NDB Filter 533 KHz LPF

First try making a NDB 533 KHz low pass filter

FAU Ronne

Picture of FAU locatet near Rønne airport. It is transmitting at 334 khz. It made me think back on old loop antennas that I made for NDB intercept.

Lm2917 part II

I have made the first converter board for the magnetometer. Next step is to test it

LM2917

I got all the things for the first try making the magnetometer frequency to voltage converter.

TO DO List

I got so many projects that I need a TO DO list.

Magnetometer project
 Make schematic and print layout
 Assemble and test

VLF receiver

NDB Loop antenna
 Assembling an old antenna
 Make tuning system electronic

Amplifier BFR91 for AIS

VHF Loop antenna
 Electrical and mechanical design

Light to sound circuit
 Diagram
 Schematic

Need a new bench power supply
 5 volt
12 volt