can anyone provide me with some schematics for a function generator with only a 147.7 square wave AC signal?

can anyone provide me with some schematics for a function generator with only a 147.7 square wave AC signal? and im trying to make a it as small as possible

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If this is for "wireless power", just use a 555 timer.

tykora (author)  steveastrouk3 years ago

so if you could get me a schematic of how I could use it

Take a look here:

If R1=4.7K and R2=2.7K and the cap is 1nF you should be near enough. You can use trimmers for R1 and get the frequency bang-on

tykora (author)  steveastrouk3 years ago

an actual circuit schematic would be more helpful

That WAS an "actual circuit". Plug in the values I worked out, and possibly put a transistor there to drive your coil.

tykora (author)  steveastrouk3 years ago

oh :P (this is why I ask for help)

thx I couldn't recognize it

tykora (author)  steveastrouk3 years ago

everyone keeps telling me that but I haven't learned enough yet to but a schematic together yet

tykora (author)  tykora3 years ago


See helps to be concise.

Try this built right the circuit is about the size of a match box.

full swing.bmp
tykora (author)  Josehf Murchison3 years ago

there are no 147.7kHz crystals or 0.1477MHz

If you cant find a 147.7 try these.

I know you can find 147.5 on the net add a .2 and mix giving you a 147.7

Go higher and PMW down.

Go higher and counter down.

tykora (author)  Josehf Murchison3 years ago

ive been all over the web still cant find any that add up to the frequency im looking for

Try these people

I got this datasheet on this crystal from them.

tykora (author)  Josehf Murchison3 years ago

yah.. cant find them on there either

The crystal in the datasheet goes from 30 to 180 kHz

Just order one in 147.7 kHz

tykora (author)  Josehf Murchison3 years ago

it wont let me create an account to order one

tykora (author)  tykora3 years ago

and there all out of stock

Well if you can’t get a crystal get a SN74LS629 voltage controlled oscillator and adjust it to 1477000 Hz then run the 1477000 Hz through a decade counter like a 4017 to give you a 147700 Hz frequency.

Now here is a silly question 147.7 what?

Hz, kHz or MHz.

The thought just struck me be concise or you may not get the answer you want.

tykora (author)  Josehf Murchison3 years ago

sry kHz

How accurate does the output have to be ? Can you make that frequency from dividing a standard crystal frequency by an integer ?

Steve 147.7 what?

He didn't say.

He he, you're right !

It struck me that is a standard crystal.

That is a very tight frequency.

You can make it with a 555 timer.

But no matter what way you make it you will need a oscilloscope for fine tuning.

...unless its crystal locked.