Low-pass Filter?

[audioguru2]

A stepdown transformer and a bridge rectifier makes pulsing DC that won't power an electronic circuit. A huge filter capacitor (20,000uF or more) must be used to smooth it into usable DC.
The center-tap of the transformer in the inverter circuit, pin 8 of the LM358 dual opamp and pin 14 of the CD4047 all must be connected to the positive of the power supply.

 

[hericlj]

Thank you very much.....

 

[xerex8]

Good day Audioguru. I've read all the topics posted and they are all helpfull.
Im a mechanical engineer by profession and I like to learn some electronics as well.
  My question is how can I make the 500W inverter to use a 24V dc power input?

I will Patiently waiting for reply
   
thanks in advance

 

[audioguru2]

My question is how can I make the 500W inverter to use a 24V dc power input?

Change the transformer's voltage.
Change all the transistors to higher voltage ones but use less.
Add a voltage regulator for the oscillator and add gain to the opamps.
It is like a complete re-design.

You are a mechanical engineer? Then how can I cut the weight of my car to half so it can go nearly twice as fast?
Similar. ;D

 

[xerex8]

Thanks audioguro

can I still use the IC1 and IC2 but I have to use another IC ( to convert  24VDC to 12V DC)? Andwhat IC( model number) should I use. Because I dont know a site to find  a datasheets.

thanks

 

[audioguru2]

Hi Xerex,
I use www.datasheetarchive.com to get datasheets but 1st I need to know the part's number.

The max supply voltage for a CD4047 is 18V. Use a 12V zener diode.
The max supply voltage for an LM358 is 36V so it is fine with 24V. It needs to have a gain of 2 so its 12V input from the oscillator is amplified to 24V for the transistors.

 

[xerex8]

HI AUDIOGURO, is there a replacement for CD4047 coz I cant find it here in manila
thanks

 

[audioguru2]

A 4047 is made by most semiconductor IC manufacturers. Their prefix isn't all "CA". Motorola (now called ON Semi) call theirs an MC14047B. All newer ones have "B" as a suffix which means the outputs are buffered. Some manufacturers use uA as a prefix and call it a uA4047B. Texas Instruments used to call theirs an SN4047B.

I just looked. Toshiba doesn't make it.

Rhonn is in The Philippines. He helped me fix the original faulty project. His e-mail address is on our corrected schematic.

 

[MP1]

xerex,
The 4047 is only giving clock signals of 50 or 60 hz which are complimentary to each other. If you cannot find a 4047, the same could be achieved with a 555 and an inverter chip.

MP