thanks itsmoked for your reply.
your clarification doesn't answer my question why can't one transformer power example 2 of these "internally grounded" control cards, or does it? i am lost on this. sorry for that and if you can explain this to me it'll b good. thanks in advance.
many thanks dave for the diagram. and rbulsara for the link and itsmoked for the explanation.
i've gotto go thru the diagram and info and make sense out of it.
from the diagram dave provided, i would think during -ve half cycle the power supply is shorted with the internal circuitry (hidden...
perhaps break it into few portions. like -
1. since the control card A i assume from the specs is INTERNALLY rectifying the 24VAC to ? DC via a full wave rectifier and say we supply 24 VAC via a transformer
secondary, why is grounding of the transformer a problem?
2. why does a DEDICATED...
still totally lost scott but thanks for your help. would appreciate simpler explanation for a dimwit like me. any way of doing this explanation simpler?
hi,
found this requirement on power for a repeater card.
"24 VAC @ 5 VA. Utilizes a full-wave rectifier (do not ground secondary), and requires
power from a dedicated transformer"
want to understand basic of why utilising a full wave rectifier means no grounding of secondary and a dedicated...
