From a872b42ff1d5ec2de215d997a8147748282c455e Mon Sep 17 00:00:00 2001 From: xyzroe Date: Thu, 24 Jun 2021 14:43:37 +0300 Subject: [PATCH] additional intercom connection info and diagrams --- README.md | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/README.md b/README.md index 5e99875..a4c2eec 100644 --- a/README.md +++ b/README.md @@ -24,12 +24,22 @@ One flash - OFF, two flashes - ON. ## Important info +#### 1 In Gerber PCB v1.0 committed on Apr 14, there are some errors in the silkscreen layers: 1. 'Line-' and 'Phone-' are reversed. 2. '+' and '-' are also reversed. Just plug by swapping. +#### 2 +The problem of cross-calls to other apartments: +it was revealed that the intercom circuit is closed through the reverse diode of the u2 transitor (thanks to @Alex_AW) +to prevent it, you need to add a diode according to the diagram: +![](/images/fix_error_rings.png) + +#### 3 +If you want to use the battery version without a handset, do not turn off the sound in z2m, but use an external resistor to emulate the intercom handset, according to the diagram: +![](/images/battery_no_handset.png) ### How to join