194Views11Replies

Author Options:

Is the circuit ok? also please explain "What the circuit is doing"? Answered

The circuit shown is supposed to produce AC where v1 is a 9v battery, c1,c2,c3,c4 are capacitors and t1 is  a transistor (BD140), R1 is a resistance

AC squarewave of 140-150 kHz is required .........sorry for poor image quality please use "magnifier " if needed.....Thanx in advnce!

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
jatinbatra
jatinbatra

8 years ago

I have tried simulating it but output is weird
i'm getting0voltage supply
any changes in circuit ?
http://www.docircuits.com/circuit/display/id/224

0
mpilchfamily
mpilchfamily

Answer 8 years ago

Why are you trying to use this design?

The design doesn't work because the +V doesn't have any way of reaching the output. Follow your connections. Each circle is a connection point between multiple lines. Any other lines crossing each other are not connected. So V+ is connect directly to ground through C4 and thats it. Everything else is only connected to the ground side of the circuit. All that circuit is doing is charging C4 to the same voltage as V1. All the other components are only connected to ground so you don't have a completed circuit there.

What you need to do is drop this circuit and start fresh. Unless you know what your doing with designing a frequency generator your not going to be able to sort it out. So find a known working circuit. All you need to do is goolge for a frequency generator schematic and you'll find many workable options.

0
jatinbatra
jatinbatra

Answer 8 years ago

can u explain what is circuit doing?

0
iceng
iceng

Answer 8 years ago

R1, C1, C3 and one side of the output are only connected
to ground through C2, T1 and the base emitter junction.

There is no connection to +V1 !!!

Sorry  the  CIRCUIT  DOES  NOTHING as it is drawn.

A

0
jatinbatra
jatinbatra

Answer 8 years ago

i didn't get...can u explain further?

0
steveastrouk
steveastrouk

Answer 8 years ago

There's no supply of power to the output.

0
mpilchfamily
mpilchfamily

8 years ago

I could be wrong but i don't think that will produce a square wave for you. My knowledge in this area is limited but i think you will need a PWM circuit to generate a good clean square wave. You could use a micro controller that has PWM to generate 150 Hz easily. All you would have to do is program it and your good to go.

0
jatinbatra
jatinbatra

Answer 8 years ago

if possible please explain in detail...and what is this circuit doing...and please see again i have updated it!

0
mpilchfamily
mpilchfamily

Answer 8 years ago

That circuit will likely create a sign wave. Like i said my knowledge is limited here. So i'm unable to explain exactly how it will all work.

0
mpilchfamily
mpilchfamily

8 years ago

Depends... what are you trying to accomplish? What kind of AC output are you looking to get?

0
jatinbatra
jatinbatra

Answer 8 years ago

i am looking for squarewave of some 150 kHz frequency