Published:2011/8/13 6:49:00 Author:Ariel Wang | Keyword: absolutely useful , switch power supply, two chips system
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Published:2011/8/13 6:53:00 Author:Ariel Wang | Keyword: output, scale count
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Published:2011/8/12 21:19:00 Author:Ariel Wang | Keyword: Demodulator, PLL, FM, detector, radio frequency
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Published:2011/8/12 21:21:00 Author:Ariel Wang | Keyword: IF, RF, Filter switch
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Published:2011/8/12 22:05:00 Author:Ariel Wang | Keyword: Oscillator, radio frequency , Buffered, Butler
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Published:2011/8/12 21:30:00 Author:Ariel Wang | Keyword: IF , radio frequency , NPN , amplifier
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Published:2011/8/12 21:32:00 Author:Ariel Wang | Keyword: IF, radio frequency , NPN , amplifier , AGC, bias
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Published:2011/8/12 21:33:00 Author:Ariel Wang | Keyword: IF, Universal, radio frequency , amplifier
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Published:2011/8/12 21:36:00 Author:Ariel Wang | Keyword: Mixer, Dual, NPN , RF
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Published:2011/8/12 21:35:00 Author:Ariel Wang | Keyword: Mixer, radio frequency , Dual-gate , MOSFET
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Published:2011/8/12 21:40:00 Author:Ariel Wang | Keyword: Mixer, radio frequency , Dual , JFET
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Published:2011/8/12 22:00:00 Author:Ariel Wang | Keyword: Mixer, Dual, MOSFET, RF
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Published:2011/8/12 22:01:00 Author:Ariel Wang | Keyword: mixer, RF, JFET
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Published:2011/8/12 21:20:00 Author:Ariel Wang | Keyword: Demodulator, Product detector, radio frequency
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Published:2011/8/12 21:16:00 Author:Ariel Wang | Keyword: automatic, measuring instrument
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Published:2011/8/12 21:13:00 Author:Ariel Wang | Keyword: demodulator, radio frequency , FM, discriminator
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Published:2011/8/12 21:12:00 Author:Ariel Wang | Keyword: Demodulator, radio frequency, IF, subsystem
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Published:2011/8/12 21:10:00 Author:Ariel Wang | Keyword: 555, optical tester
It is the optical tester circuit.It consists of photoelectric sensor,monoflop and audio circuit.The photoelectric sensor uses photocell 2CR33.
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Published:2011/8/12 21:02:00 Author:Ariel Wang | Keyword: amplier, Voltage-tuned , Dual-gate, MOSFET, RF , amplifier
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Published:2011/8/9 17:57:00 Author:Vicky | Keyword: Monolithic, Alarming Timer
Monolithic Alarming Timer
IC1 is a 14 decimals counter/frequency divider and oscillator, which can work in a relatively wider range of frequency. When S1 closes, R4 and C2 can generate positive pulse when are turned on, and reset the counter. Then it begins counting. When it comes to 14 decimals, the 3 pin represents high level, and T1 drives the piezoelectric buzzer to produce sound. The time delay function can be adjusted by P1. Then relationship between time delay and parameters of components is shown as follows:
1 ~ 30 min: C1= 200mF; P1= 500KΩ;
1 ~ 60 min: C1= 470mF; P1= 500KΩ;
1 ~ 200 min: C1= 470mF; P1= 1MΩ. (View)
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