[Boatanchors] Fw: Re: OT audio amplifier

[Kees & Sandy]

At audio frequencies it has to be a large value (say 2-10uF+) and most of the inexpensive ones are aluminum Electrolytics .....which is fine. If you want a better audio cap, use a Mylar ....but keep the value in the 2-10uF range (added cost and it's not really required). If you use a smaller value, you will affect the low audio frequency response. Try it and see, can't hurt anything and you will remember the results better ....and tell others. Heat up the old iron and try it. 
73 Kees K5BCQ

---------- Original Message ----------
From: "Dick KF4NS" <kf4nsradio at verizon.net>
To: <boatanchors at mailman.qth.net>
Subject: [Boatanchors] OT audio amplifier
Date: Wed, 13 Jul 2011 16:09:08 -0400

I wish to pick your brains. Does anyone remember or have you built an 
audio amp replacement for the LM386 using the SSM2211 as was in CQ 
under the column Math Notes?

The copy of the article I have shows a 2.2ufd electrolytic as the 
input coupling capacitor. Being a hollow state born and bred guy, this 
puzzles me. Why an electrolytic?

I am sorry but I cannot find what issue that article was from but the 
amp circuit is pretty darn close to the spec sheet from Analog Systems 
which shows their "typical application."

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!


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