![]() C3 is used to double the voltage of this pulse, but it can only do this for a short time. 3V batteries can’t drive them without help, so extra circuitry is required.Īs in the previous circuits, the LED is given a 0.03 second (30ms) pulse. Blue and white LEDs have a higher Vf (forward dropping voltage) than most, around 3.6V. This circuit builds on the previous two experiments, using their features and adding to them. If you do not use protection as described in Volume 3, Chapter 9, ElectroStatic Discharge, you run the risk of destroying it. NOTE! This project uses a static sensitive part, the CMOS 555. How to use a capacitor to double voltage with a switch.How to use transistors to improve current gain.Learn one of several 555 timer Astable Multivibrator Configurations.Learn a practical application for a RC time constant.Lessons In Electric Circuits, Volume 4, chapter 10: “ Multivibrators” Lessons In Electric Circuits, Volume 3, chapter 9 : “ ElectroStatic Discharge” ![]() Lessons In Electric Circuits, Volume 3, chapter 4 : “ Bipolar Junction Transistors” Lessons In Electric Circuits, Volume 1, chapter 16: “ Solving for unknown time” Lessons In Electric Circuits, Volume 1, chapter 16: “ Voltage and current calculations“ C3 - 470 ♟ Electrolytic Capacitor (Radio Shack catalog 272-1030 or equivalent). ![]()
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