7i76E to VFD

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9 years 4 months ago #94831 by andypugh
Replied by andypugh on topic 7i76E to VFD

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Here is a diagram. I think it ought to work.

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9 years 4 months ago #94832 by tecno
Replied by tecno on topic 7i76E to VFD
Thanks, will make a PCB layout or just make one on a lab-pcb.

Cheers
Bengt

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9 years 4 months ago #94835 by andypugh
Replied by andypugh on topic 7i76E to VFD
How different in layout is the existing PCB? Perhaps you can just jumper / cut some tracks?

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9 years 4 months ago #94836 by tecno
Replied by tecno on topic 7i76E to VFD
Have to get the board up and have a look, probably easy modification to do.

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9 years 4 months ago #94844 by tecno
Replied by tecno on topic 7i76E to VFD

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Fairly easy modification, above is how the board is now.

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9 years 4 months ago #94847 by andypugh
Replied by andypugh on topic 7i76E to VFD
I showed the relay coils high-side switched, but low-side switched like you have will work fine, so that bit can stay the same. (you need to switch polarity of the Mesa output, is all)

A bit of cutting and jumpering looks necessary on the relay contacts.

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9 years 4 months ago #94848 by tecno
Replied by tecno on topic 7i76E to VFD

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I was going to do like this, should be OK?

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9 years 4 months ago #94849 by andypugh
Replied by andypugh on topic 7i76E to VFD

tecno wrote: I was going to do like this, should be OK?


Should be, if the relays work reliably at 10V.

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9 years 4 months ago #94850 by tecno
Replied by tecno on topic 7i76E to VFD
Will do a test again, if I recall it right they did.

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9 years 4 months ago #94852 by tecno
Replied by tecno on topic 7i76E to VFD
No problems at 10V so I hope 10E output is somewhat near that, but they work on the bench at about 8V.

Also well within 10E permissible load of 10mA on the VFD

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