First of all can sumone describe pulsating current to me is it like AC? and second of all wat converts DC to a pulsating current. I have a circuit drawing in which there r fixed capacitors (electrolytic and monolythic), PNP transistor. There is a transformer in it too but my teacher says the pulsating current goes tohrough the transformer so i need to no what changes the DC into pulsating current. Thx