📄 samgordon_clock_eng.htm
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<title>SamGordon clock eng</title>
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<td width="100%" bgcolor="#800000"><p align="center"><em><font color="#FFFF00"
face="Arial"><big><strong>SamGordon Digital Clock </strong></big></font></em></td>
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<p align="center"><font face="Arial" color="#0000A0"><strong>1. Main Clock</strong></font></p>
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<td width="100%"><p align="center"><img src="SG_clock_main.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/SG_Clock/SG_clock_main.gif"
width="787" height="538" alt="SG_clock_main.gif (25734 bytes)"></td>
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<td width="100%"><font FACE="Tahoma" SIZE="2" COLOR="#800000"><p ALIGN="JUSTIFY">With
pleasure the lot of friends of digital clocks that use discernible components, will see
this circuit. It's a clock, with 12hour clue, little simpler in the manufacture from the <a
href="samclock_english.htm" tppabs="http://users.otenet.gr/~athsam/samclock_english.htm" target="_blank"><strong>SamClock</strong></a>. It抯 a
designing that became from the friend George Kordogiannis in 1990, which was modified and
corrected in enough points by my, until it reach in the current form. Most completed that
uses is TTL, apart from the IC9 until IC13, that is CMOS, that they have the faculty to
drive display Common Cathode. In the place of 4511 </font><font FACE="Tahoma" size="1"
color="#FF0000">[6]</font><font FACE="Tahoma" SIZE="2" COLOR="#800000">, can be placed the
74LS47</font><font color="#FF0000"><font FACE="Tahoma" SIZE="2"> </font><font
FACE="Tahoma" size="1">[7]</font></font><font FACE="Tahoma" SIZE="2" COLOR="#800000">,
which can drive display Common Anode. In this case it will be supposed they are changed
display Common Cathode in the Fig.2, with Common Anode, changing of course and connection
in DIS1 until DIS5 display.</font><font FACE="Tahoma" SIZE="2"> </font><font FACE="Tahoma"
SIZE="2" COLOR="#800000">In the SL10, come in the pulses frequ. 1HZ [fig.3-4], which then
are divided successively by the IC2 until IC4 and the round this gates, ensuring the clue
of time, in Hours, Minutes and Seconds. The Q1 drive display the tens of hours [Fig.2],
but only the B and C Led of DIS6 display [Fig.2], ensuring clue 1, when needs the clue of
hours it抯 10, 11, 12. The voltages that supply the circuit are divided in two lines.
The voltage +5VA supplies all IC except the IC9 until IC13 and is supplied with voltage in
case of break of network voltage, on the contrary the voltage of +5VB, supplies only the
IC9 until IC13 and display and is interrupted in case of interruption of network voltage,
ensuring thus economy in battery [Fig.5]. If the Q1 is hot, can be placed on a small
heatsink</font><font FACE="Tahoma" SIZE="2"> </font></p>
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<td width="33%" bgcolor="#FFFF80"><p align="center"><font face="Arial" color="#800000"><small><strong>Main
Clock Part List</strong></small></font></td>
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<td width="33%"><font face="Verdana" color="#FF0000"><small>R1=2.2<small>Kohm</small> 1/4W
5%</small></font></td>
<td width="33%"><font face="Verdana" color="#FF0000"><small>IC5-7=74HC32 <small><small>
[3]</small></small></small></font></td>
<td width="33%"><font face="Verdana" color="#FF0000"><small>Q1=<strong><a
href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm" target="_blank">BD139</a> </strong>on Heatsink</small></font></td>
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<td width="33%"><font face="Verdana" color="#FF0000"><small>R2......R38=470<small>ohm</small>
1/4W 5%</small></font></td>
<td width="33%"><font face="Verdana" color="#FF0000"><small>IC6=74HC08 <small><small>
[4]</small></small></small></font></td>
<td width="33%"><font face="Verdana" color="#FF0000"><small>SL1....SL5=7 pin connector</small></font></td>
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<td width="33%"><font face="Verdana" color="#FF0000"><small>IC1-4=74HC390 <small><small>[1]</small></small></small></font></td>
<td width="33%"><font face="Verdana" color="#FF0000"><small>IC8=74HC04 <small><small>
[5]</small></small></small></font></td>
<td width="33%"><font face="Verdana" color="#FF0000"><small>SL6-7=2 pin connector</small></font></td>
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<td width="33%"><font face="Verdana" color="#FF0000"><small>IC2-3=74HC92 <small><small>[2]</small></small></small></font></td>
<td width="33%"><font face="Verdana" color="#FF0000"><small>IC9....IC13=4511 <small><small>[6]</small></small>
or [74LS47] <small><small>[7]</small></small></small></font></td>
<td width="34%"><font face="Verdana" color="#FF0000"><small>SL8=3 pin connector</small></font></td>
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<td width="50%"><font face="Verdana" color="#FF0000"><small><small><small>[1]</small></small>
74HC390 or 74LS390= Dual 4bit Decade and Binary COUNTER</small></font></td>
<td width="50%" colspan="2"><font face="Verdana" color="#FF0000"><small><small><small>[5]</small></small>
74HC04 or 74LS04= Hex inverter</small></font></td>
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<td width="50%"><font face="Verdana" color="#FF0000"><small><small><small>[2]</small></small>
74HC92 or 74LS92= Decade, divide by 12 and Binary COUNTER</small></font></td>
<td width="50%" colspan="2"><font face="Verdana" color="#FF0000"><small><small><small>[6]</small></small>
4511= BCD to 7-segment Latch/Decoder/Driver for <strong>CC</strong> Display*</small></font></td>
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<td width="50%"><font face="Verdana" color="#FF0000"><small><small><small>[3]</small></small>
74HC32 or 74LS32= Quad 2-input OR gate</small></font></td>
<td width="50%" colspan="2"><font face="Verdana" color="#FF0000"><small><small><small>[7] </small></small>74LS47=
BCD to 7-segment Decoder/Driver for <strong>CA</strong> Display*</small></font></td>
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<td width="50%"><font face="Verdana" color="#FF0000"><small><small><small>[4]</small></small>
74HC08 or 74LS08= Quad 2-input AND gate</small></font></td>
<td width="20%"><font face="Verdana" color="#FF0000"><small><strong>CC</strong>=Common
Cathode </small></font></td>
<td width="30%"><small><font face="Verdana" color="#FF0000"><strong>CA</strong>=Common
Anode</font></small></td>
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<p align="center"><font face="Arial" color="#0000A0"><strong>2. Display</strong></font></p>
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<td width="100%"><p align="center"><img src="SG_clock_display.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/SG_Clock/SG_clock_display.gif"
width="778" height="323" alt="SG_clock_display.gif (13544 bytes)"></td>
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<td width="100%"><font FACE="Tahoma" SIZE="2" COLOR="#800000"><p ALIGN="JUSTIFY">In the
Fig.2, exist the clue display. As he is drawn, the drive of display becomes when in the
place of IC9⌨️ 快捷键说明
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