I have a circuit that I developed on breadboard. I have then soldered it on a PCB and it is now drawing more current on PCB compared to when it was on breadboard. I only want to discuss possible reasons for this without going into much detail about the circuit as I haven't changed it before or after soldering on PCB unless someone really wants me to.
Details about the circuit:
- Micro-controller based circuit.
- A couple sensors and a single radio.
- Step-up regulator for powering everything (Pololu 5V).
This is what comes to my mind:
- Flux conducting some current?
- Possible tiny short-circuit somewhere?
- Possible faulty chip after soldering?
- Possible different current consumption with different power supplier? (3.6V lipo battery over a cheap AC 1A 5V adapter)
- Possible larger resistance on breadboard circuit.
The circuit works fine so I assume there is no problem with PCB.
On breadboard it was drawing about 28.5mA. Now on PCB it's drawing about 40mA.