Flashing LEDs
Powering a flashing LED from this circuit. Flashing LEDs have two undesirable traits; They change the drive current when 'off', and do not like the supply voltage falling to zero during cycle change over. In the circuit below, two components are added to cater for this difference; There is a smoothing cap to help keep the supply voltage above zero while the supply current changes phase, and a zener to help regulate the output voltage while the LED is off and drawing very little current. The above values were successfully used on more than one occasion.
No comments:
Post a Comment