user47647: Sorry in advance if this question already exists--I tried to search but my keyword knowledge is shaky. I have created a Colpitts oscillator on breadboard using AA batteries as the power supplies. I want to implement this oscillator with an Arduino. (Once it's set up, I want to use its voltage to do some things, but that isn't part of this question.)
In the image below, I have two voltages, Vcc (positive voltage) and Vee (negative voltage). My simulations indicate I can run the oscillator either with a dual voltage (+5V and -5V), or with one negative voltage (-5V) and the other set to ground. Either provides a 100 kHz oscillation from about -5 to 2 V. So:

Is there a way to provide a dual voltage supply from the Arduino Uno? 
Is there a way to provide a single negative voltage supply from the Arduino Uno?

Thanks!


user31105: You can make -5 V if you use an external power source, like in the circuit below (untested).
Connect the GND (-) from the Arduino to the +5V from the External (5V) source, than 0V will be the GND (with respect to the Arduino), but the GND of the external source will be -5V with respect to the Arduino.
I only used the resistors to get no short circuits, you can replace it by your own circuit (connecting the 5V arrow to Vcc and the -5V arrow to Vee).

simulate this circuit – Schematic created using CircuitLab

47647: <p>Sorry in advance if this question already exists--I tried to search but my keyword knowledge is shaky. I have created a Colpitts oscillator on breadboard using AA batteries as the power supplies. I want to implement this oscillator with an Arduino. (Once it's set up, I want to use its voltage to do some things, but that isn't part of this question.)</p>

<p>In the image below, I have two voltages, Vcc (positive voltage) and Vee (negative voltage). My simulations indicate I can run the oscillator either with a dual voltage (+5V and -5V), or with one negative voltage (-5V) and the other set to ground. Either provides a 100 kHz oscillation from about -5 to 2 V. So:</p>

<ul>
<li>Is there a way to provide a dual voltage supply from the Arduino Uno? </li>
<li>Is there a way to provide a single negative voltage supply from the Arduino Uno?</li>
</ul>

<p>Thanks!</p>

<p><a href="https://i.stack.imgur.com/9EAde.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9EAde.png" alt="Colpitts oscillator. According to simulations, I can set Vcc=0 and Vee=-5 and still observe oscillations"></a></p>
 31105: <p>You can make -5 V if you use an external power source, like in the circuit below (untested).</p>

<p>Connect the GND (-) from the Arduino to the +5V from the External (5V) source, than 0V will be the GND (with respect to the Arduino), but the GND of the external source will be -5V with respect to the Arduino.</p>

<p>I only used the resistors to get no short circuits, you can replace it by your own circuit (connecting the 5V arrow to Vcc and the -5V arrow to Vee).</p>



<p><img src="https://i.stack.imgur.com/g7ZOB.png" alt="schematic"></p>



<p><sup><a href="/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fg7ZOB.png">simulate this circuit</a> &ndash; Schematic created using <a href="https://www.circuitlab.com/" rel="nofollow">CircuitLab</a></sup></p>
