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== How to connect a analog monitor to an Raspberry Pi 4? ==

The Raspberry Pi 4 can also output an analog video signal that can be used with old CRT-Screens. Lets have a look into the official schematics [https://datasheets.raspberrypi.com/rpi4/raspberry-pi-4-reduced-schematics.pdf] of the Raspberry Pi 4. 
[[File:Av-jack-pi-4.png | center  | 500px| The A/V Jack ]]
The part J7 is an A/V jack socket with four connectors: 
# VDAC_COMP (the video digital to analog convertor == video signal)
# GND (the tree symbol means in the langauge of schematics Ground)
# AUDIO_R (the right audio channel)
# & 5. AUDIO_L (the left audio channel)
     
And this is how it looks on the Raspberry Pi 4:
[[File:Rp4avjack.jpg | center | 500px | The A/V Jack ]]

This socket is for a TRRS jack connector: 
# T (TIP) is connected to AUDIO_L
# R (RING 1) is connected to AUDIO_R
# R (RING 2) is connected to GND
# S (SLEEVE) is connected to VDAC_COMP

[[File:Jack-trrs.jpg | center | 300px | The A/V Jack ]]
     
To connect to video signal of the Pi you need to solder a composite video cable to the jack connector. 

[[File:Pi-adapter.jpeg.png | center | 620px | The A/V Jack ]]