Hello Everyone,
I am a novice in Electronic Design. I need to drive an LED depending on the signal I am getting out of a modem. The modem gives the output as two different frequence (ie FSK modulated). I wanted to know different ways to do this. As of now, I could come up with the following ideas.
1) Vcc | | | / \ Rc / |------------ Rb C o/p of modem -----/\/\/\/----B (NPN) LED E | |------------ | | GND
2) Vcc | | | / \ Rc /