The ISD1820 voice circuit is a popular choice for simple audio recording applications. One important consideration when designing the circuit is the bias terminal of the microphone and the negative terminal of the 220uF capacitor. These can be connected to the RECLED terminal, which is typically at a high level. When this connection is made, the microphone does not receive any voltage or current, effectively reducing the power consumption of the entire circuit to almost zero. However, it's important to note that this configuration may affect the functionality of the pass-through mode, as the circuit might not operate correctly in that scenario. Always ensure that the design meets the specific requirements of your application before implementing such a setup.
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