Quote:
Originally Posted by Rubin
Thanks for your quick reply.
After checking I saw that. With the trimmer calibration min-max in the emitter TR3 the output to the filter is not 0V DC (without oscillator), but output is 50mv-150mv. So i think we cannot have 0V DC because the diodes produce this increase signal
Ofcourse (without oscillator, coil and antenna) if we touch the input, the output is >8V DC. This is correct?
I repeat again i use only sensor stage without oscillator coil and antenna
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No, the out sensor stage must be 0V DC, if this is not the case it means that there is still self oscillation, indeed even with 0V volts there could still be a small signal due to the voltage threshold caused by the diodes. In addition, the antenna (even a piece of wire) must be connected because it contributes to the possible self oscillation.