AC Controlled-Current Stimulator

Please provide some additional details. Such as, how important is it that the output is sine wave? Would a square wave work just as well or a triangle wave? You may be able to get what you want simply using a 555 timer chip. It is very inexpensive and very versatile.

Also, what frequency range are you wanting? Max freq., minimum freq.? Is the 9 volt battery the only power source?

I want the output to have a sine wave form becuase of the purpose this circuit will have (it'll be used on tissue) The 9 volt battery will be the only power source. The frequency range could be from 50 Hz to 200 Hz.

The battery will emit dc current, you think the 555 timer will help me better than an inverter. Do I really need an inverter? If so, that would be another circuit fro me to build wouldn't it?

The 555 timer circuit is so popular that you can find several examples of how to create different waveshapes using the charge/discharge timing capacitor as a signal source. And you can perform frequency modulation (sweep) with one of the inputs or just change the ratio of charge to discharge.

There have been several books printed on using the 555 timer chip for all kinds of devices. Try goggling it.

In many respects, the 555 is the only "inverter" you really need. Your use of it depends on what you want to drive.

I truly appreciate your help. Thank you very much.

The Intersil 8038 does that.

The 8038 creates a tiangle wave then passes it though a non-linear array made of transistors and makes a pretty good sinewave out of it for the final output.

Frequency is set by and R and C, and does not vary with the power supply voltage.

The sine wave's distortion is fine tunable (if you want to fine tune it) with and external 100 K Ohm pot, as I recall.

--- Rob

Find yourself a simple audio oscillator circuit using transistors and basic components, take the output of the oscillator and feed it into an audio amplifier, also could be made from transistors or an LM386 audio IC. Yes you could run this off a 9 volt battery.

The LM386 is good for up to 1 watt output and has single ended power supply requirements.

You could use 2 LM386's one as a Wein oscillator the other as the output. Its in the National semiconductor datasheet.

We often use oscillator/audio amp combinations to simulate 60hz 110Vac for testing purposes, being in australia we have 240 Vac @ 50 hz mains supply. Generally we use test instrument signal generators and big arse car audio amps to generate ac voltages at alternate frequencies.

Should not be a problem for a budding hobbyist, with a box full of common parts.

try here:

http://search.globalspec.com/ProductFinder/findproducts?query=xr2206%20function%20generator&se=ggka&setag=SEMI