I have made and tested chip amp from 3886 by National Semi, and tested it with 20V-0-20V 100Va transformer.
Actually now i got a transformer rated @35V-0-35V rail, but after bridge i get 50V DC rails.
How can i use a regulator for getting 35v. I dont wanna go in for linear regulator design as it will have quite high losses & heat dissipation.
I need a schematic design of SMPS, using 3525/3524 and mosfets, to get regulated +-35V 4-5Amps
Actually now i got a transformer rated @35V-0-35V rail, but after bridge i get 50V DC rails.
How can i use a regulator for getting 35v. I dont wanna go in for linear regulator design as it will have quite high losses & heat dissipation.
I need a schematic design of SMPS, using 3525/3524 and mosfets, to get regulated +-35V 4-5Amps
janneman said:
You are certainly right. I am probably exaggerating in my heat concern on electronic parts.
Some say a bit of temperature is good for the sound.
Bottom line: it's important to see if the heatsink metal close to the part is about the same temperature as the part itself, to see if the heat transfer is being properly done.
Carlos
Linear regulators are very inefficient, and would heat more that the amplifer itself
SO...............
Here's my plan fo regulated high current & voltage regulator
using PWM Chip and using IR2110 + Nchannel Mosfets for Pos & neg voltage regulation.
I need to know exact operation and connections using the IR2110.
Would try to scetch it on a paper first.
SO...............
Here's my plan fo regulated high current & voltage regulator
using PWM Chip and using IR2110 + Nchannel Mosfets for Pos & neg voltage regulation.
I need to know exact operation and connections using the IR2110.
Would try to scetch it on a paper first.
crissty said:
I have to join P-A to warn you. if you cannot even get the basic connections yourself, chances of succes are no more than -60dB. Not to discourage you, just to make sure you know what you are getting yourself into.
There is MUCH more in the successful development of a SMPS than is shown in the schematioc.
Jan Didden
Jan Didden,
I hope you also had a time when you learnt about what is MOSFET DRIVER.
Now is the time for me to learn this.
But one has to learn something sometime, might be it would take some time to get over it, especially if people like you all would support and help, new ideas would be fullfilled.
Do you think the idea i have thought is wrong, and is not possible.
I hope you also had a time when you learnt about what is MOSFET DRIVER.
Now is the time for me to learn this.
But one has to learn something sometime, might be it would take some time to get over it, especially if people like you all would support and help, new ideas would be fullfilled.
Do you think the idea i have thought is wrong, and is not possible.
peranders,
Its all about Improvements, so keep on improving
That is what we can do here, with each others ideas & experiences.
Some good circuit design for motor controller would serve as a regulator, with some additional circuit (like error correction etc...)
Correct me if I am wrong.
Any comments.......
crissty said:
No, your idea is a good one. And I really respect you for having the motivation and guts to attack such a project. If you bring it to a successful end, you will have learned immensely and you'll feel pretty good
. It's the only way to learn, but I just wanted you to realise what you are getting into. Jan Didden
If you have 50 VDC and want to take it down to 35-40 volts, it may be done. I'll guess you have to poke around at Maxim or Linear Tech to find some suitable IC but when you are ready and have two good working switching regulators including necessary filters, I'll suspect that it would have been easier and cheaper to change the transformer to 2 x 24 V or 2 x 28 VAC.
As P-A said, research the switch mode controller offerings of the common vendors - National Semi and Linear Tech. Nat Semi, has on their site, a feature where you plug in your desired Vin, Vout, Iout and it recommends some devices for you.
The downside is that there's no negative switcher. You could do what the LT1085 fanatics do and use floating grounds with two positive switchers.
Since you have the willingness to experiment, please do so. It's fun to learn about output switching artifacts, output filter design, poor output impedance over freq, etc and how they affect audio quality.
Alternatively, you could try the easy way out. Use off-the-shelf 48Vin brick type switchers. They are cheap, compact, well documented and tweakable to get your desired Vout. Oh, they're fully protected and probably perform better than any home brew switcher.
Yet another option is to go hybrid between the two approaches. Use linear regulators but with a switching tracking pre-regulator. You get high efficiency (but not as great as a pure switcher) and low noise. Now that'll be fun.
The downside is that there's no negative switcher. You could do what the LT1085 fanatics do and use floating grounds with two positive switchers.
Since you have the willingness to experiment, please do so. It's fun to learn about output switching artifacts, output filter design, poor output impedance over freq, etc and how they affect audio quality.
Alternatively, you could try the easy way out. Use off-the-shelf 48Vin brick type switchers. They are cheap, compact, well documented and tweakable to get your desired Vout. Oh, they're fully protected and probably perform better than any home brew switcher.
Yet another option is to go hybrid between the two approaches. Use linear regulators but with a switching tracking pre-regulator. You get high efficiency (but not as great as a pure switcher) and low noise. Now that'll be fun.
but why do u want a regulated supply?
gainclones are usaully best suited with unregualted snubberised psu's.
and second thing if ur using lm3886 isnt 100va toooooooo low.
i mean your bass will be cut down.
and i wouldnt suggest using +/- 35v. use 25-30v so that the amp is flexible to different speaker loads.
if sometime u want to use a 6ohm speaker the amp will get all sweaty.
are u building a mono amp? for wat aplication are u using it?
gainclones are usaully best suited with unregualted snubberised psu's.
and second thing if ur using lm3886 isnt 100va toooooooo low.
i mean your bass will be cut down.
and i wouldnt suggest using +/- 35v. use 25-30v so that the amp is flexible to different speaker loads.
if sometime u want to use a 6ohm speaker the amp will get all sweaty.
are u building a mono amp? for wat aplication are u using it?
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.