Single-key touching lamp switch circuit (1)

Published:2012/8/30 22:50:00 Author:Ecco | Keyword: Single-key, touching lamp , switch

It only uses one electrode M to turn on the light and turn off the light. The core component of the circuit is a dual D trigger digital integrated circuit CD4013, and the wiring method of switch is two-wire system with phase switch, and the swicth can directly replace ordinary mechanical switch without changing the indoor original wiring.   (View)

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Single-key touching lamp switch circuit (2)

Published:2012/8/30 22:40:00 Author:Ecco | Keyword: Single-key , touching , lamp , switch

As shown in the figure, it is a single-key touching light switch with voice-activated integrated circuit, it only uses one electrode M to turn on the light and turn off the light. The circuit aAso adopts two-wire connection, it can directly replace the normal mechanical switch.   (View)

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Text-display logic pen (CD4069) circuit diagram with gate circuit

Published:2012/8/30 22:35:00 Author:Ecco | Keyword: Text-display , logic pen , gate circuit

The text-display logic pen is shown in the figure, the text here does not mean high and low in Chinese, but the word h and l in English. Due to the particularity of this two-letter glyphs, you can easily use it to form logic level test with LED digital tube.   (View)

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Battery Level Indicator

Published:2012/9/3 3:10:00 Author:Ecco | Keyword: Battery Level, Indicator

A battery level indicator circuit is depicted in the schematic diagram below. This circuit is designed for 9V battery operation, as this circuit will start dimming below 7V and will be completely turned off at 6V. If you want the LED indicator not to dimming but just abruptly turns off at below 6V, then you can remove R3, and change R1 to 330k. (Source: freecircuitdiagram)   (View)

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LM10 Battery Voltage Threshold Indicator

Published:2012/9/3 2:47:00 Author:Ecco | Keyword: Battery , Voltage Threshold, Indicator

A battery threshold indicator circuit shown in the schematic diagram below has current regulation mechanism in driving the LED. A sufficient current should be satisfied at the minimum voltage but no excessive current when the voltage is at the highest level. Balance pin (5) is used as the reference voltage for regulating the current. This pin generate 23 mV, which is internally temperature compensated. This battery voltage threshold indicator circuit overcomes the difficulties caused by voltage change across the diode biasing resistor. When the voltage on the reference-feedback terminal (8) drops below 200 mV, the reference output (1) rises to supply the feedback voltage to the op amp through D2, so the LED current drops to zero. The minimum threshold voltage for these circuits is basically imited by the bias voltage for the LEDs. Typically, this is 1.7V for red, 2V for green and 2.5V for yellow. These two circuits can be made to operate satisfactorily for threshold voltages as low as 2V if a red diode is used. (Source: freecircuitdiagram)   (View)

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Tachometer Circuit with Single Transistor

Published:2012/9/3 2:35:00 Author:Ecco | Keyword: Tachometer , Single Transistor

A schematic diagram of simple tachometer circuit is shown below. Using only a single transistor as the active component, this tachometer would probably be the simplest one. The input of this circuit can be picked up from ignition pickup coil, or other wiring that gives ignition wave-form. This tachometer circuit works for 0 to 6,000 rpm. R3 is used for calibrating the full scale meter reading, to get valid rpm. The zener diode D1 is used to stabilize the 12-V supply. Here is the schematic diagram of the circuit: (Source: freecircuitdiagram)   (View)

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Strobed Supply Improves Strain Gauge Bridge Efficiency

Published:2012/9/3 2:32:00 Author:Ecco | Keyword: Strobed Supply , Improves, Strain Gauge Bridge , Efficiency

The following schematic diagram shows a method to reduce power consumption without sacrificing the bridge signal output level of a strain gauge. Many situation will be applicable for this strain gauge bridge signal conditioning circuit, where continuous output is not a must. In the long time frame, this circuit will in idle state for almost all the time, with only intermittent quick active states (on times). A very extreme example for this signal conditioning circuit is where remote weight or height level of a storage tanks is sampled once per hour. The idle current is around 150 μA, with active state current typically 50 mA (which is occurs at few milliseconds periods). (Source: freecircuitdiagram)   (View)

