Schematics > Motor, light and power control > 25 Light Sequencer using Xmas lamps
25 Light Sequencer using Xmas lampsThis circuit is same as the above setup to drive 25 small Xmas lights. The
lights operate at about 200mA and 3 volts. The supply voltage is set to 5 volts
and the 4017 counter output will drop about a volt using the 2N3053 transistors.
The voltage on the emitters of the rows transistors will be about 0.7 volts less
than the base so the lamp voltage will be about 3 volts. You can adjust the
supply voltage for the desired current if necessary. It works the same way as
the LED version but you need diodes in series with each light. Most any small
diode rated at 500mA or more should work. I used 1N4001 diodes. Various NPN
transistors can be used, I tried 2N2219A and 2N3053. The 2N3053 worked out
better with a higher gain than the 2N2219A, but either one should work.
25 Light Sequencer using Xmas lamps circuit
Title: 25 Light Sequencer using Xmas lamps
Source: unknown
Published on: 2007-07-21
Reads: 327
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