[SOLVED] Help needed to pure sin wave Osliator @ 1KHz

[nima_1981]

Hi My friends
i need pure sin wave that Fixed at 1khz But we have two limitation
1- i need 500 mA Current
2- i Can not use transistor for that current because in some of method that transistor going to hot .

power supply is 12Vdc
amplitude near 5 V

Thanks

 

[Audioguru]

The amplitude of a sinewave is usually measured in RMS but a 5V RMS signal is 14.14V peak-to-peak which might not be allowed in your assignment.
Therefore I assume the signal is 5V peak-to-peak which is 1.77V RMS.

Many little audio power amplifiers can be powered from 12V and produce an output of up to 9V p-p at 500mA.

 

[c_mitra]

The amplitude of a sinewave is usually measured in RMS but a 5V RMS signal is 14.14V peak-to-peak which might not be allowed in your assignment.
.

The factor A in A*sin(omega*t) is called the amplitude; this is the peak value measured from zero. The same term is used for cosine waves. If there is a DC offset present, the amplitude is measured from the centre of the sine curve (i.e., 0.1 is still the amplitude in 0.1*sin(t)+100) - that is also called the modulation amplitude.

 

[D.A.(Tony)Stewart]

Hi My friends
i need pure sin wave that Fixed at 1khz But we have two limitation
1- i need 500 mA Current
2- i Can not use transistor for that current because in some of method that transistor going to hot .

power supply is 12Vdc
amplitude near 5 V

Thanks

Your question suggests you have tried this and the device was too hot. So you want a 1KHz low distortion sine wave 5V p or pp and into maybe a 10 Ohm load for 0.5A p or pp? Is that right?

Options;
1) choose a heatsink or specify max power loss and load or efficiency
2) choose a class D complementary MOS switched output with PWM and LC LPF
3) specify Zout, , load regulation or source impedance
4) use a split supply and Class AB audio amp or single supply AC coupled.
5) many more options

 

[KlausST]

Hi,

You say "pure" sine. Please define "pure" in value of distortion.
(Do you need very clean sine signal - for audio measurements, for example? Or is 20%THD pure enough?)

Amplitude "near" 5V means that the amplitude value is not critical?

Klaus

 

[nima_1981]

Thanks , and again thanks
I used audio amplifier and its good idea work good .
Nima