Published:2012/12/13 0:43:00 Author:Ecco | Keyword: Digital circuit, sound and light, control , stairs delay switch
It has all the characteristics of the discrete components circuit, it also has high delay accuracy, high operational reliability and low the discrete nature performance between the various finished products, and therefore very suitable for factory mass production. The circuit has two characteristics: Firstly, the lamp operating time is the soft-start and half-wave AC after being lit, which can greatly extend the service life of the lamp; secondly, lamp lighting time is determined by the time constant of R10 and C5.
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Published:2012/12/13 0:51:00 Author:Ecco | Keyword: Voltage, positive pulse, peak holding
Voltage positive pulse peak holding circuit diagram is shown as below:
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Published:2012/12/13 1:00:00 Author:Ecco | Keyword: internal structure , IC chip
Operating supply voltage range V (10 feet) is 4.5 ~ 35 V; chip has a reference voltage source VREF, and its value relative to ARTIFICIAL GND (6 feet ) is 1.15 V which can output from VREF (7 feet ); ARTIFICIAL GND is the low resistance ground ( ground reference ) of chip, and its level is higher 0.25V than (-) SENSE (4 feet), and the voltage bias provides loop circuit for the the grounded amplifier current, while the voltage sampling negative terminal ( - ) Sense ( i.e. grounded amplifier inverting input terminal ) has a high input impedance.
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Published:2012/12/13 0:49:00 Author:Ecco | Keyword: FM , optical receiver
This circuit is applied to the pulse rate modulation system. In this system, the transmitter changes the pulse rate of modulated light speed in optical fiber, so that the vertical variation is around the frequency of 50kHz center. L14G2 phototransistor converts modulated light to RF signal to restore the original audio signal.
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Published:2012/12/13 1:17:00 Author:Ecco | Keyword: PVDF , heart sound , pulse measurement
Measuring circuit is composed of monostable oscillator ( 4538 ), the divider ( 4024), pulse generator ( ICM7555 ), counter ( 4040), latch ( 74HC513 ), memory ( ROM ), seven-segment latch drive ( 7511 ) and seven-segment digital LED tube. Figure (a) is a structural diagram of the PVDF heart sound pulse sensor. In Figure ( a ), PVDF film is dome-shaped and slightly protruding outward to make a good contact with the skin surface. The PVDF material is flexible to close to the skin, the impedance is matching with the skin, subsequently, even under stress, the pressure does not affect the detection pulse pressure variation, and therefore able to detect a slight ripple signal.
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Published:2012/12/12 21:22:00 Author:muriel | Keyword: 3 volt, LED chaser
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Published:2012/12/12 21:22:00 Author:muriel | Keyword: LED Chasers
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Published:2012/12/12 21:21:00 Author:muriel | Keyword: cascode , BJT , RF amplifier
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Published:2012/12/12 21:19:00 Author:muriel | Keyword: Variable Q1, Emitter Degeneration
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Published:2012/12/12 21:19:00 Author:muriel | Keyword: Q1, Q2, bias version
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Published:2012/12/12 21:18:00 Author:muriel | Keyword: fixed bias version
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Published:2012/12/12 21:17:00 Author:muriel | Keyword: cascode , 2N3904, IF amplifier
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Published:2012/12/12 21:17:00 Author:muriel | Keyword: cascode amplifier
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Published:2012/12/12 21:16:00 Author:muriel | Keyword: Understanding Voltage Divider
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Published:2012/12/12 21:14:00 Author:muriel | Keyword: Cascode, BJT, RF Amplifier
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Published:2012/12/12 21:13:00 Author:muriel | Keyword: 5 MHz , WWV Cascode, Bipolar Amplifier
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Published:2012/12/12 21:12:00 Author:muriel | Keyword: 40-41 meter , band active antenna
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Published:2012/12/12 21:11:00 Author:muriel | Keyword: Tuning, Whip, Other Frequencies
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Published:2012/12/12 21:10:00 Author:muriel | Keyword: broadband version, W7ZOI
The broadband version W7ZOI suggested to try building. I modified the output transformer in the Figure 6 project and tested it with Tom, VE7TW. We really liked it. By adjusting the network trimmer capacitor, I was also able to tune the 30 meter Amateur radio band as well. For 30 meter band use, I peaked the tank circuit at 10.125 MHz by listening to receiver noise with a home brew direct conversion receiver and was suitably impressed.
This is the active antenna design I wll use for my future projects where strong voltage gain is required. If your receiver has a higher impedance such as 500 ohms, you might try using a couple more links on the output transformer secondary winding.
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Published:2012/12/12 21:09:00 Author:muriel | Keyword: Cascode JFET Amplifier
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