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Registered Member #6857
Joined: Sat Sept 22 2012, 08:25AM
Location: Srbija, Novi Sad
Posts: 40
I bought a lovely little pwm controller called SG3524N in a local shop, cause they had no TL494s, I followed the datasheet and I came up with attached circuit. It's working pretty fine for 12V, but I'm having trouble making it sing. I tried few things like applying audio signal to current limit comparator, or feeding audio signal to the base of external transistor, and then feeding the emitter current to the shutdown transistor base, but none of those worked.
I'm just a hobbyist, so I do have some huge gaps in knowledge, but it would be awesome if anyone could just give me an idea how could I achieve what I want :)
I've never used that chip but I am experienced with the SG3525, its brother. I capacitively couple line level audio into pin 6, the Rt timing resistor, to achieve audio modulation.
I was going to post a schematic I use for the 3525, but the pinouts are too dissimilar to be of much use to you, I think.
Registered Member #6857
Joined: Sat Sept 22 2012, 08:25AM
Location: Srbija, Novi Sad
Posts: 40
Finally managed to get some audio output by connecting the audio out to Rt pin, but my phone starts to mess things up when it's connected, how could I fix this?
Make sure you capacitively couple the audio in, don't DC couple it. (Use a series nonpolar 2-10uF cap, or polar with positive towards the Rt pin). DC coupling leads to all kinds of problems.
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