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Digital Encoder Circuit Using Stepper Motor

Published:2012/9/3 2:20:00 Author:Ecco | Keyword: Digital Encoder , Stepper Motor

Using circuit depicted in the schematic diagram below, the direction and shaft rotation of stepper motor can be seen on the LED display. Alternative to digital rotation encoder as a digital encoder input, this circuit uses a stepper motor. Here is the schematic diagram of the circuit: (Source: freecircuitdiagram)   (View)

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Direct Coupled Discrete Astable Multivibrator

Published:2012/9/3 1:52:00 Author:Ecco | Keyword: Direct , Coupled, Discrete, Astable Multivibrator

Thisflip-flopcircuitisafreerunning/astablemultivibratorone,withbasesandcollectorofbothemitterbiasedtransistoraredirectlycoupledtoeachother.Switchingactionissupportedbymeansofcapacitorineachemittercircuit.Thisconfigurationproduceatrianglewavesatemitters.Sinceneithertransistorcanremainpermanentlycutoff,thenafreerunningoscillationwillbegenerated.Wecanusesingle0.1uFcapacitorbetweenemittersinplaceofC1andC2. Source:freecircuitdiagram   (View)

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Single Chip Circuit for Multiplication Operation

Published:2012/9/3 1:50:00 Author:Ecco | Keyword: Single Chip , Multiplication Operation

TheAD532shouldbeconnectedasthefollowingfigureforoperationasamultiplier.WecanfedtheinputdifferentiallytotheXandYinputs,orsingleendedbysimplygroundingtheunusedinput.Connecttheinputsaccordingtothedesiredpolarityintheoutput.Toclosethefeedbacklooparoundtheopamp,theZterminalistiedtotheoutput.TheoffsetadjustVosisoptionalandisadjustedwhenbothinputsarezerovoltstoobtainzeroout,ortobuckoutothersystemoffsets. Source:freecircuitdiagram   (View)

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AD532 Squarer Circuit

Published:2012/9/3 1:49:00 Author:Ecco | Keyword: Squarer

Source:freecircuitdiagram Thefollowingschematicdiagramshowsasquaringcircuit.Basically,thiscircuitisasimplevariationofmultipliercircuit.However,thedifferentialinputcapabilityoftheAD532canbeusedtoobtainapositiveornegativeoutputresponsetotheinput.Thiscircuithasusefulfeaturewhichissuitableforcontrolapplications,asitmighteliminatetheneedforanadditionalinvertersomewhereelse.   (View)

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Single Chip Divider Circuit

Published:2012/9/3 1:47:00 Author:Ecco | Keyword: Single Chip , Divider

Source: freecircuitdiagram We can build a divider circuit using only a single chip component, a special purpose integrated circuit AD532. We can configure the AD532 as a two quadrant divider by connecting the multiplier cell in the feedback loop of the op amp and using the Z terminal as a signal input, as shown in the following figure. For your note, the output error is given approximately by 10 Vεm/ (X1-X2), where εm is the total error specification for the multiply mode and bandwidth by fm x (X1-X2)/10 V, where fm is the bandwidth of the multiplier. The X input is restricted to negative values to avoid positive feedback. Thus, connect the input to X and the offset null to X2 for single ended negative inputs. For single ended positive inputs (0V to +10V), connect the input to X2 and the offset null to X1. Gain (S.F) and offset (X0) adjustment are recommended as shown and explained in the following table for optimum performance. The useful range in denominator input is approximately 500 mV ≤ (X1-X2) ≤ 10 V for practical reason. If used, the voltage offset adjust (Vos) is trimmed with Z at zero and (X1-X2) at full scale.   (View)

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Basic Logic Gate with PNP Transistor

Published:2012/9/3 1:46:00 Author:Ecco | Keyword: Basic , Logic Gate , PNP Transistor

