A transformer has the low side of its primary connected to one prong of the line plug. The other prong of the plug goes through an on/off switch then a one half amp fuse to the top of the transformer primary. The 6.3 volt secondary connects to a number 47 lamp. The bottom end of the 280 volt secondary connects to the common (negative) line. The center tap of the transformer winding goes to one side of a single pole double throw switch. This side is labeled 200 V. The top of the winding goes to the other side of the switch which is labeled 400 V. The swinger of the switch connects to the anode of a diode which is labeled 1000 P I V @ 1 amp. The diode cathode connects to the positive of a capacitor which is labeled 10 microfarad 450 volt. The negative side connects to circuit common. A 150 k ohm 2 watt resistor is connected in parallel with the capacitor. The positive side of the capacitor connects to one end of a 10 meg ohm 1 fourth watt resistor. The other end connects to the positive side of a 0 to 50 micro amp meter. The negative side of the meter connects to the top capacitor test terminal. The bottom capacitor test terminal connects to circuit common. End verbal description.