BE33 pilot reported electrical smoke in the aircraft.

Attributes
ACN	576181
Time
Date	200303
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gnv.airport
State Reference	FL
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	general aviation : personal
Make Model Name	Bonanza 33
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 25 flight time total : 3080 flight time type : 1287
ASRS Report	576181
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	aircraft equipment other aircraft equipment : #2 radio other flight crewa
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : landed in emergency condition flight crew : diverted to another airport flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While on an IFR flight plan from 55J to srq, approximately 35 mi east of ocala, I experienced smoke in the cabin. I immediately shut my electrical system off. (I knew it was an electrical burning system.) I asked ZJX for vectors to the closest airport after declaring an emergency. ATC was very helpful in directing me to gnv. I was cleared to runway 28. The mechanic at ZZZ determined the problem to be my #2 radio. It was removed, all system were checked again, and we continued to srq VFR uneventfully.

Original NASA ASRS Text

Title: BE33 PLT RPTED ELECTRICAL SMOKE IN THE ACFT.

Narrative: WHILE ON AN IFR FLT PLAN FROM 55J TO SRQ, APPROX 35 MI E OF OCALA, I EXPERIENCED SMOKE IN THE CABIN. I IMMEDIATELY SHUT MY ELECTRICAL SYS OFF. (I KNEW IT WAS AN ELECTRICAL BURNING SYS.) I ASKED ZJX FOR VECTORS TO THE CLOSEST ARPT AFTER DECLARING AN EMER. ATC WAS VERY HELPFUL IN DIRECTING ME TO GNV. I WAS CLRED TO RWY 28. THE MECH AT ZZZ DETERMINED THE PROB TO BE MY #2 RADIO. IT WAS REMOVED, ALL SYS WERE CHKED AGAIN, AND WE CONTINUED TO SRQ VFR UNEVENTFULLY.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.