fireant007
Member
Hi spec,
Agreed,
This project is basically a small toaster.
Perhaps to cool this thing down I should try to duty cycle the anode voltage ?
edit: or use some kind of multiplexing to light the tubes one at a time ?
I have not had a chance to do much today as things have got in the way.
But I did manage to test at 100 to 115 VAC
At 100 VAC it just puts out 138 VDC (under small load)... so I might have to use the "spark me into life" circuit from Les as insurance.
edit: I am concerned that is does say max 250v in the data sheet .. but as there is hardly any currrent due to the 2.2M resistor it should be ok.
The case for this is going to be "difficult" ... you are right about the ventilation but I would prefer passive cooling if possible.
Oh... the transistor I am using at the moment is a BF469 (overkill).
Agreed,
This project is basically a small toaster.
Perhaps to cool this thing down I should try to duty cycle the anode voltage ?
edit: or use some kind of multiplexing to light the tubes one at a time ?
I have not had a chance to do much today as things have got in the way.
But I did manage to test at 100 to 115 VAC
At 100 VAC it just puts out 138 VDC (under small load)... so I might have to use the "spark me into life" circuit from Les as insurance.
edit: I am concerned that is does say max 250v in the data sheet .. but as there is hardly any currrent due to the 2.2M resistor it should be ok.
The case for this is going to be "difficult" ... you are right about the ventilation but I would prefer passive cooling if possible.
Oh... the transistor I am using at the moment is a BF469 (overkill).
Last edited: