Matek666

modified 7 years ago

RedGreen LED Flasher

175

01:44:12

Short Circuits Project 1

published 7 years ago

Matek666

7 years ago

I am totally new to this.. Trying to draw circuit diagram for "Short Circuits" project 1 before I build the kit. I think I have the wiring correct except capacitor should be 4.7uF RBLL electrolytic and diode should be 1N4004, are there specific parts? Not sure why current is not going around the circuit correctly. Any tips appreciated.

Robert_Kidd

7 years ago

Main problem here is that there is no connection between 555 ground pin and the actual ground. The wires do cross but are not connected.

Robert_Kidd

7 years ago

Also, if you adjust timebase to (say) 1 second it will flash more obviously.

Robert_Kidd

7 years ago

The diode at top right doesn’t serve any purpose and just means the 555 is getting 0.7V less voltage.

Matek666

7 years ago

Thanks Robert. I have fixed the ground. The top right diode is the one that is 1n4004 in the kit. Not sure where timebase is. Any idea why the current is not going through both LED's? I am definitely missing something

Matek666

7 years ago

If I change the 100k resistor to 1k it works. I'll build the kit tomorrow and see how it goes.

Robert_Kidd

7 years ago

In EveryCircuit you cannot choose diode types (1N4001, 1N914 etc.) but you do have control over some of the parameters of the diode. To see these touch diode of interest to highlight it, then touch spanner icon and a menu will appear for the diode parameters you have control over. Touch the parameter you wish to adjust then use the ‘wheel’ to choose the value you want. This works with all component types.

Robert_Kidd

7 years ago

The timebase is the clock icon.

Robert_Kidd

7 years ago

The current isn’t going through both LED’s at the same time because they will flash alternately. If you change the timebase as discussed the flashing rate will allow you to see alternate flashing and current flow will be through both, but not at the same time.

Robert_Kidd

7 years ago

Finally, both your LED’s are green. If you select one of them, then touch spanner icon you will be able to change the LED colour.

Robert_Kidd

7 years ago

If you change the LED resistors from 1k to 360 Ohms the LED’s will be brighter. We usually set LED current to 20mA in this simulator.

Robert_Kidd

7 years ago

Any problems just ask. It takes a while to get used to.

wyoelk

7 years ago

Nice job helping @Robert_Kidd

Robert_Kidd

7 years ago

@wyoelk, thanks for your kind comment. Much appreciated.

Matek666

7 years ago

@Robert_Kidd, Thanks so much for your help. I am beginning to understand. Just finished building the kit and it worked.

wyoelk

7 years ago

@Matek666. You might look through the Example section for more ideas on how the app works

Robert_Kidd

7 years ago

@Matek666, you are most welcome.

Matek666

7 years ago

@wyoelk Thanks, looking at examples now.

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