Temperature control of quartz crystals of transmitters or other equipment may be needed. Of course, with heater only you need room cooler than setting of thermostat.
Line voltage powers this Temperature Control Box / Oven. A porcelain socket holds the 60 Watt light bulb and the SPST represents line voltage thermostat that you get at hardware store. The 1 mF 200 volt rated capacitor is if the points of thermostat need current flow absorbed when points of thermostat open and close.
A tight box with Masonite insulating board about 6.5 X 8 X 9 inches for small regulated temperature area.
A slot could be cut through side of box and regular thermometer mounted over opening to give reading when box is closed.
