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RE: Is this feasible? Rectifying 6.3v for heaters




Hi Pete,

Above is the OEM power supply of the Citation 4. Note that the junction of V1 and V4 is grounded. After adding my heater ballance circuit I did likewise to the other heater pairs so now all the heaters have virtually the same voltage.

By the way the rectifier feeding the Vcontrol pin is also a full wave bridge. The bottom two diodes are shared with the full wave bridge feeding the input of the regulator. The peak voltage at each pin is very near identical however the ripple at the Vcontrol is very low as the current is simply the overhead of the chip which is mainly the base drive of the pass transistor at the output. At the bottom of the ripple at the IN pin the Voltage at the control pin is still high enough to keep the chip active.

I will scan the heater ballance circuit and will post it as well.

Phil

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