SARA-2016

[greierasul]

I am not talking about Mackie. It's none of my business what makes Mackie. I'm talking about that technical solution. 🙂

 

[odiosu]

I gave the scheme as an idea.
I haven't made the stabilizer yet.
it's perfect with a diode on the GND.
I want to get the 70v by summing the 55 with a voltage of about 20 from a separate winding.
my problem is after the stabilizer
thank you for help

 

[dreamth]

It's not even probably needed to have a higher voltage supply for the driver in your amplifier as you're not hunting for the last available watt, but if he does it the sag can be taken into account and substracted dinamically from the drive supply voltage if the psrr is good enough , yet I know it's a tricky thing with split supplies .
If I take your solution into account...to which ground should I connect that zenner so that I won't have any problem with common mode noise?
Here's a fairly uncommon solution, but it's done like that because it has a purpose:

 

[greierasul]

There is not a voltage regulator, there is a capacitance multiplier.

 

[odiosu]

stabilizer. I will put two 33v diodes in a row

 

[dreamth]

There is not a voltage regulator, there is a capacitance multiplier.

So what? It has a refferenced base to a ground , same as a regulator has.No regulator is better than its refference.

 

[greierasul]

So what? It has a refferenced base to a ground , same as a regulator has.No regulator is better than its refference.

No, there is not any voltage refference to ground. There are capacitors, C7 and C8, 10uF at 100v. 🙂

 

[dreamth]

I can't write you in romanian here...In AC the transistor's base is refferenced to ground through capacitors.Whether it's a zenner or a capacitor they are transparent to AC thus the base will ride whatever noise is found in GND respective to the supply lines, the ground being the refference.

 

[greierasul]

We do not talk about AC, we talk about DC. I do not care about AC, we want a pure and fixed DC, 65v. In your example we have an a capacitance multiplier wich is a different kettle of fish. The capacitance multiplier tracks the input voltage , there is not a voltage regulator like a zener voltage regulator. The capacitance multiplier just remove the ripple and some noise, you may say it is like a low-pass filter. It does not regulate the output voltage.

 

[odiosu]

https://www.komitart.ru/499-sara-2016-amplifier-project.html

 

[alexya]

Hello, I am building on the second SARA 2016 RAIMOND amplifier, I have a small problem with the source, I don't know how to do it, I would like to make the source with 2 Mundorf MLytic HC 47,000 uF 80V Power Cap capacitors, two 35A rectifier bridges, softstart , 800VA / 40VAC-40VAC transformer, what do you say is good?

 

[ingo50]

Hi greierasul,
What is the minimal suply voltage for this amp.
I got someone toroids 2*30 V~ @300 VA, giving
ca. 41v dc. +- . Do I Need to change any Rs or
zeners? Yes the Power will be lower but with a
„hard“ powersuply I will have not less than 125 watt@ 4 ohm
All the best. Ingo

 

[dreamth]

It will perform better on 2 ohms and slightly worse on 8 ohms...

 

[greierasul]

Hello, I am building on the second SARA 2016 RAIMOND amplifier, I have a small problem with the source, I don't know how to do it, I would like to make the source with 2 Mundorf MLytic HC 47,000 uF 80V Power Cap capacitors, two 35A rectifier bridges, softstart , 800VA / 40VAC-40VAC transformer, what do you say is good?

An excellent choice ! One remark please : twist the conductors between them from the transformer to rectifier bridges and from the bridges to capacitors. This way you will avoid magnetic loops.

 

[greierasul]

Hi greierasul,
What is the minimal suply voltage for this amp.
I got someone toroids 2*30 V~ @300 VA, giving
ca. 41v dc. +- . Do I Need to change any Rs or
zeners? Yes the Power will be lower but with a
„hard“ powersuply I will have not less than 125 watt@ 4 ohm
All the best. Ingo

For 41v 0v -41v, you must change R63 and R6 from 4k7 ohm to 3k3 ohm. The rest remain the same.

 

[greierasul]

Hello, I am building on the second SARA 2016 RAIMOND amplifier, I have a small problem with the source, I don't know how to do it, I would like to make the source with 2 Mundorf MLytic HC 47,000 uF 80V Power Cap capacitors, two 35A rectifier bridges, softstart , 800VA / 40VAC-40VAC transformer, what do you say is good?

You may take the ground between capacitors.

 

[ingo50]

Thank You , greierasul
Ingo

 

[alexya]

You may take the ground between capacitors.

Thank you

 

[alexya]

Disassembly of the housing and drilling and threading in the radiators is ready, there is still work to be done on this amplifier, is the thermal conductor between the two radiators enough?

 

[greierasul]

Each module is one channel, right ?