Digital

The LM555 timer can achieve a 50 percent duty cycle as shown in the next diagram. The duty cycle adjustment range of the give components values is from 42 to 55 percent.
Resistors R1 and R2 were selected first and then resistor R3 was selected to give the best control range based on [...]

If you repair switch-mode power supplies, TV receivers, computer monitors, vintage radios, or similar equipment, and/or if you need to measure very low values of resistance, this project can save you lots of time and aggravation - as it has for me. It measures an aspect of electrolytic capacitor performance which is very important, but [...]

You dont have to throw it, just shake it, and it acts just like regular dice! It rolls out slowly and flashes the last combination or winning number! Microprocessor controlled circuit is fun to learn. Runs on one 3V Lithium button cell
Read more LED Shaking Electronic Dice Kit