To: | [email protected] |
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Subject: | Re: LF: audio amps |
From: | "Johan H. Bodin" <[email protected]> |
Date: | Tue, 17 Aug 2010 14:15:31 +0200 |
In-reply-to: | <002e01cb3dfb$0bd364c0$0301a8c0@your91hoehfy9g> |
References: | <002e01cb3dfb$0bd364c0$0301a8c0@your91hoehfy9g> |
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Yes, a DC blocking capacitor is a good idea in some cases. For example, between the audio amp's output and the primary of a matching transformer. Otherwise, a large DC current may flow due to a small DC offset from the amplifier since the winding resistance is close to zero. This is not the case with a loudspeaker which has many ohms of DC resistance. 73 de Johan SM6LKM mal hamilton wrote: > It has been suggested in the past to use a 15 to 20 uF capacitor in > series with the amp output to the antenna, but the transformer method > might be better or use nothing and match the low Z to the antenna. > de mal/g3kev > |
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