📄 elect_switch_for_lamb_eng.htm
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<title>Electronic Switch with Delay Time For Lambs</title>
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<td width="100%" bgcolor="#800000" height="19" colspan="3"><p align="center"><font
color="#FFFF00" face="Tahoma"><strong>Electronic Switch with Delay Time For Lambs</strong></font></td>
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<td width="100%" height="9" colspan="3"><font face="Tahoma">.</font></td>
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<td width="100%" height="9" colspan="3"><p align="center"><font face="Tahoma"><img
src="elect_timer_switch_for_lamb1.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/electronic_timer_switch_for_lamb/elect_timer_switch_for_lamb1.gif"
width="1048" height="529" alt="elect_timer_switch_for_lamb1.gif (21827 bytes)"></font></p>
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<td width="100%" height="9" colspan="3"><p class="MsoNormal" style="text-align:justify"><font
face="Tahoma"><span lang="EN-US"
style="font-size:10.0pt;font-family:Tahoma;mso-ansi-language:EN-US">A circuit that will
find enough applications. Basically the designing became in order to exist delay in quench
one or more lamps in a stairwell or in any other space exists this need. It can become
use, for the control various motor or other appliances, what is connected in the contacts
of J3. The activation command is given by exterior pressing switches connected parallel
[Fig2]. Does not exist restriction in the number of these switches. The switches lead with
a simple cable of three cables with small diameter, to the J1. Each switch is constituted
by the pressing switch and Led that works constantly, facilitating to find the place of
switch in dark spaces. If the switches are placed in exterior spaces, it will be supposed
they are waterproof. Parallel to the J2 terminate the switch S2, Led D9, which can be
placed above in the box of circuit or near this or can be used if it does not need. If
pressing anyone of switch excited the Led of optocoupler IC1 the transistor closes and
grounding the entries of gate IC2A, his exit becomes High. Capacitor C3 charges via the D2
roughly in the supply voltage. The exit of IC2B becomes Low the exit of IC2C becomes High.
Transistor Q1 excites it and the RL1. His contacts close and it turns on the lamb that we
have connected in his contacts, and it remains thus until discharge the C2. As soon as we
stop pressing some switch the exit of IC2A goes Low, the C2 it begins discharge through
the R5 and the TR1. Proportionally the resistance of TR1 changes also the time of C2
discharge, hence also the time that the RL1 remains excited. This time depends from the
prices of C2, R5 and TR1. The use optocoupler facilitates in order to we avoid problems of
accidental excitation from parasitic signals in the entry of IC2A. <o:p></o:p></span></font></td>
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<td width="100%" height="6" colspan="3"><font face="Tahoma"><span lang="EN-US"
style="font-size:10.0pt;font-family:Tahoma;mso-ansi-language:EN-US">The circuit supplied
by one relatively simple power supply with stabilization in +12V dc. With switch S1 we cut
the supply of circuit if it needs. <o:p></o:p></span></font></td>
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<td width="100%" height="9" colspan="3"><p class="MsoBodyText" style="text-align:justify"><small><font
face="Tahoma"><span lang="EN-US">The D15 shows the circuit supplies with power and the D12
turns on when the RL1 is on. If him you do not need you can him suppress? The power of
load that will supply the RL1 depends from his contacts. Can place relay with one or more
contacts.</span></font></small></td>
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<td width="100%" height="12" colspan="3"><font color="#FF0000" face="Tahoma"><strong><span
lang="EN-US" style="font-size:10.0pt;font-family:Tahoma;mso-ansi-language:EN-US">Attention,
in the entire region where it exists the high voltage of network, exists always the danger
of electrocution. <o:p></o:p></span></strong></font></td>
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<td width="33%" colspan="2"><font color="#FFFFFF" face="Tahoma">.</font></td>
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<td width="33%" bgcolor="#800000" colspan="2"><p align="center"><font size="2"
color="#FFFF00" face="Tahoma"><b>Part List</b></font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">R1=See Text and Table1-2</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">C3=10uF 25V</font></td>
<td width="34%" colspan="2"><font size="2" face="Tahoma">D4=1N4148</font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">R2-3-7-8=1K 1/4W 5%</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">C6=1000uF 35V</font></td>
<td width="34%" colspan="2"><font size="2" face="Tahoma">J1-2=3pin 3.96mm pin step
Connector </font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">R4=10K 1/4W 5%</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">IC1=4N35 or Similar Optocoupler</font></td>
<td width="34%" colspan="2"><font size="2" face="Tahoma">J3=8pin Connector with Screws</font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">R5=470K 1/4W 5%</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">IC2=4093 CMos</font></td>
<td width="34%" colspan="2"><font size="2" face="Tahoma">RL1=12V Relay with 2, 3 or 6
contacts</font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">R6=33K 1/4W 5%</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">IC3=7812 Regulator 1A</font></td>
<td width="34%" colspan="2"><font size="2" face="Tahoma">S1=On/Off MicroSwitch 1A</font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">TR1=1M Trimmer</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">Q1=BD679 Darlington</font></td>
<td width="34%" colspan="2"><font size="2" face="Tahoma">S2.......6=Push Button [See Text]</font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">C1-4-5=100nF 63V MKT 5%</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">D1-2-3-6....9=1N4002</font></td>
<td width="34%" colspan="2"><font size="2" face="Tahoma">T1=110-230Vac @12V 2A Transformer</font></td>
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<td width="33%" colspan="2"><font size="2" face="Tahoma">C2=4.7uF 25V</font></td>
<td width="33%" colspan="2"><font size="2" face="Tahoma">D4-10-11-12-13-14-15=Red Led 3mm
or 5mm</font></td>
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<td width="39%" colspan="2" align="center" bgcolor="#D90000"><font face="Tahoma"><small><strong><font
color="#FFFF00">Table 1</font><font color="#FFFF80"> [Leds in Parallel]</font></strong></small></font></td>
<td width="39%" colspan="2" align="center" bgcolor="#E60000"><font face="Tahoma"><small><strong><font
color="#FFFF00">Table 2 </font><font color="#FFFF80">[Leds in Series]</font></strong></small></font></td>
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<td width="33%" colspan="2"><font size="2"><p align="center"><font face="Tahoma">Calculate
the value of R1 resistor</font></font></td>
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<td width="39%" colspan="2"><font size="2"><p align="center"></font><font face="Tahoma"><img
src="R1.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/electronic_timer_switch_for_lamb/R1.gif" width="83" height="34"
alt="R1.gif (1388 bytes)"></font></td>
<td width="39%" colspan="2"><font size="2"><p align="center"></font><font face="Tahoma"><img
src="R1B.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/electronic_timer_switch_for_lamb/R1B.gif" width="96" height="36"
alt="R1B.gif (1408 bytes)"></font></td>
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<td width="39%" colspan="2"><font size="2"><p align="center"></font><font face="Tahoma"><small><strong>For
Exable:</strong> 5 Switches with 5 Red Leds 3mm in Parallel.</small></font></td>
<td width="39%" colspan="2"><font size="2"><p align="center"></font><font face="Tahoma"><small><strong>For
Exable:</strong> 5 Switches with 5 Red Leds 3mm in Series.</small></font></td>
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