Hello, I'm trying to do my due diligence of read thru the posts. however here it goes another question.
why the cap "2200uF/6.3V" needs to have the exact voltage rating ?
Thanks
why the cap "2200uF/6.3V" needs to have the exact voltage rating ?
Thanks
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6.3V is one of the standard voltage ratings.
You can use a higher voltage rating, but not a lower rating.
As you increase the rating the volume of the capacitor becomes bigger.
Your PCB may have limited space for the capacitor.
You choose a voltage rating that fits the PCB and meets the minimum requirement.
You can use a higher voltage rating, but not a lower rating.
As you increase the rating the volume of the capacitor becomes bigger.
Your PCB may have limited space for the capacitor.
You choose a voltage rating that fits the PCB and meets the minimum requirement.
I have tried, and I believe that they have internal protection Zener diode.
http://www.profusionplc.com/pro/gex/pcatdtl0.html
Exicon Lateral MOSFETS - Our Product Range
It is said: "Integral protection diode"
Some more information: Only In Exicon mosfets with "Z" sufix it is said:
"WARNING: These lateral mosfets do not include a G-S protection network and
care must therefore be taken with static handling precautions and the
appropriate protection in the ampli er circuit."
www.exicon.info/PDFs/ecw20n20-z.pdf
"WARNING: These lateral mosfets do not include a G-S protection network and
care must therefore be taken with static handling precautions and the
appropriate protection in the ampli er circuit."
www.exicon.info/PDFs/ecw20n20-z.pdf
i ordered this ones : ECX10N20-S,
and they have some sort of matching.
thanks for your info
I did not see the datasheets of ECX10N20/10P20 mentioning the gate-protection diodes. How can we be sure that these devices have it? That said, the Vgs seems clamped to +/-14V which indicates possible addition of the diodes.
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ECW does not mention Gate protection diodes.
The others are covered by the statement that they have "integral protection diode"
The others are covered by the statement that they have "integral protection diode"
Dear brunogiovs, thank You for clarification!
Dear Shaan, now we can be sure, that standard part (without "suffix") has these diodes.
When I handle any MOSFET, I first use lead clips to short it out then I put shorting wire around it connecting all the leads together for soldering, then I remove it before I apply voltage.
Hello Guys , I'm still waiting from my PCBs and my LatMosfets to arrive.
I've been spending some time staring to the V3 schematic.
so I have a question why the peeceebee needs the drivers, how it would behave without then. like have the bc5xxs driving the latmosfets directly?
Thanks
I've been spending some time staring to the V3 schematic.
so I have a question why the peeceebee needs the drivers, how it would behave without then. like have the bc5xxs driving the latmosfets directly?
Thanks
It's the VAS (Voltage Amplification Stage). PeeCeeBee doesn't have a driver stage.
This is an amplifier with complementary BJTs at input that put-out current from their Collectors as signal for the next stage. But the MOSFETs are in source-follower configuration and accepts only voltage at their Gates as signal. Also the two nodes have different reference voltages.
So you can see that these two stages of the circuit are incompatible and need some form of "current to voltage converter" in-between. Here comes the VAS which does exactly that. Input and output nodes can now talk to each other and we have a nice Class-AB amplifier.
P.S.- To drive the MOSFETs directly from the BJTs you need to remove them from the output and replace the VAS transistors with them (with a few other modifications to the circuit) and afterwards increase MOSFET bias to 2A so that THD remains acceptably low. (very not-recommended 🙂)
In class A operation (with class AB at higher power since push-pull) with about 1A of bias you can get a decent 20w/ 8 ohms amplifier...
Amplificateur USSA 15W - Conception - Page 3
Fab