Constant (peak) current sine generator
Constant (peak) current sine generator
(OP)
Hello,
I would like to hear your suggestions for a circuit to produce a sine wave the has a constant peak current. The frequency would be around 1 Hz, and the positive peak current would be ~ 25 mA (Peak to peak would be ~ 50 mA). The load resistance is not constant.
My first shot at it was to use a DAQ card to produce the sine wave at a given voltage and then I monitored the current with a shunt and then adjusted the peak voltage. It worked pretty well, but I would like a hardware solution.
I would like to hear your suggestions for a circuit to produce a sine wave the has a constant peak current. The frequency would be around 1 Hz, and the positive peak current would be ~ 25 mA (Peak to peak would be ~ 50 mA). The load resistance is not constant.
My first shot at it was to use a DAQ card to produce the sine wave at a given voltage and then I monitored the current with a shunt and then adjusted the peak voltage. It worked pretty well, but I would like a hardware solution.





RE: Constant (peak) current sine generator
I Googled: 'sine wave oscillator lamp' ("lamp" being the magic keyword), and found this very good example:
http://www.bobsdata.com/audio_sine_wave_generator/
You'd need to adapt the output to match your exact requirements.
RE: Constant (peak) current sine generator
One other thing you'll have to deal with is the voltage compliance, most op amps like +/- 15 volts maximum, though you can get some that can handle several hundred volts. What is your load impedance?
RE: Constant (peak) current sine generator
RE: Constant (peak) current sine generator
In addition to that, you need a voltage controlled current source, something like this:
http://w
Mike Halloran
Pembroke Pines, FL, USA
RE: Constant (peak) current sine generator