Of course I already opened it... it's an simple circuit with an sliding switch and a RC filter connecting to the Dynamic capsule. Will make an mic amplifier probably based on similar design to this one: http://www.zen22142.zen.co.uk/Circuits/Audio/ecm.gif
Size comparation with the Yaesu "something" (update: YD-148) mic:
Another photo:
Regarding the previous post circuit, if you place an 3pF capacitor connecting the "top" of L1 and L2 the circuit works better on the airband frequency (and others) but not with the performance I want... so now I will get some "Néosid" coils and adapt a 137Mhz receiver circuit to the 118-134 band...
Circuit will be similar to this one: http://lpistor.chez-alice.fr/imagesite/radio/radioorig/rx137simp4.jpg
Meanwhile is summer so posts will slow down....
5 comments:
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