I am currently trying to design a basic time delay circuit. The circuit's goal is to switch on a BLE beacon (requires 1.8V-3.6V at 1mA) for 3-5 seconds and then switch it off again. My first option was to use a 555 timer, however, due to the fact that the circuit is battery powered (coin cell CR2032) I require something which uses the least amount of power. I thus opted for an n-channel mosfet with a low-side transistor configuration.
- Is this the best, most efficient manner in which I could build a delay circuit?
- If not, what is and why is it more efficient?