roydm
Industrial
- Jan 29, 2008
- 1,052
Hi,
I'm trying to design a simple delay circuit for a Peizo Electric buzzer to be used on a 24 VDC vehicle, I bought 30 of these LM211-N Comparators thinking they would be up to the task.
On the data sheet it says the output is good for 50 mA but I don't seem to be able to get it to pull up more than 0.06 mA,
It won't pull down from the positive rail at all what am I doing wrong?
I also want to be able to get the delay to around 2 seconds, my RC theory is all gone, cam someone tell me what value of resistor to use with a 1 microfarad capacitor.
I figure the input impedance of the LM211 is very high
Sorry, having trouble getting the sketch on here.
Thanks a lot
Roy
I'm trying to design a simple delay circuit for a Peizo Electric buzzer to be used on a 24 VDC vehicle, I bought 30 of these LM211-N Comparators thinking they would be up to the task.
On the data sheet it says the output is good for 50 mA but I don't seem to be able to get it to pull up more than 0.06 mA,
It won't pull down from the positive rail at all what am I doing wrong?
I also want to be able to get the delay to around 2 seconds, my RC theory is all gone, cam someone tell me what value of resistor to use with a 1 microfarad capacitor.
I figure the input impedance of the LM211 is very high
Sorry, having trouble getting the sketch on here.
Thanks a lot
Roy