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Index 243

Digital circuit sound and light control stairs delay switch circuit ( 1 )

Published:2012/12/13 0:43:00 Author:Ecco | Keyword: Digital circuit, sound and light, control , stairs delay switch

Digital circuit sound and light control stairs delay switch circuit ( 1 )
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. (View)

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Voltage positive pulse peak holding circuit diagram

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: (View)

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The internal structure schematic diagram of UC3907 IC chip

Published:2012/12/13 1:00:00 Author:Ecco | Keyword: internal structure , IC chip

The internal structure schematic diagram of UC3907 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. (View)

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The FM optical receiver circuit diagram

Published:2012/12/13 0:49:00 Author:Ecco | Keyword: FM , optical receiver

The FM optical receiver circuit diagram
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. (View)

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PVDF heart sound pulse measurement principle circuit

Published:2012/12/13 1:17:00 Author:Ecco | Keyword: PVDF , heart sound , pulse measurement

PVDF heart sound pulse measurement principle circuit
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. (View)

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3 volt LED chaser

Published:2012/12/12 21:22:00 Author:muriel | Keyword: 3 volt, LED chaser

3 volt LED chaser
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LED Chasers

Published:2012/12/12 21:22:00 Author:muriel | Keyword: LED Chasers

LED Chasers
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cascode BJT RF amplifier 2

Published:2012/12/12 21:21:00 Author:muriel | Keyword: cascode , BJT , RF amplifier

cascode BJT RF amplifier 2
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Experimentation With Variable Q1 Emitter Degeneration

Published:2012/12/12 21:19:00 Author:muriel | Keyword: Variable Q1, Emitter Degeneration

Experimentation With Variable Q1 Emitter Degeneration
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fixed Q1 and Q2 bias version

Published:2012/12/12 21:19:00 Author:muriel | Keyword: Q1, Q2, bias version

fixed Q1 and Q2 bias version
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fixed bias version

Published:2012/12/12 21:18:00 Author:muriel | Keyword: fixed bias version

fixed bias version
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cascode 2N3904 IF amplifier

Published:2012/12/12 21:17:00 Author:muriel | Keyword: cascode , 2N3904, IF amplifier

cascode 2N3904 IF amplifier
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cascode amplifier

Published:2012/12/12 21:17:00 Author:muriel | Keyword: cascode amplifier

cascode amplifier
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Understanding Voltage Divider

Published:2012/12/12 21:16:00 Author:muriel | Keyword: Understanding Voltage Divider

Understanding Voltage Divider
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Cascode BJT RF Amplifier

Published:2012/12/12 21:14:00 Author:muriel | Keyword: Cascode, BJT, RF Amplifier

Cascode BJT RF Amplifier
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5 MHz WWV Cascode Bipolar Amplifier

Published:2012/12/12 21:13:00 Author:muriel | Keyword: 5 MHz , WWV Cascode, Bipolar Amplifier

5 MHz WWV Cascode Bipolar Amplifier
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40-41 meter band active antenna

Published:2012/12/12 21:12:00 Author:muriel | Keyword: 40-41 meter , band active antenna

40-41 meter band active antenna
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Tuning a Whip To Other Frequencies

Published:2012/12/12 21:11:00 Author:muriel | Keyword: Tuning, Whip, Other Frequencies

Tuning a Whip To Other Frequencies
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broadband version W7ZOI

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. (View)