Re: [Elecraft] Re: K3 Caution when using an external monaural speaker

2008-12-20 Thread David Cutter
Wayne I will be doing all the mods for Christmas. Hope you can give us the info really soon so I don't have to take the K3 apart again. Can you just point to the circuit and tell us what you intend ahead of the official mod instruction? 73 David G3UNA To this end, we're working on a

[Elecraft] Re: K3 Caution when using an external monaural speaker

2008-12-20 Thread wayne burdick
Hi David, Lyle, KK7P (who designed the KIO3 board set) will create an application note and post it as soon as possible. The short version is: put 1/8-W (or larger), 470-ohm resistors from each speaker output to ground. (The actual value isn't critical; anything from 330 to 1000 ohms would

[Elecraft] Re: K3 Caution when using an external monaural speaker

2008-12-19 Thread wayne burdick
Thanks for your observations on this, Todd. Just to be safe, we recommend using a stereo plug even when only a single external speaker is being used. This is discussed in detail in the owner's manual (page 20 in the case of revision D). Just use the TIP contact of the plug for the speaker,