# Circuit Design

Joined Mar 15, 2021
4
Hello,

I need to make a circuit that need to change 220-230v 50 hz sin wave to 10v 4k hz square wave.

Due to my research at internet i couldn't find anything so any help is appreciated.

#### ericgibbs

Joined Jan 29, 2010
18,258
hi Ness,
Welcome to AAC.

E

#### bertus

Joined Apr 5, 2008
22,233
Hello,

Divide the project in blocks.
Wich blocks would you need?

Bertus

Joined Mar 15, 2021
4
So, i'm an engineer intern and this will be my first assignment. Therefore to print this out I'll appreciate every help since i lack a lot of information about this.

For the circuit I'll need 22:1 rated transformer for voltage drop then Schmidt Trigger will do the work that will gave me square wave. The problem is i stucked at the frequency multiplier part. I don't know what should i use.

#### ericgibbs

Joined Jan 29, 2010
18,258
hi Ness,
A transformer 22: 1... 230/22 =~10.5Vrms.
Do you know how to configure a full wave rectifier for this 10.5Vac, to turn it into a DC voltage.??
E

Joined Mar 15, 2021
4
the thing is i'll still need ac voltage therefore no need to convert to dc with rectifier. i need help with the frequence multiplier.

#### bertus

Joined Apr 5, 2008
22,233
Hello,

You will need DC even if you use a frequency multiplier.
The frequency multiplier will need DC power to work.

Bertus

#### Deleted member 115935

Joined Dec 31, 1969
0
the thing is i'll still need ac voltage therefore no need to convert to dc with rectifier. i need help with the frequence multiplier.
You are suffering as many new to electronics do ,
they come up with an idea, then follow it, which is good
But you must be open to other ideas.

First question I would ask is , how do I make a square wave out ?
you have concluded to use a frequency multiplier and a Schmitt,
there are other ways to make a square wave

have a look around for square wave generation circuits, see what you find.