Morse Buzzer Alarm or Continuity Tester by IC 4011

Monday, November 24th, 2008
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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 [...]

Burglar Alarm model the circuit closes

Monday, November 17th, 2008
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This circuit works with battery 9V a piece is very small. For the work happens independently don’t be under house electricity. The circuit will make a noise to warn work as soon as , detect which be switch model usual close the circuit or aluminium , eliminated separate.

UM66T IC MELODY INTEGRATED CIRCUIT

Sunday, November 16th, 2008
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In the circuit basically usability base IC UM66T use sound of music sweet-sounding origin and be usable easily. It use just integrated one circuit and a loudspeaker , Piezo-Buzzer , the small-sized , and have power supply 3V only. The detail is other of integrated number this circuit.
The UM66T [...]