Circuit Diagram

RS232 serial port communication circuit

Published:2011/8/13 1:02:00 Author:qqtang | Keyword: serial port, communication circuit

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The DC current measurement circuit

Published:2011/8/13 1:03:00 Author:qqtang | Keyword: DC current, measurement

Figure 2-40-10 The DC current measurement circuit   (View)

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The DC voltage test ciruit

Published:2011/8/13 1:05:00 Author:qqtang | Keyword: DC voltage, test ciruit

Figure 2-40-8 The DC voltage test ciruit   (View)

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The digital camera special circuit

Published:2011/8/13 1:07:00 Author:qqtang | Keyword: digital camera, special circuit

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM337L

Published:2011/8/23 22:25:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

LM337L--the adjustable stabilizer (negative output) This is a negative output stabilizer with adjustable output voltage; its output voltage range is -1.2~-37V; output current is 100mA; input stability typical value is 0.01%/V; the max input-output voltage difference is 40V; it contains the current limitation, overheat protection and secure working area protection circuit.   (View)

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The 1~17 system counter composed of CD4017 (1)

Published:2011/8/13 1:12:00 Author:qqtang | Keyword: 1~17 system, counter

The decimal counter is used most in people's daily life, but in some situations, counters of other system are needed. Here is to introduce a 1~17 system counter composed of the decimal counting integrated circuit CD4017, whose circuit is shown in the figure.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM320L/320ML

Published:2011/8/28 3:24:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

The 3-terminal stabilizer of LM320L/320ML series (the negative output)This is a negative output 3-terminal stabilizer of fixed output voltage; the output voltage can be -5V, -12V and -15V; the output of LM320V and that of LM320ML is 250mA; the output voltage difference is ±5%; the max input stability is 0.07%/V; the max stability of load is 0.01%/mA; the max input voltage is -35V; the working temperature is 0~+70℃; LM320L is in TO-92 plastic package, LM320ML is in TO-202 plastic package.   (View)

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The regulator: DC-DC circuit and power supply monitor pin and its main features LM317L

Published:2011/8/29 2:32:00 Author:Seven | Keyword: regulator, power supply, monitor pin

The LM317L adjustable stabilizer (positive output)This is a stabilizer whose output voltage is adjustable; the output voltage range is 1.2~37v; the output current is 100mA, the typical value of input stability is 0.01%/V; the typical value of load stability is 0.1%; the max input-output voltage difference is 40V; it contains the current limitation, overheat protection and secure working area protection circuit.   (View)

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The winding machine electric counter with adding function (CD40110 and CD40106)

Published:2011/8/14 21:42:00 Author:qqtang | Keyword: winding machine, electric counter

The winding machine is a common tool in electrical industry, the traditional winding machine is counting by mechanism, as the reason of wear and tear, the precision can't be sure. If the photoelectric sensor is used as the counting trigger, due to its non-contact character and high sensibility, the precision can be improved largely. The counter also has adding function, so it is convenient to modify the error, the circuit is shown in the figure.   (View)

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The regulator: DC-DC circuit and power supply monitor pin and its main features LM196/396

Published:2011/8/29 2:37:00 Author:Seven | Keyword: regulator, power supply, monitor pin

LM196/396--the adjustable 3-terminal stabilizer (positive output)This is a 3-terminal stabilizer with a fixed output voltage; the output voltage is 1.25~15V; the output current is 10A, the input stability typical value is 0.005%/V; the max power consumption is 70w; the max input-output voltage difference is 20V; it contains the current limitation, overheat protection and secure working area protection circuit.   (View)

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The regulator: DC-DC circuit and power supply monitor pin and its main features LM185-1.2/285-1.2/385-1.2

Published:2011/8/29 2:48:00 Author:Seven | Keyword: regulator, power supply, monitor pin

LM185-1.2/285-1.2/385-1.2--the reference voltage circuit (+1.2V)This is a 2-terminal reference voltage circuit of high-precision, low-temperature drift and low-noise; the output voltage is 1.235V; the output voltage fault of LM185-1.2/LM285-1.2 is ±1% and that of LM385-1.2 is ±2%; the working current range is 10μA~20mA; the temperature drift is 20*10-6/℃; the long-term stability is 20*10-6/1000h, the max inverting current is 30mA; the max non-inverting current is 10mA; the working temperature of LM185-1.2 is -55~+125℃.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM1851

