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Topic: possible short circuit in schematic design? (Read 614 times) previous topic - next topic

KatjaD

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?

DVDdoug

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.

CrossRoads

You're still working this circuit?
What did you resolve for the last issue on this circuit?
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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