I would like to use the sound out of the nano Geiger. How is that configured...

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Q1: I would like to use the sound out of the nano Geiger. How is that configured to use?
Answer 1:
schematic:
https://gitee.com/cajoetech/geiger-counter-nano-oled
Geiger Counter with nano mega328p and LCD 1602
https://gitee.com/cajoetech/GeigerCounter1602Nano


Model geiger counter V1.1

TTL signal could be used on D2 point (R17), or write code in Arduino, and you can use the TTL interrupt signal input .
for GMv1.1 use the INT(R19) signal as TTL output to MCUs.


Q2: Ok, what are P3, P100 and U110

Answer 2:
P3 is used for TTL signal output supposed to be connected  to MCU interrupts.
P100 is on/off option for TTL signal output through U110.
U110 is in geiger counter -V1.1 model , it is  headphone jack which often used to be connectted to computer through sound card audio input.
U110 is not the headphone jack 3V power.

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