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		<title><![CDATA[Circuit Finder - Lock]]></title>
		<link>http://www.circuit-finder.com/categoriesalarms-and-securitylock/page-1</link>
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		<copyright><![CDATA[Copyright © 2026., Circuit Finder - circuit diagrams database ]]></copyright>
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		<pubDate>Fri, 06 Mar 2026 11:56:59 +0000</pubDate>
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		<category><![CDATA[Lock]]></category>	
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			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/214/a-4-digit-keypad-controlled-switch</guid>
			<title><![CDATA[A 4-Digit Keypad Controlled Switch]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/214/a-4-digit-keypad-controlled-switch</link>
			<description><![CDATA[This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I've used a SPCO/SPDT relay - but you can use a multi-pole relay if you wish.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 03 Aug 2010 16:57:08 +0000</pubDate>
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		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/215/keypad-controlled-switch-no-2</guid>
			<title><![CDATA[Keypad Controlled Switch No. 2]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/215/keypad-controlled-switch-no-2</link>
			<description><![CDATA[This is a simplified version of the 4-Digit Keypad Controlled Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of situations where it will still be adequate.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 03 Aug 2010 16:41:52 +0000</pubDate>
		</item>
				
				
		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/217/electronic-door-release</guid>
			<title><![CDATA[Electronic Door Release]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/217/electronic-door-release</link>
			<description><![CDATA[This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. When you enter the four-digit code of your choice - the relay will energize for a preset time period. Use the relay contacts to power the release mechanism. The standby current is virtually zero - so battery power is a realistic option.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 03 Aug 2010 16:22:37 +0000</pubDate>
		</item>
				
				
		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/381/security-door-electronic-key</guid>
			<title><![CDATA[Security Door electronic Key]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/381/security-door-electronic-key</link>
			<description><![CDATA[It is a relatively simple circuit of electronic lock of safety with code of 7 digits. It should is given attention in the time that will be stepped the keys, that shape code and it does not exist it delays. With the right step of keys and if code is right then is activated exit Q7 for roughly 4 seconds, driving the transistor Q2, which with the line can drive one relay, for the opening of door, or any other circuit. With LED D we can have optical clue of activation. The code of circuit, as it has been given have been:1704570 but can change, if we change the connections between in the exits of IC1 and the switches.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 03 Aug 2010 16:15:56 +0000</pubDate>
		</item>
				
				
		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/382/electronic-security-door-key</guid>
			<title><![CDATA[Electronic Security Door Key]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/382/electronic-security-door-key</link>
			<description><![CDATA[A different circuit of electronic lock very simple, one and does not need a lot of materials in order to it is manufactured.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 03 Aug 2010 16:11:53 +0000</pubDate>
		</item>
				
				
		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/535/digital-electronic-lock</guid>
			<title><![CDATA[Digital Electronic Lock]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/535/digital-electronic-lock</link>
			<description><![CDATA[The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys are depressed in the correct order, the counter will advance.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 03 Aug 2010 16:06:48 +0000</pubDate>
		</item>
				
				
		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/page-1#p_140</guid>
			<title><![CDATA[iButton electronic lock]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/page-1#p_140</link>
			<description><![CDATA[This electronic lock can be used with any type of iButtons you may already have, since the only thing needed is the internal serial number, that's different for every iButton.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 22 Jun 2010 21:09:05 +0000</pubDate>
		</item>
				
				
		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/page-1#p_105</guid>
			<title><![CDATA[Electronic Locker]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/page-1#p_105</link>
			<description><![CDATA[This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker.]]></description>
			<category>Lock</category>
			<pubDate>Tue, 22 Jun 2010 20:38:37 +0000</pubDate>
		</item>
				
				
		<item>
			<guid>http://www.circuit-finder.com/categories/alarms-and-security/lock/page-1#p_216</guid>
			<title><![CDATA[Keypad Circuit - With Parallel Code Entry]]></title>
			<link>http://www.circuit-finder.com/categories/alarms-and-security/lock/page-1#p_216</link>
			<description><![CDATA[This is a universal four-digit keypad-operated switch - with a difference. Instead of entering the security code one number at a time - the four keypad buttons must be pressed simultaneously. Split the code between two separately located keypads - and two people will have to be present in order to operate the switch. Each person can have a different three-digit code.]]></description>
			<category>Lock</category>
			<pubDate>Sun, 11 Apr 2010 06:02:57 +0000</pubDate>
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