBay
and this smps 1200 Watts Switching Power Supply for Audio Power
1200 Watts Switching Power Supply for Audio Power Amplifier Board Assemble | eBay
the smps delivert 54 vdc
and now my question
the best performance for the board ist nearly by 70 volts
otherwis in the dicription of the board called
Voltage Range: DC ± 20 to ± 70V (if the supply voltage less than ± 40V, the 2 pcs 3K / 3W resistor needs replaced 1.5K / 3W resistor)
can i change the resistor nearly to 2k5 or other for a better perfomce of the board
soory for my poor englich
i have one question
i have bought to peces of IRAUD200 Momo Class D
YZ IRAUD200 2 Momo Class D Power Amplifier Board IRFB23N20D IRS2092S 500W CL 145 | eBay
and this smps 1200 Watts Switching Power Supply for Audio Power
1200 Watts Switching Power Supply for Audio Power Amplifier Board Assemble | eBay
the smps delivert 54 vdc
and now my question
the best performance for the board ist nearly by 70 volts
otherwis in the dicription of the board called
Voltage Range: DC ± 20 to ± 70V (if the supply voltage less than ± 40V, the 2 pcs 3K / 3W resistor needs replaced 1.5K / 3W resistor)
can i change the resistor nearly to 2k5 or other for a better perfomce of the board
soory for my poor englich
The two 3k resistors are R117 and R118 in the IR reference design .
They are valued 3k3 at +/- 50V supply in this design , so no change is needed .
They feed the IRS2092 +VAA and -VSS zeners and have no direct influence on the sound quality of the amp .
Cheers ,
Rens
Sorry for the newbie question, how can you tel it is +60V only since there are also three -V connection points in the picture. I am confused by these switching PSU from EBAY.
Regards,
There's no "0" Volt connection and the power is 400W ( 60V x 6.6A=396W)
If it was dual rail +/- 60V 6.6A the power would be 120V x 6.6A=792W
Don't mistake the main ground for the 0 V connection .
Cheers ,
Rens
Thanks! That was why I was confused - I calculated the wattage and get the same number as you did and it did not jive based on voltage difference(120V). Now what does that -V connection means ==> 0V, ground?
And if one use this PSU, the voltage available will only be 60 instead of 120V, right?
Regards,
and a another short questin from a newbi🙂
make it sense to change the buffer capacitor to low esr types und a higher value,in this moment its working 1800 uf 381lx types ther is not a low ers type
and bypassed the same by smart kp1832 8900pf and and a smart nsf styroflex 2700 pf
- C 1800uf -
I I
- kp1832 8900pf-
I I
- nsf 2700pf -
i like the sound of the kp1832 in other amps ,it makes the sound in the high frequens opener smother and my girl friend says ther are a much more colors in the sound
make it sense to change the buffer capacitor to low esr types und a higher value,in this moment its working 1800 uf 381lx types ther is not a low ers type
and bypassed the same by smart kp1832 8900pf and and a smart nsf styroflex 2700 pf
- C 1800uf -
I I
- kp1832 8900pf-
I I
- nsf 2700pf -
i like the sound of the kp1832 in other amps ,it makes the sound in the high frequens opener smother and my girl friend says ther are a much more colors in the sound
can the L20D drive an ESL?
Can anyone suggest if this amp can drive an electrostatic speaker? Specifically a Martin Logan CLS IIa. As known ESL's are highly capacitive and dificult loads. The CLS IIa impedance is rated 4 OHMs, but dips to some 1 OHM or even less at around 20 kHz.
Will the L20D drive such a load?
Thanks!
Can anyone suggest if this amp can drive an electrostatic speaker? Specifically a Martin Logan CLS IIa. As known ESL's are highly capacitive and dificult loads. The CLS IIa impedance is rated 4 OHMs, but dips to some 1 OHM or even less at around 20 kHz.
Will the L20D drive such a load?
Thanks!
A very intelligent, informative and helpful answer.
Thank you very much for the good will and effort.
Well, I differ to beg with at least one of the posters, insofar as I'm currently driving a pair of ML Sequel 2's with these amps and the results are quite satisfactory.
However, these ML's have been much modified (to the point that Wife K refers to them as "Martian-Logans"), their bias voltage is now at 4.2KV, their crossovers have been replaced by a simple resistive network and all crossover, EQ, and response shaping is done in the digital domain, and their upper response is being rolled off from 18 KHz at 24 dB/octave.
All of which makes these panels much less reactive and less difficult to drive. I'm not sure how well your CLS's would suffer this sort of abuse, but the Sequels have been brought back from the dead.
The amp modules are mounted in a pair of old B&K chassis, and make full use of their fairly stiff +/-60 VDC linear power supplies, with their only mod being the large PS caps bypassed with some 1500uF URZA low ESR caps - this was a fairly dreadful, temporary hack - but they sound so damn decent that I'm reluctant to 'improve' them.
Cheers
Jim
I believe you should be fine with 2 Ohms if you swap the 2 irfb4020's out with irfb5615's and keep the voltage below +/-60v.
Sent from my Nexus 7 using Tapatalk
Thank you!
First impression from your NO answer was that it is just a tease.
Now I understand better.
Hello and sorry for the delay in answer.
I bought a toroidal with double exit and all is ok...
I'm now finishing the assembly and ready to test the whole amplifier..
Thanks for the answer...
I bought a toroidal with double exit and all is ok...
I'm now finishing the assembly and ready to test the whole amplifier..
Thanks for the answer...
Hello,
I bought a pair of the L25D (mono) a few months ago. The output inductors are running very hot, up to 80 deg Celsius. I afraid the whole amp will blow one day, so I open up the inductors, rewind with Litz wire, and now the inductors stay below 50 deg Celsius. Any comment on this ?
Thanks.
I bought a pair of the L25D (mono) a few months ago. The output inductors are running very hot, up to 80 deg Celsius. I afraid the whole amp will blow one day, so I open up the inductors, rewind with Litz wire, and now the inductors stay below 50 deg Celsius. Any comment on this ?
Thanks.
open up the inductors, rewind with Litz wire。What does it mean？
So that the copper wire exposed?