rrafrf25

single chip hardware circuit design of main conol system of the host system uses the company's high-performance microconoller atmel at89s51 achieved. using a home-based tc9012 chip as the system's infrared remote conol ansmitter; mcu p3.2 port connector integrated infrared receiver hs0038 out data output terminal; mcu p1.0 port as the output pwm signal and connect pt4115 dim-side chip, used to implement pwm dimming conol. microconoller through the infrared remote conol buttons and switches 0 to 9 keys infrared identification coding and decoding, and according to decoding results to key corresponding pwm signals to drive led to achieve a different brightness adjustment. system, crystal oscillator circuit consists of 12mhz 30pf capacitors composed of the two; reset circuit from s1 button, 10k resistor and 10uf elecolytic capacitor. main conol system circuit shown in figure 5. 3.2 .neon beer sign
(rated voltage of 220v for example) and some equipment to be made. a: high-temperature test. major test equipment: incubators, thermometers, voltage regulator, voltmeter and clock. main test items: high-temperature low-pressure start, high security operation. the number of tests: 10. test method: tested lamps into the thermostat, connect the circuit, the voltage regulator's output voltage to 180v (only to be measured lamp voltage regulator power supply), turn the power incubators, the temperature set at 60 until the temperature inside rose to 60 , open the lamp power, observe the lighting is working properly, then the regulator rose to 250v, allowed to work 24 hours, observe the results. in case of light damage to the thermal deformation of materials and abnormal phenomenon is the experiment failed. b: the impact of high temperature and pressure start test. illuminated signs
according to glue on the led heat sink temperature thermocouple reflect and measure the final test circuit in figure 2 is based on led forward voltage drop is stable, indicating that the led lamp has reached a set point temperature of the thermal equilibrium. when the temperature of each time period is about to end, start measuring the forward voltage drop measured led vf, according to the actual measured time a t, derived from figure 3, is amended a vf. vf the measured value plus a vf, d1 obtained from the temperature measuring current impacts vf1, that vf1 = vf1 + a vf, to the vf1 and measured with a thermocouple based temperature t1 into given the computer database, repeat this step, we can draw a set of revised values. the revised value of this group automatically import the database, you can generate within the led lighting apparatus of the vf-tj curve. trade show displays