Hi Paco, Sorry to read that it did not work for you.
LM386 amplifiers can do strange things when over driven. There is a lot of available gain. If the amplifier is operating properly, the Idle DC voltage with no audio signal on the output pin 5 should be half of the DC voltage measured on the power supply pin 4 if not you may have a leaky coupling capacitor on the input circuit or a bad IC internal circuit throwing off the bias. I have also found at times from building my own equipment that a de coupling capacitor with short leads is needed across the power supply pins 4 and 6 to keep it stable at high output levels especially if the impedance of the power supply is not low enough. I use a 10uF tantalum capacitor when connecting it is very important to observe the correct polarity. Also the RC network connected between the output pin 5 and ground is required to keep the amplifier stable at high frequencies at different loads. GL 73, Bob Johansen WB2SRF _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
