I tried to modify existing circuit by adding a stereo potensiometer so that the duration of blinking LED could be adjust. I use 100 K ohm potensiometer to adjust duration and 10 K Ohm that useful as limit base of each transistor.
Potensiometer and resistor 10 K Ohm use to substitute resistor 56 K Ohm.
So, you can watch this video and dont forget to leave your comment, Thanks......
I was buy some circuits PCB not only LED circuits but also Siren Circuits.
Siren is like alarm which scream tone. In my country, siren often use in firefighter
car otherwise launch time alarm for worker in the industrial factory . This is
PCB that I was buy.
After open plastic package, I got this pieces of paper and PCB of course .
And It was i assemble like this
After that i use Push Button Switch according schematic paper. Push Button Switch use to start and stop siren buzzing. When position start ( Push Button Pushed ), The Siren sound is longer then higher tone. When position stop ( Push Button Release), The Siren sound is longer then lower tone until silent. This is it.
You can look this picture to overall wiring, I use 8 Ohm, 0.5 Watt mini speaker 2.5 Inch. On the schematic paper describe that circuits work at 6 Volt. But i prefer to use 9 Volt Battery.
And you can watch this Video. This circuits is simple to make and soldering.
LED Flip Flop is one of many circuits have I made when I
start to learn about electronics circuits. In years of 2002 i often to
assembling some circuits with PCB. Of course many PCB sold on the electronics
part store at that time and until now. I like to assembling several LED
circuits because all of them can blink with very beautiful.
Yesterday, I visited at electronics part store which old
shopkeepers on my city. In the store, I looked from left to right. I admired
because he still kept very old component and circuits PCB. How old this part
can be seen from price on the package. I'm sure that is old price.
I bought some PCB, one of them is LED Flip Flop, you can
look at this photo.
If i bought PCB Saturn product that well known merk, I
always got a paper pieces that describe schematic of PCB like this.
Finally, I was assemble this, and I’m so happy because not
for success to assemble but I can remember while sit in the Technical High
School from 2002 to 2005.
And you can watch this Video. This circuits is simple to
make and soldering.
