Hello ListMembers,
In first place, thanks for your responses. It was very Instrutive. Now I am looking for X7R and COG caps for outdoor applications (Mr. Alois) !
Reposting my question:
Looking all over books and in the Internet, I found many different values for same applications. This, also for capacitors between amp-op. stages and for transducer input.
In the case of the transducer, it is a piezo one. I have now a different supplier, with more specs.
Its center frequency is 40 KHz (+ - 1 KHz), bandwith (-6 dB) 1.0 KHz. The capacitance@(1 KHz + - 20%) is 2400 pF. Impedance at 40 KHz is 15 K Ohm (!)
The DC voltage is about 8V, this will deppend on the circuitry chosen, and leakage is not a issue for now.
Best regards,
Best regards,
Paulo
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