Source: freecircuitdiagram This schematic diagram shows a circuit of basic logic gate circuit. This PNP transistor circuit can act as OR gate or AND gate. If the input is closing of switch, this circuit acts as AND gate. This circuit acts as OR gate when the input is opening of switch. The phase inversion of input does not complicate overall circuitry. Here is the schematic diagram of the circuit:   (View)

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Phase-Sensitive Sinusoidal Signals Detector

Published:2012/9/3 1:44:00 Author:Ecco | Keyword: Phase-Sensitive, Sinusoidal Signals, Detector

Source: freecircuitdiagram Using the phase sensitive detector circuit below the magnitude of sinusoidal signal can be measured. Beside that, this circuit also can be used to measures 180°-out-of-phase inputs with proper polarity. But, it depends on the relationship to the reference with less than 1% error. This circuit uses a AD741J op amp. Here is the schematic diagram of the circuit and the pin configuration of AD532:   (View)

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Square Root Mode for AD532 Analog Processor

Published:2012/9/3 1:42:00 Author:Ecco | Keyword: Square Root Mode, Analog Processor

Source: freecircuitdiagram The following schematic diagram shows us about the connections for square root mode for ADS532 analog processor chip. Similar to the division mode, the multiplier cell is connected in the feedback of the op amp by connecting the output back to both the X and Y inputs. To prevent latch up as Zi approaches 0 Volts, the diode D1 is connected. The Vov adjustment is made with Zin = +0.1 V dc in this case, adjusting Vos to obtain -1.0 V dc in the output, Vout =-√(10 VZ). Gain (S.F) and offset (Xo) adjustments are recommended for optimum performance.   (View)

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Difference Of Squares Analog Computing

Published:2012/9/3 1:40:00 Author:Ecco | Keyword: Difference , Squares Analog Computing

Source: freecircuitdiagram Because the differential input capability of the AD532, algebraic solution of several interesting functions such as difference of squares, (X2-Y2)/10V is allowed. The following figure shows us about the configuration of AD532 in the square mode, with a simple unity gain inverter connected between one of the signal inputs (Y) and one of the inverting input terminals (-Yin) of the amplifier. For unity gain and best accuracy, the inverter should use precision (0.1%) resistors or be otherwise trimmed.   (View)

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Direct driving capacitive input high-speed A/D converter circuit diagram with INA155/156

Published:2012/8/30 1:42:00 Author:Ecco | Keyword: Direct driving , capacitive input , high-speed A/D converter

In the figure, G = 10. Input voltage is sent to 12-bit high-speed low-power sampling A / D converter ADS7818 or ADS7834 after being amplified by INA155. The internal input terminal of ADS7818 or ADS7834 is the capacitor array (CDAC), namely the capacitive input, and A / D converter converts the input analog signal to 12-bit digital signal output, fSAMPLE = 500kHz.   (View)

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Phase adjustable circuit diagram

Published:2012/8/29 21:30:00 Author:Ecco | Keyword: Phase adjustable

In the diagram (a), it is a phase adjustable circuit with digital set composed of PLL IC, and the PLL IC 4046B and divider 4040B form the circuit with output signal frequency being 360 times of the input signal frequency, and the following is counter 451OB with the digital switch so that the phase change between 0 ~ 360°. The circuit's operating frequency range is from several tens to several hundreds Hz the phase is 0 ~ 360 °, and the resolution is 1 °. The drawback of the circuit is slow to respond, and needs to be set with digit. Figure (b) shows circuit scheme, FIG (c ) is an operation timing diagram. In the diagram (b), the current flowscapacitor C to become the constant current IC, then the voltage Uc on C raises like the straight line shown in (c).   (View)

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Active low-pass filter circuit diagram

Published:2012/8/29 21:18:00 Author:Ecco | Keyword: Active low-pass filter

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The MOS FET inverter circuit diagram of power transformer

Published:2012/8/30 1:51:00 Author:Ecco | Keyword: MOS, FET, inverter , power transformer

It mainly consists of MOS FET, ordinary power transformer. Its output power depends on the power of MOS FET and power transformer. It has no the cumbersome transformer winding, so it is suitable for the amateur production of electronics enthusiasts.   (View)

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