Hello all,
For my current project that I am working on, I am in need of a ramping triangular wave voltage signal. This signal is to be pretty symmetrical, sweep between +/- 2 V at a frequency around 0.01 Hz - 1 Hz, very slow.
Ideally, I would like to use a single coin cell battery to power this signal. Is there a simple way to split say a 5 V battery into two +/- 2.5 V supplies?
Here is the standard circuit that I am using to build the wave:
I understand that the frequency can be found as:
\(f = \frac{1}{4R_{t}C}(\frac{R_{2}}{R_{1}})\)
Not sure, but is:
\(Vamp_{+} = (\frac{R_{1}}{R_{2}})V_{ss}\)
\(Vamp_{-} = (\frac{R_{1}}{R_{2}})V_{ee}\)
I ran some tests and found that when I used ceramic disk capacitors they held by the equation above, but when I used tantalum, their apparent capacitance was around 10 times greater than their marked value.
So I guess my main questions are:
1. For the peak voltages (+/- 2 V) that are desired, what value of supply should I be thinking of using?
2. Once I obtain said supply, how can I split it into Vss and Vee?
Thanks,
JP
For my current project that I am working on, I am in need of a ramping triangular wave voltage signal. This signal is to be pretty symmetrical, sweep between +/- 2 V at a frequency around 0.01 Hz - 1 Hz, very slow.
Ideally, I would like to use a single coin cell battery to power this signal. Is there a simple way to split say a 5 V battery into two +/- 2.5 V supplies?
Here is the standard circuit that I am using to build the wave:
I understand that the frequency can be found as:
\(f = \frac{1}{4R_{t}C}(\frac{R_{2}}{R_{1}})\)
Not sure, but is:
\(Vamp_{+} = (\frac{R_{1}}{R_{2}})V_{ss}\)
\(Vamp_{-} = (\frac{R_{1}}{R_{2}})V_{ee}\)
I ran some tests and found that when I used ceramic disk capacitors they held by the equation above, but when I used tantalum, their apparent capacitance was around 10 times greater than their marked value.
So I guess my main questions are:
1. For the peak voltages (+/- 2 V) that are desired, what value of supply should I be thinking of using?
2. Once I obtain said supply, how can I split it into Vss and Vee?
Thanks,
JP
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