Published:2011/10/24 22:22:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 22:22:00 Author:Ecco | Keyword: computer board
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Published:2011/10/30 22:17:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/30 22:25:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/30 22:24:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/30 22:24:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/30 22:23:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/11/1 22:19:00 Author:Ecco | Keyword: Analog temperature controller
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Published:2011/10/24 21:18:00 Author:Ecco | Keyword: Colpitts oscillator , adjustable frequency
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Published:2011/10/24 21:30:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 21:29:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 21:29:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 21:28:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 21:27:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 21:26:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 21:23:00 Author:Ecco | Keyword: computer board
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Published:2011/10/24 21:22:00 Author:Ecco | Keyword: computer board
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Published:2011/10/31 20:56:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/31 2:22:00 Author:May | Keyword: Timing , automatic AC shutdown
Befeore it gets power, the timing clock generator is reset by the capactor of the pin 12 of IC, and the various output stages are in low potential. Because out-port Q14 outputs low level, the triode VT1 closes, the VT2 is breakover, relay J gets the electricity, then the contacts pull in. AC OUT is the AC output socket, which may serve as the head light, miniature ceiling fan and other AC electric appliances without timing device. The CD4060 integrated circuit has the 14-level binary counting/divider with clock pulse oscillator. Adjusting potentiometer RT can change the fixed time, and the timing time is approximately between 20 second ~4.5 hour.
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Published:2011/10/31 3:02:00 Author:May | Keyword: FM transmitter, wireless speaker
This circuit consists of transistor BFR34A,and the figure(a) shows its mechanical structure, when it worksat operating point, Uce=12V, Ic=17mA, theoutput power is12mW.Figure (b) is thebasic circuit. The collector's pins are grounded for better heatdissipation. The optimal phase condition of feedback between tmitter and collector isadjustedby coaxial wire. Variable output coupling capacitor is composed of the small thin plate with side length in5mm.
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