16 Volt DC conversion to 12 Volt AC

Google LM317.
M.

 

Oops missed that, I see now it has been posted in other forums also.
M.

 

Take a look at a 555 inverter circuit.

 

What do you wish to do with the AC generated?
What frequency should the AC be?
What waveform do you want?
What power do you want?

 

12V AC is 34V peak to peak so a transformer or an H bridge will be required.
A square wave is easier to generate and the motor may well run OK on this.
A DC motor would be the easiest way to go.

 

You could use a power oscillator driving a 50Hz step-up transformer.

The oscillator might use an automotive audio power amplifier IC, or else a few discrete parts.

The classic Bill and Dave in the garage oscillator topology is not hard to get working.

You may have to wind your own transformer.

A separate oscillator stage would provide a bit more stability.

This approach will not be optimized for power efficiency or mass production unit cost. It will do what you say you want, but may not be best for your actual application.

There are many more questions we might ask, such as:

How many of these will be built.

How much time and effort for design & debug are in your project budget?

What test equipment is available for debugging?

What components do you have in your junkbox that might be used for this project?

Where do you purchase your electronic components?

How small must it be?

How efficient? Is there some minimum output power that must be provided?

Can you settle for slightly less than 12VAC on the output? If 11VAC were enough, no transformer would be required in a (fairly) simple design.

Does the motor require extra current to start running? ( LRA ratings?)

Is the demand for 12VAC intermittent? Does the motor just run and run with a constant load, or is it starting and stopping, or running without load at times?

Does the 16VDC supply have an internal impedance? Is there any need to minimize input ripple?

Is the 16VDC supply highly regulated, or will it vary? How much might it vary?

Do you need isolation between the DC input and the AC load? Or must they share a common ground?

Are there EMI requirements to be met? Other regulatory considerations?

The more we know, the better our suggestions are likely to be.

Ted

 

There are a number of IC for producing 60hz etc, one is the ELM440, it uses a very common 3.8mhz colour TV
The output can be simply amplified if necessary.
Google elm440 and also AC generating IC.
crystal .
M.

 

I would use a gate in a CMOS 4093 and a resistor and capacitor to make an oscillator. Feed the signal into a cheap H bridge, there is one which will output 5V suitable for driving the 4093. Total cost about £3. (GBP)
A 555 is a little more complicated but would do.

This would be well worth trying if you are not too fussy about extreme frequency accuracy and if a square wave will not upset the motor.

 

@Duke Can you elaborate on this please?
Wouldn't you need more than one gate to produce AC?

 

Perhaps mod one of these.... good starting point.

http://www.ebay.com.au/itm/DC-AC-In...193324?hash=item21154b8bec:g:5E0AAOSw0UdXtvZJ

 

Found this 555 circuit at:
http://www.555-timer-circuits.com/12v-to-240v-inverter.html

I'm thinking if output transformer was modified to a 2:1 ratio, the output would be about 20vac?