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Old 11th November 2011, 07:27 PM   #401
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OK!
I have now installed the Salas reg and it is working through a dummy load being run from a newly installed 25V, 1A encapsulated toroid. I had to re-arrange the power amp internals to get everything in. So far so good but I'm still waiting for the BA-3 mosfets to arrive. I gave up on the separate modules idea because I don't have the space and I did want to keep signal paths as short as possible.
Will I need to run the voltage reg ground to the star ground of the power board power supply?
Im pretty sure the answer will be yes but I would appreciate your comments.
Chris

Last edited by Backbones; 11th November 2011 at 07:29 PM.
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Old 12th November 2011, 01:55 AM   #402
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Backbones View Post
Will I need to run the voltage reg ground to the star ground of the power board power supply?
Im pretty sure the answer will be yes but I would appreciate your comments.
Chris

power star ground is your speaker, right ?

so I would think your regulated frontend ground connects to chassis
through own thermistor

have to say, I'm not really sure about it

Salas reg sounds interesting
I could 'steal' the reg/supply section from a couple of boards I have from symmetric B1 project GB
have thought about it, but I don't know if its suited fore this voltage
remember someone having pretty hot mosfets
and my trafo is 2x22Vac
maybe good heatsinks will do the trick
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Old 12th November 2011, 03:08 AM   #403
rsdio is offline rsdio  United States
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Quote:
Originally Posted by tinitus View Post
power star ground is your speaker, right ?
I don't think so. Power star ground should originate with the supply.

Quote:
so I would think your regulated frontend ground connects to chassis
through own thermistor

have to say, I'm not really sure about it
You should never make the chassis a conductor in terms of star ground connections. The chassis should be entirely optional in terms of the circuit. In fact, the biggest reason to ground the chassis is for safety, so that any dangerous voltage errors will short to the chassis and trip a circuit breaker rather than stop your heart. In that sense, chassis ground should be independent of power star ground, and thus should connect to the third wire on your power input cable - the green wire known as safety ground.

An important secondary function of the chassis is to serve as a Faraday shield for your electronics, but don't let that important function tempt you into violating safety grounding standards. The chassis should still serve as a perfectly functional shield even if it isn't part of the power star ground at all. In fact, I believe you could put 48V DC on the chassis and it would be just as effective as a Faraday shield as any other voltage such as "0V" (keep in mind that there really is no such thing as 0V, because each house on your street has a different ground potential depending upon the amount of current flowing in your neighborhood to each home from the power grid source).
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Old 12th November 2011, 08:42 AM   #404
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by rsdio View Post
I don't think so. Power star ground should originate with the supply
No.
The PSU Zero Volts should connect to the Main Audio Ground (MAG) via ONE connection. This is usually a wire to carry the power ground currents back to the capacitors.
One does not want the charging circuit currents entering the Power Ground and certainly NEVER on the MAG
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Old 12th November 2011, 09:31 AM   #405
rsdio is offline rsdio  United States
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Quote:
Originally Posted by AndrewT View Post
The PSU Zero Volts should connect to the Main Audio Ground (MAG) via ONE connection. This is usually a wire to carry the power ground currents back to the capacitors.
One does not want the charging circuit currents entering the Power Ground and certainly NEVER on the MAG
Ah, so it seems that the output of the PSU should connect to a star ground where everything else connects from there. The PSU input ground should not connect to this star ground except indirectly through the PSU itself.

It also seems that the "speaker" is not the star ground, unless I'm still missing something.

Any comments on the chassis? ... particularly with regard to star ground and safety ground, etc.
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Old 12th November 2011, 09:48 AM   #406
Zen Mod is offline Zen Mod  Serbia
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you have plenty of highres pics of FW amps on 6moons site

also - you have plenty of pdf files on FW site , almost all of them having schm of common FW PSU , which is extremely well and informative , regarding physical layout .

connecting these pictures with these schematics - in your brain - will give you much more benefits than simply reading answers on your questions

all questions and answers are just parts of broader picture

off course , except in case when answer is 42

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Last edited by Zen Mod; 12th November 2011 at 09:51 AM.
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Old 12th November 2011, 09:50 AM   #407
AndrewT is offline AndrewT  Scotland
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The speaker black terminal could be adopted as the Main Audio Ground.
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Old 12th November 2011, 09:54 AM   #408
Zen Mod is offline Zen Mod  Serbia
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one of few churches in my town should be adopted as Main Ground
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Old 12th November 2011, 02:58 PM   #409
tinitus is offline tinitus  Europe
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http://www.firstwatt.com/pdf/prod_f5_man.pdf

in F5 manual you will see that star ground is 'seperated' from chassis by resistor/thermistor (last image in manual)
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Old 12th November 2011, 03:02 PM   #410
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My scheduled BA modular setup.
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