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MISC
SKILLS
HARDWARE
SCIENCE |
(USING MAX232 IC)
Why a negative voltage?
What is a negative voltage?
Using a battery as a voltage source, if the negative terminal of the battery is connected to 'common' then the voltages in the circuit will all measure positive from that point of reference. If the positive terminal of the battery is connected to 'common' then the voltages in that circuit will all measure negative with reference to the 'common' point. To an engineer, setting this point of 'commanality' in a circuit sets a point of reference for all other voltage measurements. This simplifies the description of electron flow in a circuit.
Creating a Negative Voltage
But for practical purposes, it is not always feasible to add extra power sources and/or batteries to create a negative voltage for your application, and so there is a much better option.
The MAX232 IC
On the IC, use the 'negative output supply voltage Vs-' pin (pin 6 shown below) for up to negative 15V and up to 10mA of current. 10mA isnt enough? Stack multiple MAX232 IC's in parallel for increased current capabilities.
![]() MAX232 PinOut
Negative Voltage Regulators
Other Methods to get Negative Voltages
http://www.societyofrobots.com/robotforum/index.php?topic=2734.0 |
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