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View Full Version : SMPS 12V->+/-30V Subwoofer car , with TL494 and TDA7294



userdiysmps1
05-20-2014, 12:33 PM
My subwoofer amp. with TL494 , LM324 , TDA7294.
Next step : test in car .
Schematic : here-> http://www.schematicsforfree.com/archive/file/Automotive/Circuits/Audio/TL494%20Car%20Audio%20Power%20Supply.gif .
First test : here-> https://www.youtube.com/watch?v=0TyUvigJ0QQ .
Opinions ?

https://www.youtube.com/watch?v=0TyUvigJ0QQ

Thx!

MicrosiM
05-21-2014, 10:11 PM
Looks nice setup

KX36
05-22-2014, 12:37 PM
Congratulations on having built something working.

The +VCC line breaks the isolation through Q6, as does the ground through R33, so I'm curious as to whether you actually think you have isolation or not, since you have the 2 separate grounds joined by a parallel resistor/capacitor.