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Re: Resistive load - 100 watt lamp.pdf

I developed this subcircuit when modeling some aircraft lamp drivers....

**** ** AIRCRAFT LAMP SUBCIRCUIT *VO=NOMINAL OPERATING VOLTAGE *IO=NOMINAL STEADY STATE OPERATING CURRENT *RCOLD=FILAMEMT RESISTANCE MEASURED AT ROOM TEMP (300K) *TAU=CURRENT TIME CONSTANT AFTER A 0 (zero) TO VO STEP IS APPLIED .SUBCKT LAMP 1 2 PARAMS: VO=28 IO=25m RCOLD=112 TAU=22m TAMB=300 H1 6 0 VML 1 RH1 6 0 1 GP 0 4 VALUE={V(6)*V(1,2)} *V(4,0) = FILAMENT TEMPERATURE IN KELVINS RT 4 5 {300*(VO-IO*RCOLD)/(IO*IO*VO*RCOLD)} CT 4 5 {TAU*IO*IO*VO*RCOLD/(300*(VO-IO*RCOLD))} VAMB 5 0 {TAMB} El 7 0 1 2 300 R1 7 0 1 E2 8 0 VALUE={V(4)*RCOLD} R2 8 0 1 E3 10 0 7 9 10MEG R3 10 0 1 E4 9 0 VALUE={V(8)*V(10)} R4 9 0 1 GR 1 3 10 2 1 VML 3 2 0 .ENDS LAMP **** ...Jim Thompson 
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| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
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Prior to the LED days, Motorola once made radio dispatch consoles that used incandescent lamps for PTT and channel activity call light. These lamps were 24 VDC and turned on and off thousands of times. There was a small resistor across the open collector driver to keep the lamps slightly lit to prevent dmage to the lamp and the transistor driver.

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Joe Leikhim K4SAT
"The RFI-EMI-GUY"©
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My first round design of the T-Bird sequential turn signals (replacement for the motor/cam thingy) did that, then I went to a chip driving SCR's... interruption the conventional bi-metal way. ...Jim Thompson

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| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
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Jim Thompson

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