circuit such as for example that designated ck 3000 and manufactured by the general instrument corporation it should be understood however that the invention is not limited to the particular above mentioned gas discharge panel integrated circuit or clock display apparatus 10 is provided with plug 70 for connection to the ac line power supply one side of plug 70 is connected to node a through fuse 71 node a is connected through diode 78 and resistor 80 to anode 50 of display panel 20 the anode of diode 78 being connected to node a cathodes 30 of display panel 20 are connected to respective positive control pins 65 of integrated circuit 60 through lines 67 node a is further connected through diode 84 and resistor 86 to node 27 the cathode of diode 84 being connected to node a the other side of plug 70 is connected to node b which is connected to the voltage limiting circuit generally designated 100 in particular node b is connected to the anode of diode 134 the cathode of diode 134 is connected to the collector of transistor 130 to the emitter of transistor 120 to the positive side of electrolytic capacitor 144 and to the cathode of zener diode 136 the negative side of electrolytic capacitor 144 is connected to node 27 the anode of zener diode 136 is further connected to the cathode of zener diode 138 the anode of which.