Increase electric bike speedDesigned by qqqlab in Switzerland
When placed between the speed sensor and the motor, this device receives the impulses from the speed sensor and only sends every second impulse to the motor. The motor thinks the bike is going half...Read More…
When placed between the speed sensor and the motor, this device receives the impulses from the speed sensor and only sends every second impulse to the motor. The motor thinks the bike is going half speed, and the speed limiter kicks in at 50 km/h instead of 25 km/h.
I've used it for over a year now, and don't want to go back.
It works with most bikes that have the motor driving the crank, it does not work with in-wheel motors. I'm using it with a Bosch motor.
This product can be dangerous if used irresponsibly. Higher speeds mean higher stresses on your bike. Make sure your brakes, front fork, and other safety-related parts can handle it. Use at your own risk.
Only use on private grounds!!! Biking with this device on public roads is not allowed in most countries. When you configure it as a dongle, the device can be completely removed, and the bike can be used on public roads again.
Turn the device into a removable dongle with a switched 3.5mm stereo jack and plug, see drawing.
The speed sensor is a simple reed switch. The switch SW1 closes when the magnet on the wheel passes it. On the motor side the switch is powered by pull-up resistor R1, and the motor receives a low signal when the switch closes.
The device mimics the same configuration with SW2 and R2. It senses the closure of SW1 and closes SW2 for every second closure.
The device is powered by the motor via R1, and uses diode D and capacitor C to keep it powered while SW2 is closed.
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