Motorcycle flash light circuit

People all want motorcycles to have a turn flasher. If you install a turn flasher yourself, it is both economical and convenient.
The picture shows its circuit diagram. The circuit structure is simple, the materials are easy to obtain, the flash frequency is stable and reliable, and the turning flash light is also suitable for
bicycles and electric vehicles.
    The value of transistor VT1 is 30-40. If it is too large, it is easy to stop oscillation. The value of vrz is ~50-100. The power supply can use four AA batteries connected in series. Adjust
the RP potentiometer to change the flash frequency. The small relay K can be of type JRX-4, or it can be homemade.