Lab Notes: 17/06/18

Some good news! Using a square wave oscillator to provide loop functionality does indeed provide more stable operation when 'loop' is active whilst recording. The only downside is that the oscillator is bleeding into the audio input of the ISD1820, which results in a high pitched whining sound being recorded. I suppose the other downside … Continue reading Lab Notes: 17/06/18

Lab Notes: 16/06/18

PN2222 Transistors

Todays lab session saw me looking into the unreliable behaviour of the ISD1820 Voice Recorder Module when attempting to record whilst the loop switch is active. The datasheet states that the record function takes precedence over every other function, so providing the record pin is high the device should record. Therefore, I assume that the … Continue reading Lab Notes: 16/06/18