Published:2011/10/26 1:51:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/26 1:49:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/26 1:49:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/26 1:48:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/26 1:48:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/26 1:47:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/26 1:47:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/18 3:44:00 Author:Ecco | Keyword: 555, darkroom , timer circuit
As the figure 17-16 shown, the timing circuit is composed of two branches of 555, IC1 forms a timer, IC2 is a second signal metronome. AN1 is the timer button, clicking the AN1, 555 sets, J pulls in, light exposure lamp H1 is lit, safelight H2 is off. K1 is regular file, when the C1 (or C2) is charged to more than 2/3 threshold level, the 555 resets, J releases. H1 is off, H2 is lit, exposure ended. IC2 and RP2, R4, R5, C4 etc. form astable multivibrator, adjusting the RP2 can make the oscillation be 1Hz. The output of it drives red LED lighting by VT1.
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Published:2011/10/18 3:44:00 Author:Ecco | Keyword: Pin , diagonal connections
FG, SG-Frame Ground- the ground wire connected to the machineTXD, SD-Transmitted Data- data output line RXD, RD-Received Data-data input line RTS, RS-Request to Send- Request to Send dataCTS, CS-Clear to Send data- it responds to other permission and tells the other party that it can send. DSR, DR-Data Set Ready- it can inform the machine is in standby state.DTR, ER-Data Terminal Ready- Data Terminal is informed on standby state.CD, CD-Carrier Detect-carrier detection, which is used to confirm receipt of the Modem carrierSG, SG-Signal Ground-Signal ground line (The signal line is the zero standard line) (View)
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Published:2011/10/18 3:39:00 Author:Ecco | Keyword: Self-made , AVRISP, download , rom recorder
Comparing with an ISP download cable with 74LS244 parallel port, the line and principles of this AVRISP is slightly more complicated. But it has advantages:the serial port's download performanceis more stable than a parallel port, it needs 8 seconds to complete by testing 16k program, and its speed is also fast when it is improved 3.6-firmware. In addition, to the users who are short for parallel port, it is a good choice.
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Published:2011/10/18 3:43:00 Author:Ecco | Keyword: basic test
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Published:2011/10/18 3:42:00 Author:Ecco | Keyword: logic box
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Published:2011/10/18 3:42:00 Author:Ecco | Keyword: Toyota , automatic transmission , D2 oil file
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Published:2011/10/18 3:41:00 Author:Ecco | Keyword: Radio remote control, transmitter
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Published:2011/10/18 3:40:00 Author:Ecco | Keyword: Feedback amplifier
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Published:2011/10/31 21:04:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/31 21:03:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/31 21:02:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/19 1:39:00 Author:Ecco | Keyword: computer motherboard
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Published:2011/10/19 1:39:00 Author:Ecco | Keyword: computer motherboard
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