Morse Buzzer Alarm or Continuity Tester by IC 4011
This circuit uses the integrated circuit CMOS number IC 4011 pretend Square Wave Oscillator , which touch buffer change output (which compose Complementary pair of transistors) for a loudspeaker next by bass keen in the sound can control with potentiometer or 10 K ohm when we wasp the circuit suits power supply as a result , be , sound generator get , and in other words we can use to are Continuity Tester by use probe 2 reach instead of itch knock the password there. In addition Input pin , that still no use of , gate CMOS every a pin join with negative supply for feed prevent all noise.
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Easy sound Generator high power By TC4011
Origin sound circuit or sound Generator model this to receive design give can go out 10watt with full speed from ahead power supply 15volt. Besides still sound origin periodically as well. Which if lead this circuit goes to assemble with the circuit steal already it will give the sound that attracts more than loud ordinary sound. The work of the circuit use switch S1 be formed control. Integrated circuit IC1 at use the number TC4011 , which assemble be Nand Gate 2 input 4pcs. The detail is other , see in circuit picture yes.
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Time Delay Relay II by IC 4011
When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. The current capacity of the circuit is only limited by what kind of relay you decide to use.
Source:http://www.aaroncake.net/circuits/relaytim2.htm
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