[AMPS] Blow TL922

[measures]

>Hi Rich !
>
>HEATING VOLTAGE TL922
>
>>I'll do some of Rich's circuit improvements as the
>>next step. The heating Voltage measures 5.51
>>Volts ... a bit high.
>>
>€  A new world record!.    At such a fil V one would receive 4% of the
>normal emissive life. .
>
>
>Looks like this is so far off that I guess the swaped wires
>are not enoght to reduce the heating voltage. Do you have
>a guess what kind of R I need to get into a better area ?

You need to drop 5.5v - 4.8v = 0.7v.  The current is c. 15a.  R = 0.7/15 
= .047-ohms, so a pair of 0.0235-ohm resistors would be needed.  However, 
24ga. TFE insulated wire will carry 15a in free air, so you might not 
need to use actual resistors.  

>I don't want to play try on error and I am not quite confident
>how to calculate the two (?) R's .... .
>
>tnx for update, Helmut.  Congrats on new world record!
>
later,   Helmut

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