This is a novel flasher circuit using a single driver transistor that takes
its flash-rate from a flashing LED. The flasher in the photo is 3mm.
An ordinary LED will not work. The flash rate cannot be altered by
the brightness of the high-bright white LED can be adjusted by
altering the 1k resistor across the 100u electrolytic to 4k7 or 10k.
The 1k resistor discharges the 100u so that when the transistor turns
on, the charging current into the 100u illuminates the white LED.
If a 10k discharge resistor is used, the 100u is not fully discharged
and the LED does not flash as bright. All the parts in the photo are
in the same places as in the circuit diagram to make it easy to see
how the parts are connected.
Download |
No comments:
Post a Comment