View previous topic :: View next topic |
Author |
Message |
Miriax Newbie
Joined: 28 Dec 2008 Posts: 1
|
Posted: Sun Dec 28, 2008 4:39 pm Post subject: Morse pulse generator based on Monostable 555 circuit |
|
|
I drew inspiration for this project from this topic and this site.
This is my circuit diagram:
The pulse length varies as T = 1.1 × R1 × C1.
T = time period in seconds (s)
R1 = resistance in ohms
C1 = capacitance in farads (F)
I'm going for approximately a 0.125s cycle, probably less, so .125 ~> 1.1(20000)(0.0000047). I'll be using a 15k resistor with a 0-5k pot. I'm also allowing +/-20% because the 4.7uF capacitor is electrolytic.
I'm just starting out in electronics, but can anyone tell me if this circuit will do what I think it will? I want it to send a brief, timed pulse every time the key (trigger) is depressed. I think I've got the timing down, but who knows? I may not have the battery wired correctly.
Thanks, and I'll let everyone know how the circuit works once I put it together.
Miriax |
|
Back to top |
|
 |
|
 |
Alexander125 HG Master

Joined: 13 Jan 2009 Posts: 105 Location: Galati, Romania
|
Posted: Fri Feb 06, 2009 12:45 pm Post subject: |
|
|
from what i knew the 7 and 6 pins should be hooked up to eachother. |
|
Back to top |
|
 |
Alexander125 HG Master

Joined: 13 Jan 2009 Posts: 105 Location: Galati, Romania
|
Posted: Tue Apr 14, 2009 12:06 pm Post subject: |
|
|
the batery is wired wright.
Does it work properly now?? |
|
Back to top |
|
 |
|