Preset Digital BCD Counter

See a Tutor Digital up down BCD counter that will help you take the first step in digital electronics.

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Realted Resources

• The 4029 CMOS Counter IC
• hyperphysics - binary counter
• 7 Segment LED Counter

LED Running lights CD4017

This is a Gadget Tutorial for this Article LED Running lights CD4017.

This Demo shows LM555 running a CD4017 Counter to drive Ten Leds sequentially.

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Related Resources -

• LED (Light Emitting Diodes) Circuits
• White LED Drive Circuit
• Back and Forth Flasher
• Sequential 10-LED Flasher
• Fun with LEDs
• Optoelectronic circuits, LED circuits
• FC's Solar Circuits

Astable Multivibrator with 555

Astable Multivibrator with 555 or Astable 555 Timer Flasher

This is a tutorial with calculator to help learn the application of 555 which is a very rare chip innovation. It is simple, versatile, flexible and programmable (by tweaking of pots).

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If you are starting with electronics, this is the first step. So do it now ! Do-It-Yourself.

• 555 Timer Tutorials
• 555 Timer/Oscillator Tutorial
• 555 Timer Calculator
• 555 and 556 Timer Circuits
• LM555 Timer Circuits

Electronic Random Decision Maker

Running LED, Random Results, Decade Counter and Clock. Weigh the Pros-n-Cons, Take a Balanced Decision.

See Code gadgets-widgets. This can be built with one 555 timer and a CD4017. See Fun with LEDs but use the pin 5 to connect to a cap you charge with a pushbutton or gate like CD4093 to turn off 555 using pin 4 after a cap discharges. This may simulate a random.

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