The cases described in neon light control , does not work during the day , night work automatically power , can control 4 groups of lights or four buildings in ascending order of neon light pattern . Circuit works The neon light control circuit from the power circuit , light -controlled electronic switch , pulse generator and lighting control circuit , as shown in Figure 1-185 . Power circuit from the power transformer T, rectifier diode VDl-VD4, resistor R13, capacitors Cl-C4, light-emitting diodes and three terminal regulator IC VL5 ICI component . Light -controlled electronic switching circuits controlled by the optical transistor Vl, transistor V2, electronic switch circuit IC2, resistors Rl-R3 and variable resistor RPl composition .

Pulse generator circuit consists of resistors R4, variable resistor RP2, capacitors C5, C6 , and the composition of the time base circuit IC3 . Lighting control circuit by the time-base integrated circuit IC4, diode VD5-VDll, LED VLl-VL4, resistance Device R5-Rl2, transistor V3-V6, grain boundary and the neon tube VTl-VT4 HLl-HL4 composition . AC 220V voltage by T Buck , VDl-VD4 rectification , Cl filtering , ICl regulator after the C4 + I2V voltage generated at both ends . Daytime ; Vl was low resistance state by light irradiation , V2 closed , IC2 electronic switch inside the prison is low and is 5 feet off the state , lC3 and 1C4 -free + l2V voltage , VTl-VT4 are closed , HLl-HL4 not Light .

Night , Vl no light exposure and become high impedance state , V2 is partial conduction , IC2 into 5 feet high , its internal electronic switch to turn on , 2 feet , 3 -pin +12 V output voltage , lC3 and 1C4 Power work . Work oscillation pulse generator , the output from the lC3 3- foot low-frequency oscillation signal , as I told the first 14 feet of the count pulse . IC4 role in the counting pulse , its YO-Y5 output side order of rotation is high , so that V3-V6 and VT1-VT4 turn turn , turn neon lit door HLl-H . When IC4 of Yl -side output high when , V3 and VTl turn , VL4 and HLl lit . When IC4 of Y2 -side output high when , V3, V4 and VTl, VT2 are conduction , VL4, VL3 and HLl, HL2 are lit . When IC4 of Y3 -side output high when , V3-V5 and VTl-VT3 are conduction , VL2-VL4 and HLl-HL3 were lit . When IC4 of Y4 -ended output high when , V3-V6 and VTl-VT4 are conduction , VLl-VL4 and HLl-HL4 were lit . When IC4 of Y5 -ended output high when , IC4 forced reset , YO -side output high , V3-V6 and VTl-VT4 are closed , VLl-VL4 and HLl-HL4 are off . Neon lit one by one they all followed , and then all off, the work process cycle . Adjustment RPl of resistance , can change the sensitivity of light control . Adjusting the resistance of RP2 , can change the oscillation frequency of the pulse generator , thereby changing the speed of light the neon transformation . Components Selection Rl-Rl2 use 1/4W metal film resistor or a carbon film resistors . RPl and RP2 are selected organic solid variable resistor . Cl, C4 and C5 are selected voltage value of 16V aluminum electrolytic capacitor ; C2, C3 and C6 use the monolithic capacitor or polyester capacitors . VDl-VD4 1N4007 type silicon rectifier diodes are used ; VD5-VDll are used 1N4148 silicon switch diode . VL1-VL5 use f3mm or f5mm LEDs . Vl use 3DU series of photosensitive transistor ; V2-V6 used S9013 or S9014 silicon NPN transistor . VTl-VT4 are selected 6-1OA, 600V bi-directional thyristor . ICl use LM7812 or CW7812 -type three-terminal regulator IC ; IC2 use TWH8778 or QT3353 electronic switch IC ; IC3 selected time-base integrated circuit NE555 type ; IC4 use CD4017 type decimal counting / pulse divider . T optional 5-8W, 13-15V secondary voltage power transformers .