Resistor Chip Arrays
Product name: analog birthday candle circuit board welding kit
Product model: TJ-56-128
Working voltage: DC5V
PCB size: 43 * 34mm
Description:
The analog electronic candle has the simulation of "match ignition, wind blowing out". The design prototype comes from the real life scenario. The circuit can be used for birthday party after transformation.
Circuit principle
CD4013 is a double D trigger, which is composed of two identical and independent data type triggers Each trigger has independent data, set, reset, clock input and Q and reverse Q output. This device can be used as a shift odd memory, and can be used as a counter and trigger by connecting the Q output to the data input. When the rising edge of the clock is triggered, the logic level added to the D input terminal is sent to the Q output terminal The setting and reset are independent of the clock, but are completed by the high level on the setting or reset line respectively. This circuit uses a D trigger in the double D trigger 4013, which is connected into the RS trigger form After the power is turned on, the differential circuit composed of R7 and C3 generates a high level differential pulse and adds it to the 1RD end of IC1, forcing the circuit to reset, and the 1Q end outputs a low level, which is sent to the base of the triode V4, V4 is cut off, and the LED D1 does not light
When the thermistor R2 is burned with a lighter (or the infrared receiving diode can be used to replace R2) (the burning time cannot be too long, otherwise the thermistor is easy to burn out), the resistance value of R2 suddenly decreases, showing a low resistance state. The triode V1 is on, and the generated high level pulse is sent to the 1SD end of 4013, so that the 1Q end is turned into a high level, and sent to the base of the triode V4, V4 is on, and the LED D1 emits light. This process is equivalent to lighting candles with matches, At this time, even after t