Sine wave inverter

[Kevin Weddle]

In reference to the design of the inverter under the projects section, couldn't we replace the opamps with transistors? If the device that supplies the sine wave operates at 5v, shouldn't it be a 12v device? Could somebody hint at the design change because I feel that it is not designed entirely proper.

[audioguru]

Hi Kevin,
Please provide a link to any project that you talk about. You probably mean this inverter project:

It is a square-wave inverter, not sine-wave.

You could replace the opamps with transistors if you use enough of them, to provide a fairly high-current pullup and pull-down, like the opamps perform very well.

Nothing in this project operates at 5V here, but the CMOS 4047 oscillator/divider can operate with a supply from 3V to 18V.

Many things in this circuit are not properly designed, but what do you see that is wrong?

[absolution]

taking a transistor in a bridge amplifier and tapping at the collector would produce a phase shift is that what ur looking for?

[audioguru]

Hi Absolution,
When you say "tapping at the collector", do you mean to add a capacitor to ground to form a simple single-stage low-pass-filter, creating a maximum of 90 degrees of phase shift?
If your bridged amplifier is fed with a square-wave, its output with that simple filter will be a curving triangle-wave, not a sine-wave. Why not just feed your amp with a sine-wave?
Since it will be operating as a linear amp, it will get very hot.
That is why we use square-wave or Class-D circuits, they operate much cooler (and waste less power) since they switch very quickly.