Using TL494

The usual problem with this sort of thing is trying to test it without a load connected.
Try searching for appliction notes for the device. I think Texas is usually pretty good with app notes. Or google TL494 circuits.
Do you have an oscilloscope? If no, then it's pretty fruitless trying to do any real electronics.
If Yes, are you getting the sawtooth waveform?
Del

Hi Del,

I got the sawtooth waveform at first. but after trying to change the components positions, by having C1 (pin 8) and C2 (pin 11) connected to Vcc and resistors at E1 (pin 9) and E2 (pin 10), i didn't get the result i wanted. so, i connected them back according to the circuit shown. unfortunately i didn't get the output. the resistors did get really hot when i tried. is it possible that the tl494 is damaged?

is it possible that the tl494 is damaged?
Almost certainly. If you return the circuit to a previously known working state and it no longer works, it's a pretty good bet it's blown.
Del

putting VCC on the outputs? C1 and c2 why did you that?

you could play with RT and CT values

And the 1in+, 1in- and 2in+, 2in- voltages

but never exceed the absolute maximum ratings on any in- or output

Hi Epke,

i decided to try the emitter follower configuration. then getting the output at E1 or E2. it was on the datasheet so i thought of giving it a go.

may i ask, is the duty cycle controlled by feedback and dead time ctrl pins while the frequency is controlled by CT and RT pins?

Thanks!

according the spec yes, the RT & CT sets the oscilator

check the apllication notes for more in depth info (like dell said)

for example;

http://www.ti.com/lit/an/slva001e/slva001e.pdf

i managed to get the TL494 working. thanks for all of your help :D