Hello guys,
So I'm currently working on a fingerprint-security system on a motorcycle. The security system is perfectly working. But my problem is the power source. In order to power-up my system properly, i need to supply it with another battery source because if i use the motorcycle's battery my security system would reset when starting up the motorcycle. My mentors really challenges me to device a powersupply circuit that would only use the motorcycle's battery and would not reset my system during ignition..

I'm hoping for suggestions for a power supply circuit that would conquer this problem..

Thanks!! God Bless

 

Feed from a diode into appropriate capacitor?
Without another battery, what is there?
A flywheel?

ps.
What's with the title?

 

What input is required by your security system?

 

Tap into the ignition power, since that voltage isn't interrupted when starting. Then add a series diode feeding a large capacitor to maintain the system voltage due to the battery voltage drop from the starter current.