555 Power LED PWM Reg
Regulate Power LEDS thru 555 in PWM Mode
A simple astable multivibrator, based on xx555, with a large duty-cycle variation, control a PowerMosfet Driver and feedback on 555-CV pin. Calculate RS on your POWER LED, RS=0.6/Iled. D1 and D2 must be lower voltage drop as schottky or germanium diodes.