DriverX
Newbie level 3
Hey guys,
Not sure if this is the correct section for this, but feel free to move it if it's not.
So, I'm having a little trouble with controlling a relay using a 555 timer connected in monostable (one-shot) mode. Basically, I have everything hooked up just like in the schematic below, except:
1) I'm using a 10k pull-up resistor, instead of 2k (in the left corner)
2) I'm using 100k resistor and 10uf cap, instead of 47k and 22uf
3) I omitted the 2k resistor between the 47k resistor and 22uf cap
4) I'm using a 0.01uf cap, instead of 0.1uf, to go from pin 5 to ground
5) Both diodes are 1N4004
6) It's powered by 4 1.5V batteries connected in series (6V)
Now, the circuit works (I think...), but it's not consistent. For example: I connect the power, hit the momentary switch, and the relay clicks and un-clicks like it should (in approximately a second, so that's fine), then I hit the switch again, nothing happens, hit the switch for the third time, relay acts just like the first time, hit the switch for the fourth time, nothing happens, hit it for the fifth time, works just like the 1st and 3rd time, etc etc.
What should I do to make the relay respond the same way every time I press the momentary switch? Are the resistor and capacitor values that I'm using fine? Is there a better way to achieve the same task?
Here is the schematic:
**broken link removed**
Any advice would be greatly appreciated.
Thanks,
Adam.
Not sure if this is the correct section for this, but feel free to move it if it's not.
So, I'm having a little trouble with controlling a relay using a 555 timer connected in monostable (one-shot) mode. Basically, I have everything hooked up just like in the schematic below, except:
1) I'm using a 10k pull-up resistor, instead of 2k (in the left corner)
2) I'm using 100k resistor and 10uf cap, instead of 47k and 22uf
3) I omitted the 2k resistor between the 47k resistor and 22uf cap
4) I'm using a 0.01uf cap, instead of 0.1uf, to go from pin 5 to ground
5) Both diodes are 1N4004
6) It's powered by 4 1.5V batteries connected in series (6V)
Now, the circuit works (I think...), but it's not consistent. For example: I connect the power, hit the momentary switch, and the relay clicks and un-clicks like it should (in approximately a second, so that's fine), then I hit the switch again, nothing happens, hit the switch for the third time, relay acts just like the first time, hit the switch for the fourth time, nothing happens, hit it for the fifth time, works just like the 1st and 3rd time, etc etc.
What should I do to make the relay respond the same way every time I press the momentary switch? Are the resistor and capacitor values that I'm using fine? Is there a better way to achieve the same task?
Here is the schematic:
**broken link removed**
Any advice would be greatly appreciated.
Thanks,
Adam.