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I can't use transformer. Because my circuit is often standby (no load operation) and it push current few seconds when is used. As the circuit in installed in a block box and there is no air movement, the heat of transformer will hurt the circuit elements. So I need an ac/ac converter that is in form of an IC or by using some electonic elements.Nigel Goodwin said:It's called a mains transformer!.
No it most certainly is not clear. What key? What speaker?Fahime said:The current I need is 100mA.
Regarding with NO LOAD, I mean the times that the key is not hitted and so the speaker doesn't works. Is it clear now?
I wouldn't really call the BP5041A5 an IC. It is a switching regulator modual with a built in inductor. So I guess if you are looking for a more cost effective solution, you could look for a switching regulator IC and roll your own.Fahime said:Hi, I've found an IC that converts 220vac to 5 volt dc. It would be exelent. It doesn't need any dc voltage to run. But the problem is the cost. The IC number is BP5041A5.
I have a melody Ic, an audio amplifier and a 8ohms loadspeaker. The supply voltage should be about 4volts.Nigel Goodwin said:You really need to tell us what you're wanting to feed - it makes all the difference!..