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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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Ramping Lamp Driver
designed by David A. Johnson, P.E.

This circuit drives any 12v lamp, incandescent or LED type, in a ramping fashion.  Each press of the button toggles the lamp from a fully off mode to a fully on mode.  But, instead of an instantaneous lamp intensity change, the power is slowly ramped up and down. 
With the components shown, the ramping action takes two seconds to complete.  By changing the capacitor C3, you can increase or decrease the ramping time.  The circuit will also operate with supply voltages ranging from 15v to 3v.

Click on Circuit Below to view PDF of Schematic

up and down ramping lamp driver by dave johnson

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