Simple 12v Inverter Circuit please..?

[vonsworld]

Hello

I have an old digital clock for which I would like to create a power supply. It requires 12v AC at exactly 50Hz, which it uses for timing purposes.

I could just buy an AC to AC 12v mains adapter and plug it into the mains. However it would be nice to also power it from a 12 volt battery.

Please can anyone suggest a simple 12v DC to AC inverter circuit to give 50Hz from my battery pack?

Will maintaining exactly 50Hz from a battery source be difficult, thus making the clock inaccurate for timing?

Many Thanks

 

[Resqueline]

The inverter needs to be crystal controlled in order to get the accuracy you expect from a clock. It doesn't matter what kind of power source is used.
If you can find crystals at 1.6384MHz, 3.2768MHz, or 6.5536MHz then a simple binary divider chain will arrive at 50Hz. There are other ways with other frequencies.
Here is one example of a crystal controlled inverter design. I'm sure it can be done even simpler if you find this too complex.