Tom, That microphone has an internal amplifier, and the resistor acts as a collector load resistor. I would guess that anything from the recommended 820 ohms up to about 2k would work, but I can't say for sure since I do not have data on the current drawn by the amplifier from a 5 volt supply.
If your microphone works, leave it as-is. If it does not (or results in a distorted signal), then change the resistor when you can get one. 73, Don W3FPR On 9/13/2011 12:22 PM, TJ Campie wrote: > Thought of something else I ran into last night - I did not have any 820 Ohm > resistors to install on the config connector when wiring up for my Icom HM-7 > microphone so I used a 1.1k - what are the effects of using a larger value? > Should I try to find/make an 820 Ohm resistor or does it matter? > > TJ W0EA > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
