battery in series with digital out OK?

Forum 2005-2010 (read only) Hardware Interfacing
1

Is it ok to put a 9V battery in series with my digital out so that I get 5V + 9V = 14V?

Is this a reasonable way to PWM control an 0-10V analog voltmeter? Its way more simple than a boost converter circuit.

Thanks!
-JFM

2

No,
won't work.

That's why there are such things as boost converter circuits....
Eberhard

3

Most analog meters have an internal resistor that determines its sensitivity. If you can open the meter and locate the resistor, you may be able to replace it with one for a range of 0-5 volts. There are many sources of information on how to do this, for example: http://ka1kjz.com/?p=430

4

Not only will this not work it will permanently damage your arduino.
To boos the output you need a transistor or FET.