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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.



Digital Electronics Tutors

• Astable 555 Timer Flasher - 555 Blinks Two LED Lamps, Vary Part Values.
  
• LED Running lights CD4017 - Speed up a 555 Clock driving a LED Chain.
  
• Digital up down BCD counter - Flip-Flop, Binary Numbers, Logic Demo.
  
• Digital Logic Gates - Logic Gates with LED Lamps and Pushbutton Switches.

Analog Electronics Tutorials

• Buffer Unity Gain Amp - OpAmp that will match impedance, but does not amplify. 
  
• Inverting Opamp - Operational Amplifier for Amplification but Polarity is Swapped.
  
• Non-Inverting Opamp - Normal Amplifier with no polarity change. High Impedance.
  
• Differential Amplifier - Amplifies the difference between two points/nodes, classic.
  
• Dual Differential Amp - High input z, Just two opamps, magnifies the difference.
  
• Instrumentation Amp - An ideal amp, three opamps and diff-amp with gain control.
• Virtual Oscilloscope - Waveform display, Fourier Series Periodic Waveforms.