SR22 pilot reported the aircraft avionics went off line and they smelled a burning electrical smell. Pilot diverted and found post flight that a circuit breaker had popped.

Narrative

While enroute IFR to ZZZ [airport]; my No 1 Nav/com; an Avidyne IFD440; went off line with Red Xs on the VHF portion. I smelled a burning electrical smell; and later learned that the Circuit breaker had popped. I [advised ATC]; established communications with ATC on 121.5 using my number two radio. I diverted to the nearest airport; ZZZ1; and cleared to land; which I did uneventfully. I removed the radio from the tray; and detected a burning smell inside the radio. I inspected the aircraft carefully for any electrical anomalies or burning; including by removing the cowl; and inspecting the tray. I reset the circuit breaker; which did not pop. The fire crew on the ground used their infrared thermometer and detected no unusual heat; or burning; within the aircraft. I flew back to ZZZ2 [airport] without incident using the no. 2 Nav/comm with a handheld radio available in case it was needed. On the following day; Day 1; I arranged for an aircraft mechanic to inspect the plane; which occurred Day 2. The mechanic reported no anomalies or discrepancies with the aircraft and authorized continued flights..