Circuit Diagram

CodeLock AVR electronic combination lock 4

Published:2013/2/18 21:04:00 Author:muriel | Keyword: CodeLock , AVR , electronic combination lock

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CodeLock AVR electronic combination lock 3

Published:2013/2/18 21:03:00 Author:muriel | Keyword: CodeLock , AVR , electronic combination lock

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CodeLock AVR electronic combination lock 2

Published:2013/2/18 21:03:00 Author:muriel | Keyword: CodeLock, AVR , electronic combination lock

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CodeLock AVR electronic combination lock 1

Published:2013/2/18 21:02:00 Author:muriel | Keyword: CodeLock , AVR, electronic combination lock

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Simple electronic combination lock

Published:2013/2/18 21:01:00 Author:muriel | Keyword: Simple electronic , combination lock

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Electronic Combination Lock 1

Published:2013/2/18 21:00:00 Author:muriel | Keyword: Electronic Combination Lock

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Electronic Card-Lock System

Published:2013/2/18 20:59:00 Author:muriel | Keyword: Electronic Card-Lock System

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Digital Electronic Lock circuit

Published:2013/2/18 20:58:00 Author:muriel | Keyword: Digital Electronic , Lock circuit

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Low Frequency Wien Bridge RC Sinewave Oscillator 3

Published:2013/2/18 20:57:00 Author:muriel | Keyword: Low Frequency, Wien Bridge , RC Sinewave, Oscillator

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Low Frequency Wien Bridge RC Sinewave Oscillator 2

Published:2013/2/18 20:57:00 Author:muriel | Keyword: Low Frequency, Wien Bridge , RC Sinewave , Oscillator

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Low Frequency Wien Bridge RC Sinewave Oscillator 1

Published:2013/2/18 20:56:00 Author:muriel | Keyword: Low Frequency , Wien Bridge , RC Sinewave , Oscillator

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Electronic combination lock based on PIC 2

Published:2013/2/18 20:55:00 Author:muriel | Keyword: Electronic combination lock, PIC

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Electronic combination lock based on PIC

Published:2013/2/18 20:54:00 Author:muriel | Keyword: Electronic combination lock, PIC

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Digital Combination Lock circuit

Published:2013/2/18 20:53:00 Author:muriel | Keyword: Digital Combination, Lock circuit

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Door lock opener

Published:2013/2/18 20:52:00 Author:muriel | Keyword: Door lock, opener

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Pulse oscillator with adjustable duty cycle and frequency

Published:2013/2/18 2:11:00 Author:Ecco | Keyword: Pulse oscillator, adjustable duty cycle , frequency

Pulse oscillator with adjustable duty cycle and frequency is shown as figure.   (View)

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High-side current monitoring circuit with INA168

Published:2013/2/18 2:07:00 Author:Ecco | Keyword: High-side, current monitoring

In the measurement of changed supply current, the return line of the power -side is grounded, sometimes it can not be connected to shunt resistor between the casing and the rack. INA168 is a current detecting circuit ASIC, the indicators are as following: The power supply voltage is 30 ~~ 60V, and the detected current is at least 10A, then the detection output voltage is 4V, the accuracy is less than 1%.   (View)

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Light control energy-saving lamp (1) circuit

Published:2013/2/17 20:42:00 Author:Ecco | Keyword: Light control, energy-saving lamp

The working principle of the circuit is shown as figure, it is composed of the photoelectric conversion part, NAND gate, differential circuit and control circuit. When there is light, the photosensitive diode VD1 gets conduction, the potential of point A reaches the NAND gate YF1 door level, the output terminal of point b shows low potential, YF2 outputs the high potential, C1 and R5 form a differential circuit which outputs positive spikes at the point C, so BG1 gets conduction, J1 is instantaneously pulled ( then release ). Normally closed contact J1-1 is disconnected, CJ1 loses power and releases, the self-protection contact CJ1-1 disconnects, then the light is off.   (View)

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Multi-channel laser burglar alarm circuit

Published:2013/2/17 21:00:00 Author:Ecco | Keyword: Multi-channel laser, burglar alarm

VT1, VT2, RL1, RP1, R1, K and VD6 constitute light control switch, in the daytime, photoresistor RL1 is in a low resistance state, VT1 gets saturated conduction, VT2 is turned off, K relay is not energized, normally open contact J is in a disconnected state, the alarm circuit does not work; at night, RL1 becomes high impedance, VT1 is deadline, VT2 gets saturated conduction, K gets electrical to make J pull in, then the circuit supplies for the whole machine, red light-emitting diode is lit.   (View)

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Simple analog phase detector circuit diagram

Published:2013/2/18 0:20:00 Author:Ecco | Keyword: Simple analog phase detector

It is composed of an operational amplifier TL072 and analog switch MAX4521, it is applicable to PLL circuit or lock-in amplifier. Supply voltage is ± 5V, the input and output signal level is below ± 4V, and the operating frequency is 10Hz ~~ 100kHz. The UiA and UiB are respectively input sine wave and square wave with the same frequency, square wave's duty cycle is 50 %, the output waveform of A1 is shown in Figure (b).   (View)

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