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Re: [RFI] RFI Clean Audio Amplifiers For Amateur Use?

To: Tony <73guddx@gmail.com>, Rfi List <rfi@contesting.com>
Subject: Re: [RFI] RFI Clean Audio Amplifiers For Amateur Use?
From: KD7JYK DM09 <kd7jyk@earthlink.net>
Date: Mon, 5 Oct 2020 09:36:45 -0700
List-post: <mailto:rfi@contesting.com>
I'm looking for an RFI-free audio amplifier that I can use to power the external speakers on my SDR transceiver. The PC speakers I've tried were very noisy, especially the USB powered speakers from China.

Almost anything from a thrift shop made in the past thirty plus years, that runs on a wall-wart from 6 to 12 volts. Use a battery, linear transformer (about a quarter), or clean SMPSU (25 to fifty cents, same thrift stores...). So long as your local shop isn't in a high rent district, expect to pay no more than a buck or two for a pair of speakers, or five to ten for a fancy surround sound system with a sub-woofer, although the sub-woofer will require AC to drive it, if the rest of the speakers are nice, re-donate it.

I don't know if that's been been mentioned here before, but the portable, and QRP boys have been doing this since the early 90's when super awesome free-to-cheap RFI-less PC speakers began flooding the stores, yardsales, and hamfests. Best of all, most are through-hole, so easy to interface.

Kurt

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