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Old 25th June 2013, 12:47 AM   #131
lsheng is offline lsheng  United States
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I found myself reinvented the wheel again. This circuit is VERY good, I simulated one very similar to this one, I used TIP122 as output transistor because I do not need more than 5A output current. From 10Hz to 1MHz the output impedance is less that 50mOhm. Very impressive, better than any IC regulator I saw from their data sheet at 20KHz and above.

A few things different for my design, input capacitor could be larger, so input have less ripple. Not because the regultor can not handle, but the less ripple, less dropout voltage is needed. So you can use more voltage at the output. 1V ripple for every 1A current with 10000uF capacitor at input.

one capacitor(330uF) accross zenner diode you will have better Rejection, but more response time if input voltage is lower than output voltage for some reason(loss of regulation).

capacitor connected to 2.2k resistor need not to be larger than 330uF, 0.2Hz corner against 120Hz ripple. larger is certainly better, but I would use it on input rail.

Output capacitance can be large as needed, but not need to be large due to exceptional low output impedance, I would use it on input capacitor if input capacitor is less than 20000uF. I did not see big difference output capacitance changed from 10000uF to 100uF. Unless your wire have larger resistance, you still want to use one big capacitor close to your load. Or wire a sensing wire(the wire connected to output 2.2k resistor) seperately to your load to be more efficient.

Last edited by lsheng; 25th June 2013 at 01:14 AM.
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Old 25th June 2013, 10:32 AM   #132
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by lsheng View Post
.......... I simulated one very similar to this one, I used TIP122 as output transistor because I do not need more than 5A output current...........
are you running 15 or 16 ohms speaker in your simulator?
Or did you use a resistor as your simulated load?
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Old 25th June 2013, 05:04 PM   #133
lsheng is offline lsheng  United States
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Now I am just using current source as load to test its output impedance and transient response.

Quote:
Originally Posted by AndrewT View Post
are you running 15 or 16 ohms speaker in your simulator?
Or did you use a resistor as your simulated load?
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Old 25th June 2013, 10:39 PM   #134
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Default Isheng..... thank you as you like it.

In your home version use the modifications you suggest.

regards,

Carlos
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Old 5th July 2013, 06:38 AM   #135
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Default In this video i have tested the supply using Brazilian pcboards

Juan will make a copy...his style...modified to his own taste, to supply the international comunitty.

Tell him you want...this way he gonna be motivated to move.

The first test (portuguese language) failed in the negative rail...voltage drop was too much high...this happened because i have not soldered one side of the coil, so...3.3 ohms of series resistance created the voltage drop ou could see.... then i fix the mistake and the supply worked great.

This is one of a big series of videos "building the Dx Super A and Dx Supply"....all them in portuguese because we had a lot of guys that ordered pcboards from Zimmer and i have to offer them a follow up in order to make their life easier.

regards,

Carlos

Dx Super A - Brasil - começando a montar, parte 1 - YouTube
Dx Super A - Brasil - continuando a montar, parte 2 - YouTube
Dx Super A - Brasil - continuando a montar, parte 3 - YouTube
Dx Super A - Brasil - continuando a montar, parte 4 - YouTube
Dx Super A resistividade do amplificador, teste da fonte Dx - YouTube

If you cannot understand the language, at least you understand electronics and you can watch images (this talks too... and a lot!)
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Old 7th July 2013, 11:47 PM   #136
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Default Juan will produce a nice layout to the international comunitty

Coqui Dx Regulator part 1 - YouTube

This is good...he is working on that.

The last one he made was not approved by him.

regards,

Carlos
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Old 1st August 2013, 08:28 PM   #137
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Default Juan Vargas is now drilling his supply pcboard

Here you have it:

Drilling time ! - YouTube

regards,

Carlos
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Old 1st August 2013, 11:42 PM   #138
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Default Juan's pcboard to Dx Supply is having a good advance

You can see it here:

Dx Regulator copper uncover - YouTube

regards,

Carlos
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Old 25th August 2013, 11:04 PM   #139
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Default Juan is finishing his test with his international version Dx Supply pcboard

in a couple of weeks he will be ready to move on.

Also we have discovered a way to ship (in a safe way) from Brasil to outside our country.

So, you can order from Zimmer too...he is the one provide pcboards from Brasil.

Zimmer is authorized to provide..... i cannot do that.

imap.eletro@gmail.com

regards,

Carlos
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Old 26th August 2013, 11:29 AM   #140
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Default Zimmer is ordering a big batch to Brasil and also to the International comunitty

We have discovered a kind of registration that make the shipment safe.

Kit including power supply pcboard and 2 amplifier pcboards (Dx Super a) will cost around 45 bucks or more ( i am not sure... ask Zimmer)

In Brazil we use to ask for discount...ahahahahah!

regards,

Carlos
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