Arduino Forum

Using Arduino => General Electronics => Topic started by: KatjaD on Jun 04, 2013, 12:44 am

Title: possible short circuit in schematic design?
Post by: KatjaD on Jun 04, 2013, 12:44 am
at point A.. the output.. i get 001 at 2000m V on my multimeter. at point B i'm getting about 14v. something is obviously wrong. and the batteries are heating up. no wires are touching.. is it possible a switch is bad or somthing?

Title: Re: possible short circuit in schematic design?
Post by: DVDdoug on Jun 04, 2013, 01:05 am
Quote
at point A.. the output.. i get 001 at 2000m V on my multimeter.
What is "001"?   

If I understand the circuit correctly you have an open circuit when nothing is connected to the piezos.   2000mv (2V) could be normal.   And, you can't reliably measure PWM with a digital multimeter.

Quote
at point B i'm getting about 14v.
That's a little low for two 9V batteries.   Try breaking the circuit and measuring the current.

Also, make sure that C5 is not reversed.

Is the IC in a socket?   If so, try removing it to see if the voltage goes up, and the current goes to zero.
Title: Re: possible short circuit in schematic design?
Post by: CrossRoads on Jun 04, 2013, 02:14 am
You're still working this circuit?
What did you resolve for the last issue on this circuit?