Alternate Flashing Light Flip-Flop Choccy Block Terminal Strip Kit of Electronic Parts

This is a kit of electronic parts for a transistor light flashing circuit which alternately flashes two sets of LEDs or lamps. It is built entirely without soldering using a 12-way 3A terminal strip. This is somewhat better than the simpler versions available elsewhere, in that it has two additional output driver transistors. This allows you to flash more than two little LEDs, or use proper lamps.

All the build information is provided online so that easy updates can be added. The build information is full and detailed, and there's a full electronic explanation provided with oscilloscope screen-shots. Three different resistor values are provided for different flashing rates. If you're looking for a school science project which you can knock-up in a hurry, then look no further.

The fully detailed instructions are available here:

https://www.usefulcomponents.com/main_contents/projects/flip_flop_1/flip_flop_1.html

This is the Bill Of Materials:

Flashing Light Flip-Flop 1 Bill Of Materials

Electronic Parts Included in the Kit

Qty Refs Type Value

2 R1,R2 Resistor 4.7K 0.5W
2 R3,R4 Resistor 68K 0.5W, alt values 47K and 100K
2 R5,R6 Resistor 470R 0.5W
2 C1,C2 Capacitor 10uF NP
2 Q1,Q2 Transistor BC549C
2 Q3,Q4 Transistor BD140-16

Miscellaneous

1 12-way 3A Terminal Strip
1 4 X AA Battery Holder
2 2 X M.E.S. lampholder
2 2 X 6V 0.1A lamps
1 D1 red wired LED with resistor
1 D2 green wired LED with resistor
0.5 100mm black single core wire
1 100mm red single core wire
4 100mm orange single core wire

In addition you will need four AA batteries, a small screwdriver, some wire cutters, small pliers, and some means of stripping the insulation from the wire in addition to the above.