Figure 2, Wiring Diagram of a Synchronous Vibrator Supply. The diagram is of a device that will deliver DC voltage of 110 to 170 volts from a 12 volt DC source. The positive 12 volt line goes through a fuse, current not indicated, and a switch to the center tap of the primary winding of the transformer. The C L C filter which was shown in figure 1 is not shown although it should be used. The fuse and switch in this figure should also be added to figure 1. The transformer has a dual line voltage primary, 120 and 240 volts. The two windings are connected in series to make a center tapped winding. The secondary is 24 volt C T. The primary and secondary have been interchanged. That is the dual 120 240 volt windings are being used as the secondary and the 24 volt C T winding is being used as the primary. The vibrator is shown inside a circle. In this diagram it is labeled K1A. There is an inductor, coil of wire, connected to pins 3 and 4. Pins 1 and 2 each connect to stationary contacts. There is a movable contact shown between the two stationary contacts but it is not touching either one. The stationary contact is connected to pin 3. Lines coming out from the circle indicate that pin 4, one end of the coil, is connected to the center tap of the transformer primary. Pin 3, other side of coil and movable contact, connects to ground. Pin 1, one of the stationary contacts, connects to the top of the transformer primary. Pin 2, other stationary contact connects to the bottom of the transformer primary. The movable contact is a light reed that has a mechanical resonant frequency of about 100 Hz. The coil is tuned to the same frequency by an external capacitor which is not shown. On the secondary side of the transformer, what used to be the primary, the center tap connects to the positive end of C4, 47 u f 450 volt. The negative end is grounded. We will return to this capacitor later. There is a capacitor, C T, connected across the entire secondary. No value is given for this capacitor. In place of the tube shown in figure 1 there is what appears to be a second vibrator. It is not but is actually part of the vibrator shown on the primary side. This is indicated by the label K1B. The two stationary contacts and the one movable contact should have been drawn inside the circle of the symbol in the primary circuit. The coil in K1B is physically the same coil as that shown in K1A. The proper symbol would have one coil and two sets of contacts. In K1B the upper stationary contact goes to the top of the transformer secondary winding. The lower stationary contact connects to the lower end of the secondary. The movable contact is grounded. Now we return to C4. The positive of C4 goes to one end of a filter choke, 5 H 125 mA. The other end of the filter choke goes to the positive end of C5, another 47 u f 450 volt electrolytic capacitor. The negative end of C5 is grounded. The junction of the choke and C5 goes to a point labeled B plus. This completes the verbal description.