Posted: Fri Oct 05, 2012 5:22 pm
Hi Harry,
I'm attaching a clearer pdf version of the circuit.
The tube heater reg is set to +7.6v with a safety dropper 18R to produce around 5.8v across the heaters, so the tube heater is nominal 6.3v.
The reason I chose this arangement was I'd just burnt out a heater on a 1inch vidicon and I wanted to limit the inrush current.
I could have configured the voltage reg to be constant current but I felt this was safer limiting inrush br resistor.
(Not sure if the forum will accept a pdf)
Regards,
Graham
I'm attaching a clearer pdf version of the circuit.
The tube heater reg is set to +7.6v with a safety dropper 18R to produce around 5.8v across the heaters, so the tube heater is nominal 6.3v.
The reason I chose this arangement was I'd just burnt out a heater on a 1inch vidicon and I wanted to limit the inrush current.
I could have configured the voltage reg to be constant current but I felt this was safer limiting inrush br resistor.
(Not sure if the forum will accept a pdf)
Regards,
Graham