Sine wave generator circuit

[PA3040]

Dear All,

I want show to school student about Rectification and AC to DC covert / DC Smooth circuit using Capacitor

For this I need to use a transformer which is high voltage

Therefore I have decided to make a Sine wave generator using simple circuit , Then I can ignore the Transformer

Please advice the tested Sine wave generator that I can Use for rectification
It also better if we can change the frequency fro 0 to 60

Thanks in advanced

 

[Easy peasy]

How a bout a common garden mains transformer that steps down to 12Vac and then put a 10 ( 20W ) ohm resistor on it to limit the current to 1.2A rms - a lot easier I think - and safe.

 

[PA3040]

Frequency controller is the issue

 

[KlausST]

Hi,

Any ready to buy sinewave generator,
Or a PC or cellular phone with audio output (plus APP to generate the desired frequencies)

and a DC coupled audio amp.

Klaus

 

[Easy peasy]

as above, sig gen and audio amp .... 50W ( internally protected ) ....

 

[BradtheRad]

Simple square-wave oscillator made from inverter-gates. Add a third inverter to create bipolar AC at the load.
A large capacitor smooths the waveform so it is sine-like.

To vary frequency put a 1M potentiometer for the 300k resistor.

If you make the diode bridge from led's then it increases the visual impact as they flash alternately. Careful not to overload the led's.

 

[PA3040]

Hi,

Any ready to buy sine wave generator,
Or a PC or cellular phone with audio output (plus APP to generate the desired frequencies)

and a DC coupled audio amp.

Klaus

Yes...This is the modern solution . I am really appreciate

You mean Installed the Frequency Generator app to Smart phone , Then we can send the waves to as a sine waves by amplifying using single transistor and then we can use it for AC to DC converter

Grate thanks

 

[KlausST]

Hi,

I don´t know your requirements regarding voltage, current, precision and so on.
Thus I don´t know whether a single transistor would work..

But it should work as simple tool to "show" how an AC to DC rectifier works.

Klaus

 

[d123]

For low voltage circuits, so that you could show the principle you are looking for with even just a battery as the power supply, and where a beautifully perfect sine wave is not a strict requirement, a 'Wein Bridge Oscillator' or a 'Low Frequency Sine Wave Generator with Quadrature Output' (one signal is a horrible 'sine wave', the other quite good) could work. See AN-31, Op Amp Circuit Collection, section 2 'Signal Generation' for such circuits. This could be rectified with a precision full-wave rectifier circuit or just a diode bridge. Op amp sine wave generator and rectifier circuit could be a way of showing the uses of op amps and AC-DC rectification.

What about a tiny transformer with very low output current capabilities. I have a dual output 220VAC to 12VAC transformer that can only output ~70mA - it is about 5x5x5cm. That would be good for adding a diode bridge and showing ripple vs capacitance, bad for having to make the thing and add fuses, even if it is a small circuit.

 

[PA3040]

For low voltage circuits, so that you could show the principle you are looking for with even just a battery as the power supply, and where a beautifully perfect sine wave is not a strict requirement, a 'Wein Bridge Oscillator' or a 'Low Frequency Sine Wave Generator with Quadrature Output' (one signal is a horrible 'sine wave', the other quite good) could work. See AN-31, Op Amp Circuit Collection, section 2 'Signal Generation' for such circuits. This could be rectified with a precision full-wave rectifier circuit or just a diode bridge. Op amp sine wave generator and rectifier circuit could be a way of showing the uses of op amps and AC-DC rectification.

What about a tiny transformer with very low output current capabilities. I have a dual output 220VAC to 12VAC transformer that can only output ~70mA - it is about 5x5x5cm. That would be good for adding a diode bridge and showing ripple vs capacitance, bad for having to make the thing and add fuses, even if it is a small circuit.

Thanks

I also think Tiny Transformer is very reliable and user friendly and less complicate . How ever it is grate if we can go to more handy method, That using Mobile phone Frequency generator by the app, . I made a single transistor amplifier in the breadboard for testing , I connected a LED to output and connected Mobile phone jack to input but it wasn't success

 

[KlausST]

Hi,

I connected a LED to output and connected Mobile phone jack to input but it wasn't success

Please focus on technical descriptions, show the schematic and give a detailed error description.

Klaus