Lee, In broadcast & pro-audio (probably other services) - microphones aren't impedance matched. Normally you want to have the microphone load impedance (amplifier mic input) at least 10 times the microphone's characteristic impedance. My K3 schematic shows a 10k input pad-out resistor to a 100k feedback resistor so the 600 ohm microphone should have no issues. George - AI4VZ
Just came into possession of an ElectroVoice PL91 microphone. The specs says it has 150 ohm impedance. I think that the K3 would like to have 600 ohms. I would imagine that this could be used on the K3 if you used an impedance transformer. Comments? Lee - K0Wa ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
