Question new PWM design

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Question new PWM design

Postby cableman » Mon Jul 17, 2006 7:00 am

Question for Steve...

I am going to try to get the complete PWM on 1 single-sided PCB.
But before i begin i like to know,why the +5V for the outputsection(500) is seperated from the 600 part
Did you design this because you have 2 boards,or electric separation?
What would be the current consumption of the 600 part?
It is going te be a hell of a job,but i think it possible.
I want to use printtransformers to reduse a lot of wiring

Greetings,

Bert
Netherlands
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Postby steve_qix » Mon Jul 17, 2006 9:04 am

You could use one supply. I used an independent regulator on the PWM output board for electrical separation and flexibility of implementation. The boards can all be used by themselves if desired.

Regards,

Steve
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Postby cableman » Mon Jul 17, 2006 9:30 am

Thank you Steve for your fast response. :D

I can start drawing now.
I'll post it here.
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Postby cableman » Mon Jul 17, 2006 3:13 pm

Looking at the schematic and text now for a few hours,but there is still one thing i don't understand.

What is the use of SW201??
I read it is a phase switch,but what is the purpose of it?

Someone??

Thanks
Bert
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Postby steve_qix » Tue Jul 18, 2006 12:25 am

cableman wrote:Looking at the schematic and text now for a few hours,but there is still one thing i don't understand.

What is the use of SW201??
I read it is a phase switch,but what is the purpose of it?

Someone??

Thanks
Bert


SW201 is indeed a phase reversal switch. This will reverse the phase of the audio signal that will ultimately modulate the transmitter. The purpose of the switch is to allow people with a) audio systems that don't have phase reversal capabilities, and, b) to allow folks using the mic preamp, to be able to operate the modulator using the most advantageous phase for maximum positive modulation.

Anyway, that's what the switch is for :-)

Regards,

Steve
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