Motorcycle flash light circuit

People all want motorcycles to have a turn flasher. It is economical and convenient
to install a turn flasher yourself .
The figure shows its principle circuit.
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 VT2 is 3;50-loo. The power supply can use four AA
batteries connected in series. RP is a potentiometer, adjusting it can change
the flash frequency. K can use JRX-4 type relay or make your own.