iHearAll
Well-Known Member
so what is happening is the fans are running in parallel to the 555 and off a rectified 12v step down transformer. all this seems to work fine and the 555 oscillates somewhere around a kHz. i dont know the exact number.
the LEDs are running off a rectified AC mains. this is the same plug that is powering the fans.
the current is limited to the LEDs by means of MOSFET pulsing.
the entire circuit worked when i used a variable DC power supply but when i replaced the power supply with s transformer rated for 12v, it seems to have thrown off my available power to the LEDs. i cannot get them to draw more than .1a
i may have to use two separate outlets to deal with this. i did try putiing the transformer in series with the 120v rectifier. with the transformer hot going to ac main hot, the transformer neutral going to the recifier and the ac neutral going to the other part of the 120v rectifer.
this caused the circuit to all together not work.
I'll measure the current coming out of the transformer to find the inductance and see if that's the problem. the reactance could be too low and in turn, making the 120v 4-6a side (which is 30-20 ohms after the mosfet) match the ohms of the transformer cuz theyre in parallel....
anyone agree?, disagree?