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Thanks for all your help. Circuit is working pretty well now, should be easy to convert signal of current strength to digital one.
1 - I changed the tx / operating frequency to 50KHz. Input LC circuit now couples better.
2 - C3 is now 680pF, C1 isn't needed anymore.
3 - R8 is now 6.8K gain about 15 + 15 = 30.
4 - R4, R5, R6, R7 up to 100K to lower current draw.
Can get 0.25V signal at 1m range, rx using only 0.19mA.
Can get more gain, but noise appears.
1 - I changed the tx / operating frequency to 50KHz. Input LC circuit now couples better.
2 - C3 is now 680pF, C1 isn't needed anymore.
3 - R8 is now 6.8K gain about 15 + 15 = 30.
4 - R4, R5, R6, R7 up to 100K to lower current draw.
Can get 0.25V signal at 1m range, rx using only 0.19mA.
Can get more gain, but noise appears.
