Headlight modulator circuit for motorcycle

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Adjustable capacitor Murata genuine original

TZC3Z030A110R00 MURATA Murata adjustable capacitor original spot

Photocoupler

The brightness of the general vehicle headlights does not change. If you change the brightness alternately, it will not only attract the attention of passers-by, but also save power.
The picture on the left is the headlight circuit that is off when it is on. IC (555) and R1, R2, Cl, and C2 form an astable multivibrator. The oscillation period T=0.693 (Rl+2R.2) (Cl+C2).
Its lamp light time t charge = 0.693 (R1 + R2) (Cl + C2), the lamp off time t put = 0.0693R2 (Cl + C2), because Rl "R2, so t charge ≈ t put, that is, the duty cycle is 50 %. VT1 and VT2 are power boost stages. The oscillation frequency of the 诙 oscillator is about 4 Hz. The picture on the right shows the control scheme using the relay.