Earlier version below.....

So here it is....  The Teensybat based on the Teensy 4.1 development board.

(you can use both versions, with ethernet or the slightly cheaper version without ethernet)

Functionality is mainly the same, the biggest improvement is the audio buffer, this PCB however has changed a lot. Building is much easier a the Teensy 3.6 based version. The audio buffer uses PS-RAM chips (SOP-8 SMD) that need to be soldered to the Teensy 4.1 board, with the right knowledge these are easy to solder, have a look at this video.

For those of you that wonder where the Gerber files are....  Sorry, I do not share the new gerbers.

NOTE FOR GPS USERS!  The recommended BN-220 seems to have some variants, we are using Ublox library and the BN220 using a NEO8 which works fine, maybe a BK220 can work just as well, the BE220 gave some issues, I got it working but less satellites are found and reception gets lost during use. There also seems to be a BN220xx which does not have the Ublox 8 chip be aware you have this chip!

Building instructions for the Teensybat with Teensy 4.1

This is the latest version PCB (V0.8) Schematic, there is an extra position for a second microphone amplifier to make it easier to experiment with an additional microphone element to play with stereo reception.

This is the V0.7 schematic, the audioboard is integrated, as well as charger circuit and protection. The Teensybat runs directly off a li-po cell.

Here is a video that shows you what is involved building this version.

Schematic of the early version.

The schematic of the old detector looks like this, the modifications for backlight control, GPS and temperature sensor are not on this PCB

So, I kind of ran out of materials and am concentrating on an easier to build Teensy 4.1 variant.

If you are able to order your own PCB's  here are the Gerber files for the old version (Teensy 3.6 based) I will not share the latest version gerbers.