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12v to 240v Inverter - This circuit will produce 240v at 50Hz. The
wattage will depend on the driver transistors and transformer.
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3 Position Servo Driver Circuit (LM555) - This circuit uses an
SPDT toggle switch to select One-of-Three positions for a servo
motor….Scroll down to find this design….Circuit for model railroad trains….
[from Rob Paisley's Model Train web site] |
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5 Times Around Circuit - The 5 Times Around circuit was designed
to automatically let an N Scale locomotive and car travel around a loop 5
times and stop for approximately a minute and then repeat the cycle. [from
Rob Paisley's Model Train web site] |
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50% Output Duty Cycle (Fixed) Using Logic Devices - 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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50% Output Duty Cycle (Variable) - 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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555 Amplifier - The 555 can be used as an amplifier. It operates very
similar to pulse-width modulation. The component values cause the 555 to oscillate at
approx 66kHz and the speaker does not respond to this high frequency. Instead it
responds to the average CD value of the modulated output and demonstrates the concept
of pulse-width modulation. The chip gets very hot and is only for brief
demonstrations. |
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555 Timer Current Draws - 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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555 Timer Output Section - 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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555 VCO - By adjusting the voltage on pin 5, (the CONTROL pin) the frequency
of the oscillator can be adjusted quite considerably. |
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6 Aspect - Searchlight Signal Driver (LM555) - The circuit on this page is a
6 Aspect driver for a bicolour LED type Searchlight Signal. The available signal
indications are; SOLID - RED, YELLOW, GREEN, and FLASHING - RED, YELLOW and GREEN. The
circuit can also turn the signal OFF for approach lighting if desired. [from Rob
Paisley's Model Train web site] |
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Active High Trigger - This circuit produces a HIGH output via a HIGH
trigger: |
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Active Low Trigger - This circuit sits LOW and the output goes HIGH when the
push-button is pressed. When the normally-closed push button is pressed, it opens and
the uncharged 1u will be pulled to nearly 0v rail via the 10k and this will take pin 2
LOW to make output pin 3 HIGH for the duration determined by the 22u and 100k. If the
push-switch stays open, the 1u will charge via the 100k and eventually the output of
the 555 will go low.... |
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Adjustable Timer - This circuit starts timing when switched on. A green LED
lights to show that timing is in progress. When the time period is over the green LED
turns off, a red LED turns on and a bleeper sounds. The time period is set by a
variable resistor and it can be adjusted from 1 to 10 minutes (approximately). It
could be used to set a time limit when playing games or as an egg-timer in the
kitchen.... [Designed by John Hewes] |
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Advanced Circuits For The LM555 Timer - 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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Astable Multivibrator - The capacitor C charges via R1 and R2 and when the
voltage on the capacitor reaches 2/3 of the supply, pin 6 detects this and pin 7
connects to 0v. The capacitor discharges through R2 until its voltage is 1/3 of the
supply and pin 2 detects this and turns off pin 7 to repeat the cycle.... |
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Automatic Curtain Closer - This circuit uses a mixture of transistors, an IC
and a relay and is used to automatically open and close a pair of curtains. Using
switch S3 also allows manual control, allowing curtains to be left only partially open
or closed. The circuit controls a motor that is attached to a simple pulley mechanism,
to move the curtains.... |
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Average 51.5 % Output Duty Cycle Using A 555 Timer - 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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