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Universal 3-wire Flasher Unit Schematic Circuit Diagram

Challenges with Conventional Scooter Flashers

Traditional scooter flasher unit present two significant shortcomings that need to be addressed. Firstly, these flasher unit necessitate a relatively high operating current to trigger their switching mechanism. Consequently, they are incapable of functioning effectively in ‘LED’ mode, which typically operates at power levels below 5 W. Secondly, these units often lack an audible warning mechanism, leaving riders without a clear indicator if they forget to deactivate the turn signal. Given that scooter indicators do not have a self-canceling feature, many riders tend to forget to switch them off manually. These issues call for an innovative solution to enhance scooter safety and functionality.

Universal 3-wire Flasher Unit Schematic Circuit Diagram

Innovative Solution for Scooter Indicator Problem

Finding an effective solution to the annoyance caused by the incessant beep-beep of scooter indicators in town environments has been the driving force behind this project. Typically operating within a range of 1-40 W loads, this innovative system aims to address this issue effectively and elegantly.

Circuit Components and Functions

Incorporating diodes and a sounder, the circuit features essential elements to ensure smooth operation. D1 safeguards the circuit from reversed polarity, efficiently handling currents of up to 6 A. A current detector comprising R1, T3, and IC1, functioning as a comparator, enables precise switching based on the current flowing through R1 and P1’s adjustment.

Monostable Operation and Reset Mechanism

IC2.A and IC2.B are configured as a monostable circuit, with IC1’s output triggering R4’s charging of C3. Subsequently, IC2.B goes high, turning off T3. Following this sequence, IC1 switches, IC2.B follows suit with a slight delay, and T3 is reactivated. D2, D3, R5, R6, and T1 are structured as a NOR gate facilitating the counter’s reset without needing ignition deactivation. Resetting the counter occurs when both pins 1 and 4 of IC2 are simultaneously low.

Timing and Sounder Operation

The counter, IC3, specifically a CD4060, is configured so that its output Q6 goes high every 64 pulses on pin 11. R4/C3 network ensures switching approximately every second. After about a minute, IC3’s output Q6 triggers the sounder via IC2.C, IC2.D, and T2, synchronizing it with the indicator. For comprehensive details, the downloadable resources include the author’s PCB design and project images. The board’s dimensions are tailored to fit a standard 32 mm PVC tube, ensuring compatibility with most scooters. During installation, careful attention should be paid to the tracks carrying high currents, although the MOSFET does not require a heatsink. Securing the PCB inside the tube involves using hot-melt glue, ensuring P1 remains unobstructed.

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