Circuit Diagram

875p computer motherboard circuit diagram 045

Published:2011/10/30 22:42:00 Author:Ecco | Keyword: computer motherboard

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875p computer motherboard circuit diagram 046

Published:2011/10/30 22:43:00 Author:Ecco | Keyword: computer motherboard

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875p computer board circuit diagram 71

Published:2011/10/24 22:26:00 Author:Ecco | Keyword: computer board

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875p computer board circuit diagram 72

Published:2011/10/24 22:26:00 Author:Ecco | Keyword: computer board

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875p computer board circuit diagram 73

Published:2011/10/24 22:27:00 Author:Ecco | Keyword: computer board

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875p computer motherboard circuit diagram 074

Published:2011/10/31 21:08:00 Author:Ecco | Keyword: computer motherboard

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The power supply circuit diagram of COMPAQ 472P multi-frequency monitor

Published:2011/11/7 18:58:00 Author:Ecco | Keyword: power supply, COMPAQ , multi-frequency monitor

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The power supply circuit diagram of COMPAQ 460461 VGA multi-frequency color display

Published:2011/11/7 19:00:00 Author:Ecco | Keyword: power supply , COMPAQ , VGA , multi-frequency , color display

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The power supply circuit diagram of AST-1 color display

Published:2011/11/1 20:44:00 Author:Ecco | Keyword: power supply , color display

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The power supply circuit diagram of AOC CM-333 color display

Published:2011/11/1 20:42:00 Author:Ecco | Keyword: power supply , AOC , color display

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The power supply circuit diagram of AOC CM-314 color display

Published:2011/11/1 20:46:00 Author:Ecco | Keyword: power supply, AOC , color display

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The power supply circuit diagram of COMPAQ TE-1420Q VGA multi-frequency display

Published:2011/11/1 20:48:00 Author:Ecco | Keyword: power supply , COMPAQ , VGA, multi-frequency display

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The power supply circuit diagram of COMPAQ 1504 TTL color display

Published:2011/11/1 20:49:00 Author:Ecco | Keyword: power supply , COMPAQ , TTL , color display

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The power supply circuit diagram of dual-frequency high-resolution color display

Published:2011/11/1 20:52:00 Author:Ecco | Keyword: power supply , dual-frequency, high-resolution , color display

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The diode and gate decoding circuit 2

Published:2011/11/7 20:50:00 Author:Ecco | Keyword: diode , gate decoding

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The diode and gate decoding circuit 1

Published:2011/11/7 20:46:00 Author:Ecco | Keyword: diode , gate decoding circuit

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Dynamic audio preamplifier

Published:2011/11/7 20:51:00 Author:Ecco | Keyword: Dynamic audio preamplifier

This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 operates in common base configuration. This is unusuable in audio stages, but in this case, it allows Q1 to operate at low noise levels and improves overall signal to noise ratio. Q2 and Q3 form a direct coupled amplifier, similar to my earlier mic preamp.Input and Output Impedance:As the signal from a dynamic microphone is low typically much less than 10mV, then there is little to be gained by setting the collector voltage voltage of Q1 to half the supply voltage. In power amplifiers, biasing to half the supply voltage allows for maximum voltage swing, and highest overload margin, but where input levels are low, any value in the linear part of the operating characteristics will suffice. Here Q1 operates with a collector voltage of 2.4V and a low collector current of around 200uA. This low collector current ensures low noise performance and also raises the input impedance of the stage to around 400 ohms. This is a good match for any dynamic microphone having an impedances between 200 and 600 ohms.   (View)

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The reference for amplifier circuit

Published:2011/11/7 20:53:00 Author:Ecco | Keyword: amplifier circuit

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Two alternating flashing LED light controlled by digital IC

Published:2011/11/7 20:34:00 Author:Ecco | Keyword: Two , alternating flashing , LED light , digital IC

The chart shows the TTL or CMOS digital integrated circuits controlling circuit, and it uses the transistor to drive two LED lights flashing alternately. Different supply voltage can be used to change the R's value and the VD3 ​​regulation to meet the alternately flashing requirements.   (View)

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The flashing LED controlled by digital IC

Published:2011/11/7 20:35:00 Author:Ecco | Keyword: flashing LED , digital IC

Digital integrated circuits can be TTL or CMOS circuits , and VT uses the general NPN low power tube.   (View)

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