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Index 2007

Phase detection circuit

Published:2011/4/25 22:55:00 Author:Nicole | Keyword: phase

Phase detection circuit
The blance full wave phase detector of IR spectrum system adopts RCA7360 light beam deflection tube, this deflection tube has 2 deflectors, it is used to transform the light beam from one electrode to another. The deflection tube switching action is controlled by reference waveform which is synchronous with input singal. Connecting a capacitor(8μF or 40μF) to output terminal, after charging with two and a half cycles, it will obtain a multiplication with the standard of input value. (View)

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Digital display pressure measuring circuit diagram

Published:2011/4/26 2:06:00 Author:Nicole | Keyword: digital display, pressure measuring

The figure (1) is a digital display pressure measuring circuit diagram. The performance of this circuit: the additional voltage is about 12.8V, the current is 30mA; when it is maximum gain, the input voltage range is 0.8mVW; the zero adjustment range is ±1mV/V; the shown value is 0-1999; the zero shift is 2μV/℃; the additional voltage shift is 0.005%℃; the nonlinear is ±0.05%FS; the noise peak-peak value is 1.5μV. LC filter is composed of L1、L2、C1 and C2, it is used to decrease the influence of electromagnetic noise. (View)

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Five-function electronic watch circuit

Published:2011/4/26 0:55:00 Author:Nicole | Keyword: electronic watch

Five-function electronic watch circuit
This electronic watch circuit is composed of DG5001 and LCD display. DG5001 is single chip CMOS watch special IC, it is adapted to 3 1/2 bit LCD, it has the advantage of micropower (lower than 3μA), low voltage(1.5V), small timing error(0.5s/d). The show contents: month, day, hour(morning A/afternoon P), minute, second. The range of work voltage is 1.35~3.50V, the range of temperature is 0~70℃, storage temperature is -20~+75℃. Using two perpheral switches S1, S2 can change the show contents and check of the timing. The crystals oscillation frequency is 32768Hz, adjusting the Trimmer capacitor can check of the time precision. (View)

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Night vision benchmark circuit

Published:2011/4/26 0:35:00 Author:Nicole | Keyword: night vision, benchmark

Night vision benchmark circuit
The night visual range of this benchmark is not shorter than 500m, using 4 2-type batteries, it can constantly work more than 30h, it can be used for night linear measuring, or used as singal device labelled. Interval oscillator is composed of BG4 and L, it changes 6V DC power into 220V AC power, igniting 3W cold cathode fluorescent tube then to used it as the source of night vision benchmark. The tube can choose red, white, green three colors according to the needs. BG3 is switching tube, it is controlled by oscillator, to make tube flash. K2 is working transfer switch, when it is need to keep tube lighting, it can cut off K2. (View)