Design a circuit diagram by referring to some information and combining with others’ opinions
The function is to amplify the input signal and then transmit it wirelessly
The power supply is 5v. The current problem is that the circuit is actually built, and it is found that the transmission range is limited, only about 1 meter, and the attenuation is very strong when it exceeds it.
How to optimize the launch of about 10-20 meters?
In addition, the input signal is a low-frequency signal, almost 100khz, how to design this antenna?
Thank you all
Andres ポストする October 28, 2020
Google's wireless microphone circuit diagram can be used. Normal 50 or 60 meters is not a problem.
Santiago ポストする October 28, 2020
Isn’t the antenna 1/4 in? You’re 100kHZ, how long is the antenna? Then your antenna is not matched.
Sierra ポストする October 28, 2020
Yes, because the signal is a low-frequency signal (long wave), it has limited propagation, unless high power
The antenna has a dedicated loop antenna, which supports 10khz-100khz, which is sold by a certain product. Putting aside the antenna problem, is there room for optimization of the circuit itself?
Is there any effect of the first-level triode amplification?
