The Indian catalog thing
Indian Catalog Thing
Gives a contact in New Delhi at the end....
205 Hemkundt House 2nd Floor
6 Rajindra Place
New Delhi 110 008, INDIA
Tel +91 11 2572 7731
Fax +91 11 2572 7732
E-mail melssdel@vsnl.com
I don't know if whatever.....
DNA
Indian Catalog Thing
Gives a contact in New Delhi at the end....
205 Hemkundt House 2nd Floor
6 Rajindra Place
New Delhi 110 008, INDIA
Tel +91 11 2572 7731
Fax +91 11 2572 7732
E-mail melssdel@vsnl.com
I don't know if whatever.....
DNA
Hi Simon
which samples did u get from them?
i ordered the samples and Intersil guys said that the samples are not avialable.
Sagar
which samples did u get from them?
i ordered the samples and Intersil guys said that the samples are not avialable.
Sagar
the intersil samples are on the way and will take a week to reach here🙂
no reply is forthcoming from mmg.
Sagar
no reply is forthcoming from mmg.
Sagar
sagarverma said:
In a rare moment of stupidity I have gone and ordered 5 of the RM10 core kits (core sets plus bobbins plus clips) from RS. Four for one amplifier and one to break..
If you give me your full postal address then I will send them to you.
DNA
Cores
As DNA alredy said (At least I think) please use cores with an Air gap. You can take any core you like. The only important thing is that there is this gap! It makes the core linear, so you will get a good sound quality.
There are some practical things I would like to mention:
The resistors for the dead time should not bee 100k. The best thing is: Mount trimmer of 1M. Take the precise ones where you have to do 10 turns. You put them to 1M then you start the Amp and set up the dead time with an Osilloscope. By this way you can take (more or less) any MOSFET you like and you get optimal Performance.
The first time you start your amp: Please don't do that with 70V. They can be very painfull for you and for the Amp. I made a very bad experience with these 70V
Take some old Loudspeaker for your 1st tests. Since the output is DC coupled they burn very quickly if something goes wrong. or even better: take a resistor. I used solder wire (of course long enought to get 4 Ohm) and put it into water, so I was able to test the amp with high output power!
The Values for C41, R34, C21 do work, but if you want optimal performance you will have to do soem exact calculations. Btw. C21 is 1n on my board, but that shouldn't change very much, maybe I hadn't the right capacitor around.
The shutdown circuitry obviously works well, but sometimes I have the feeling it is too sensitive. You will see, maybe you will have to play a bit with it!
Simon
As DNA alredy said (At least I think) please use cores with an Air gap. You can take any core you like. The only important thing is that there is this gap! It makes the core linear, so you will get a good sound quality.
There are some practical things I would like to mention:
The resistors for the dead time should not bee 100k. The best thing is: Mount trimmer of 1M. Take the precise ones where you have to do 10 turns. You put them to 1M then you start the Amp and set up the dead time with an Osilloscope. By this way you can take (more or less) any MOSFET you like and you get optimal Performance.
The first time you start your amp: Please don't do that with 70V. They can be very painfull for you and for the Amp. I made a very bad experience with these 70V
Take some old Loudspeaker for your 1st tests. Since the output is DC coupled they burn very quickly if something goes wrong. or even better: take a resistor. I used solder wire (of course long enought to get 4 Ohm) and put it into water, so I was able to test the amp with high output power!
The Values for C41, R34, C21 do work, but if you want optimal performance you will have to do soem exact calculations. Btw. C21 is 1n on my board, but that shouldn't change very much, maybe I hadn't the right capacitor around.
The shutdown circuitry obviously works well, but sometimes I have the feeling it is too sensitive. You will see, maybe you will have to play a bit with it!
Simon
Thanks to both of u for being so helpful.
Hi Simon,
The testing that u are telling me is beyond my means.i dont have an oscilloscope with me(except the pc oscilloscope with 20khz max frequency).Moreover,these days my university is also closed bec of summer holidays so i can't go to my college for testing the amp.
I think u have fully tested and built the amp(very nice layout),so i will jus be assembling the parts on the pcb and test it with small PSU first and then hook it up on to the rewound SMPS in the car.
The component values that u think need to be alatered or be replaced alltogether by other suitable values....please list them🙂 It will also be of gr8 help if u can post the BOM of the amp + the pics of the amp.One more thing,i will use this amp for subwoofer,so will the quality loss be of significance to a sub if i use the core that i have?
Hello DNA,
Thanks for your help.please tell me the total cost.
Sagar
Hi Simon,
The testing that u are telling me is beyond my means.i dont have an oscilloscope with me(except the pc oscilloscope with 20khz max frequency).Moreover,these days my university is also closed bec of summer holidays so i can't go to my college for testing the amp.
I think u have fully tested and built the amp(very nice layout),so i will jus be assembling the parts on the pcb and test it with small PSU first and then hook it up on to the rewound SMPS in the car.
The component values that u think need to be alatered or be replaced alltogether by other suitable values....please list them🙂 It will also be of gr8 help if u can post the BOM of the amp + the pics of the amp.One more thing,i will use this amp for subwoofer,so will the quality loss be of significance to a sub if i use the core that i have?
Hello DNA,
Thanks for your help.please tell me the total cost.
Sagar
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