Voltage division doesn't 'accept' piezo speaker

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Emil Skovgaard

Joined Jun 6, 2015
37
As i had good experience receiving help last time i asked a question i will try again,

I have attached the circuit down below.

I'm supplying the circuit with 3.0V. I'm using a voltage divider because i want a precise value for my piezo speaker. I want my piezo speaker to receive 0.88V (is going to be fitted in a bigger circuit). My R1 is set to 100 Ohms, and my R2 to 42 Ohms. By doing this, i can measure 0.88V at the pin going to the speaker (when the speaker is NOT there). But when i insert my piezo speaker, and measure the voltage, it drops to around 0.546V.

How can this be? Has it something to do with the piezo speaker having a inner resistance or something like that?
 

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Jony130

Joined Feb 17, 2009
5,127
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