Technology
Two transistor LED flasher

2Qflash
Tony writes – “This circuit will flash a bright or high-brightness red LED (5000+ mcd). Good for fake car alarm or other attention getting device. Component values are not critical, try anything else first from your junkbox.”Link.

8 thoughts on “Two transistor LED flasher

  1. Cool man. This works great. I added a switch and made the capacitance even smaller by adding them in series. I have a cool blue (5900mcd) LED flasher in my room now. Now anyone know how to add another LED and make it alternate with this guy?

  2. “Component values are not critical” – but, doesn’t the RC constant (R2? and C1) determine the period of the flashing?

  3. “Component values are not critical” – but, doesn’t the RC constant (R2? and C1) determine the period of the flashing?

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