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Timers and
Counters Circuits, Page 5a Timers & Counters:
#-AB-EF-LM-S Previous T-Z Last Updated on:
Monday, October 03, 2011 06:08 PM
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
Transistor Tester - The 555 operates at 2Hz. Output pin 3 drives
the circuit with a positive then zero voltage. The other end of the circuit
is connected to a voltage divider with the mid-point at approx 4.5v….
Triggering And Timing Helpers For Monostable Timers - 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]
TV Remote Control Jammer - This circuit confuses the infra-red
receiver in a TV. It produces a constant signal that interferes with the
signal from a remote control and prevents the TV detecting a channel-change
or any other command. This allows you to watch your own program
without anyone changing the channel....
Uneven Clicks - This circuit produces two clicks then a short
space before two more clicks etc. Changing the voltage on pin, 5 via the
diode, adjusts the timing of the chip.
Up/Down Fading LED - These two circuits make a LED fade on and off. The
first circuit charges a 100u and the transistor amplifies the current entering the
100u and delivers 100 times this value to the LED….
Using The 555 Timer With Photocells - This page shows three circuits for
using the 555 timer IC as a photocell controlled train detector.
Scroll down for this circuit design…..Circuit for model railroad trains…. [from Rob
Paisley's Model Train web site]
Using The LM555 As A Voltage Comparator Or Schmitt Trigger - 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]
Valentine Heart - 18 LEDs flash at three different rates and you can use
these to create an eye-catching Valentine Heart for that special person! A template
for the heart shape can be downloaded. The circuit is kept simple (and low cost) by
using the 4060B IC which is a counter and oscillator (clock) in one package. The
circuit requires a 9V supply, such as a PP3 battery.... [Designed by John Hewes]
Variable Period Oscillator (CD4017) - 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]
Various 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]
Various Power Control Delay Circuits - 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]
Voltage Controlled Pulse Width Oscillator - 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]
Voltage Doubler - A voltage higher than the supply can be created by a
"Charge-Pump" circuit created with a 555, diodes and capacitors as shown in the
following circuit. The output will deliver about 50mA.
Wailing Siren - By pressing the button, the wailing sound increases.
Releasing the button decreases the wailing. The circuit automatically turns off after
about 30 seconds.
xTimer V1.1 - Easy build 4-channel timer, suitable for energy saving, simple
hardware and nice firmware with c coding. Automatic power down mode, simple settings,
optional buzzer for sound alarm…. [Wichit Sirichote, kswichit@kmitl.ac.th]
