Published:2011/4/6 4:11:00 Author:Nicole | Keyword: laser diode, singal source
This circuit uses laser diode as switch, can obtain 10ns pulse, the repetition rate is more than 100kHz. This circuit is used in optical fiber communication system, the fiber-optic bundle or single fiber can be coupled to laser.
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Published:2011/4/11 4:15:00 Author:Nicole | Keyword: resistance value, choice
This circuit adopts LED indicates whether the measured resistance value is in the 5% range of reservation precision, removing the too large or too small resistance. If make a few changes to circuit parameter, thenit will change the precision precision range. (View)
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Published:2011/4/6 4:11:00 Author:Nicole | Keyword: timing
This timing circuit only use a 5GI555 IC and a TRIAC, with other components form non-contact timer. The timing time 1h is continuous regulation, and the loading power is 200W with low power consumption.
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Published:2011/4/8 2:47:00 Author:Nicole | Keyword: weaving machine, digital controller
When one of warps is broken, the baffle which is hold on to the warp will fall, and the light source of photosensitive tube 3DU21 is blockaded by the baffle. The relay releases, and to control the motor stopped. (View)
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Published:2011/4/8 2:46:00 Author:Nicole | Keyword: radiation thermometer
The detecting element is lead sulfide photosensitive resistance, it can measure the surface temperature more than 100℃. TR1~TR3 are 3 stage amplifiers, they are fixed on the detector, through bootstrap function of bias circuit, match input to 300kΩ resistance of radiation detecting element(6ISV). Adding bias voltage to all levels, to minimize the noise. When enviroment temperature rises, the thermistor with 2kΩ NTC adjusts gain, to make up for the reduction of radiation detecting element sensitivity. Final follower drives main amplifier and indication ammeter(no gave). Radiation detecting element outputs 0.3mV, can obtain 1mV through preamplifier, main amplifier outputs 20mV, it has 10% partial difference in the most sensitive range of 200μA ammeter. This circuit has 5 measuring ranges, the range of measuring temperature is 100~500℃. (View)
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Published:2011/4/12 3:23:00 Author:Ecco | Keyword: Digital display clock , signal source
Digital display clock signal source circuit shown as the chart is taken from a actual circuit of multi-point detection control box . It mainly consists of automatic and manual clock pulse generator pulse generator, pulse counter and digital display.
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Published:2011/4/8 2:47:00 Author:Nicole | Keyword: valve control, plumbic acid battery, charging system
Adopting distributed system is a good way to solve the charging problem of large scale large capacity valve control seal plumbic acid battery, the host is used to monitor overall system, the slave computer is some high power chargers with same structure. (View)
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Published:2011/4/12 3:41:00 Author:Ecco | Keyword: Square-wave generator
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Published:2011/4/12 3:45:00 Author:Ecco | Keyword: 200w , Voltage inverter circuit
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Published:2011/4/8 2:48:00 Author:Nicole | Keyword: high output voltage, regulated power supply
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Published:2011/4/8 2:48:00 Author:Nicole | Keyword: regulated power supply, positive voltage, negative voltage
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Published:2011/4/8 2:49:00 Author:Nicole | Keyword: isolating, gain compensation
The total harmonics distortion of this circuit is lower than 1%, and it can automatic regulation the gain variations which is produced by temperature or other DC in photoelectric isolator. After sampling, the output singal is fed back to FET, to keep constant AC gain. (View)
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Published:2011/4/12 3:47:00 Author:Ecco | Keyword: Zhongyi , refrigerator
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Published:2011/4/12 3:48:00 Author:Ecco | Keyword: Sunflower , refrigerator
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Published:2011/4/8 2:51:00 Author:Nicole | Keyword: switching power supply, integrated chip
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Published:2011/4/8 2:52:00 Author:Nicole | Keyword: switching regulated power supply, overcurrent protection
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Published:2011/4/8 2:52:00 Author:Nicole | Keyword: cap lamp, alarm
This circuit is designed by using cap lamp battery as power supply, it is fixed in mining cap. When the gas is overflow, then the headlight bulb will flash automatically, and with an alarm.
With less component, the circuit makes no difference to cap lamp normal operation, it also has the advantages of low costs, adjustable alarm point, and convenient to carry. (View)
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Published:2011/4/8 2:53:00 Author:Nicole | Keyword: Li-ion batteries
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Published:2011/4/8 2:53:00 Author:Nicole | Keyword: double level, floating charge, charger
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Published:2011/4/8 2:54:00 Author:Nicole | Keyword: precharge function
Composed of MAX1894/MAX1924, lithium ion battery protection circuit has two charging control circuits, they are fast charging circuit and precharging circuit. Having precharge function typical application circuit composed of MAX1894/MAX1924 are as below.
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