Published:2011/8/23 22:23:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

LM1851--the electricity leakage halter control circuit This is an electricity leakage halter control circuit composed of the difference amplifier lock circuit and stable circuit; if the electricity leakage is tested out, the external SCR is triggered, all the electricity halters with external SCR is cut off; the testing LEV of the leaking current can be set; the current breakdown time can be set; it can directly drive the SCR; the maximum current source input current is 19mA; the power consumption is 570mA; working temperature is -40~+70⁰C.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM120

Published:2011/8/24 22:07:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

The 3-terminal stabilizer (negative output) of LM120 series This is a 3-terminal stabilizer with fixed output voltage; the output voltage can be -5V, -12V and -15V; the output current is 1.5A; the output voltage fault is ±3%; when the output is -5V, the max output voltage is -25V; when the output is -12V, the max output voltage is -35V; when the output is -15V, the max output voltage is -40V; it contains the over-current limitation and over-heat cutoff circuit.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM117/217/317

Published:2011/8/24 22:15:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

LM117/217/317--the adjustable 3-terminal stabilizer (positive output) This is a 3-terminal stabilizer with adjustable output voltage; its output voltage range is 1.2~37v; the max output current is 1.5A; the typical value of input stability is 0.01%/V; the max input-output voltage gap is 40V; it contains the current limitation, over-heat protection and secure working area protection circuit; the approximate types are μA117, μA217, μA317, SG117, SG217, SG317, CW117, CW217, CW317.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM150/250/350

Published:2011/8/23 22:23:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

LM150/250/350--the changeable 3-terminal regulator (forward output) This is a 3-terminal regulator whose output voltage is adjustable; its output voltage range is 1.2~33V; its output current is 3A; its input stable typical value is 0.005%/V; its load stable typical value is 0.1%V; the maximum input-output voltage difference is 35V; LM250/250 is only packaged in metal package, LM350 can be packed in either metal or plastic package.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM123/223/323

Published:2011/8/24 21:59:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

LM123/223/323--the 5V stabilizer This is a stabilizer with fixed output voltage; the output voltage is 5V; the output current is 3A; the typical value of its output impedance is 0.01Ω; the max input-output voltage difference 20V; the power consumption is 30W; it contains the current limitation, power limitation and over-heat cutoff circuit.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features M51920P

Published:2011/8/28 3:00:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

M51920P--the display and alarm drive circuit when the power supply voltage is too lowThis is a drive circuit of displaying alarm; the buzzer, ring and indicator can be driven by 1 cell; the voltage range of the working power supply is 1.1~1.8V(the regulated voltage is 1.5V); the additional power consumption typical value is 5μA; the power supply limit range is -0.2~2.0V; when the output is saturated, the output current of AO terminal is 300mA; the output current of L3 is 70mA; the power consumption is 600mW; the working temperature is -15~+65℃; it contains the 4-stage frequency distributor and buffer of the reset terminal.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features M5231

Published:2011/8/28 2:49:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

M5231--the adjustable stabilizer (positive output)This is a stabilizer whose output voltage is adjustable; the output voltage range is 3~50V; the step-up time of the output voltage can be adjusted; the input voltage range is 8~70V; it contains the over-heat limitation and over-heat protection circuit.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features M5231TL

Published:2011/8/28 2:46:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

M5231TL--the adjustable stabilizer (positive output)This is a stabilizer whose output voltage is adjustable; the output voltage range is 3~50V; the voltage range of the working power supply 8~70V; the output current 20mA; the typical value of the output noise voltage is 6μVrms; the output voltage step-up time of the available external resistor is set to be a constant; the power consumption 300mW; the working temperature -20~+75℃; it contains the current limitation and over-heat protection circuit.   (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features M5236

Published:2011/8/28 2:38:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

M5236--the adjustable 3-terminal stabilizerIt composes the 3-terminal regulated circuit whose output voltage adjustable with the external transistor and resistor; the output voltage range is 1.5~33V; the input voltage range is 3.5~36V; the max input-output voltage difference is 30V; the power consumption of the TO-92L is 900mW, and that of SOT-89 package is 500mW; the working temperature is -20~+75℃; in contains the secure working area protection and over-heat protection circuit.   (View)

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