Light Bulb Limiter Schematic. I am formerly an electronics technician where i used one of these on a daily basis to help troubleshoot electronic circuits. R1 35 0 7 30 2 5 410 ohms wattage for the above resistor would be p v2 r 35 x 35 410 2 98 or 3 watts.
And attach a light bulb 60 100 watts across the fuse holders. Remove power tubes one at a time. This project is to make a light bulb current limiter used to test electronic devices powered by line voltage.
I have received a few questions on the operation of series bulb current limiter and in this lesson i wish to shed some light on this very old gadget and yet a favorites for both engineers and technicians around the world.
Here s the schematic of my light bulb limiter. I am formerly an electronics technician where i used one of these on a daily basis to help troubleshoot electronic circuits. R1 us 0 7 hfe load current where us supply voltage hfe t1 forward current gain load current led current 100w 35v 2 5 amps. Here s the schematic of my light bulb limiter.
