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Laser Ray Sound - This circuit produces a weird "Laser Ray" sound
and flashes a white LED at approx 5Hz: |
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Latch - This circuit is a LATCH and remains ACTIVE when the
push-button has been pressed for an INSTANT and released. |
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LED Dice - This circuit produces a random number from 1 to 6 on
LEDs that are similar to the pips on the side of a dice. When the two TOUCH
WIRES are touched with a finger, the LEDs flash very quickly and when the
finger is removed, they gradually slow down and come to a stop.
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LED Dimmer - This circuit will adjust the brightness of one or
more LEDs from 5% to 95%. |
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Light Detector - This circuit detects light falling on the
Photo-cell (Light Dependent Resistor) to turn on the 555 and create a tone
that is delivered to the speaker. Pin 4 must be held below 0.7v to turn the
555 off. Any voltage above 0.7v will activate the circuit. The adjustable
sensitivity control is needed.... |
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Light-Sensitive Alarm - The circuit detects a sudden shadow falling on a
light-sensor and sounds a bleeper for a short time (adjustable). Normal lighting can
be used, but the circuit will work best if a beam of light is arranged to fall on the
light-sensor. Breaking this beam will then cause the bleeper to sound.... [Designed by
John Hewes] |
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LM555 - Astable Oscillator Calculator + Capacitor Calculator - Uses the
LM555 timer or its cousins with other letter prefixes. There can be minor differences
between 555 timer IC's from different manufacturers but they all should be useable for
any circuit. Designed for Model Trains…. [from Rob Paisley's Model Train
web site] |
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LM555 - Monostable Oscillator Calculator - Uses the LM555 timer or its
cousins with other letter prefixes. There can be minor differences between 555 timer
IC's from different manufacturers but they all should be useable for any circuit.
Designed for Model Trains…. [from Rob Paisley's Model Train web site] |
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LM555 LED Blinker Circuits - The circuit uses independent timers to flash
two light emitting diodes. Any time that light emitting diode D1 is lit__light
emitting diode D2 will be switched off. Light emitting diode D3 is on if both D1 and
D2 are off....Circuit for model railroad trains…. [from Rob Paisley's Model Train web
site] |
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LM555 Timers - Circuits and Calculators - Circuit for model railroad
trains…. [from Rob Paisley's Model Train web site] |
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LM556 Timers with Complimentary or Push-Pull Outputs - Uses the LM555 timer
or its cousins with other letter prefixes. There can be minor differences between 555
timer IC's from different manufacturers but they all should be useable for any
circuit. Designed for Model Trains…. [from Rob Paisley's Model Train web
site] |
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Low Frequency 555 Oscillator - If the capacitor is replaced with an
electrolytic, the frequency of oscillation will reduce. When the frequency is less
than 1Hz, the oscillator circuit is called a timer or "delay circuit." The 555 will
produce delays as long as 30 minutes but with long delays, the timing is not accurate.
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Low frequency clock - Schematic only, no circuit description |
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