The Raspberry Pi 3B+ has quite an interesting wireless chip on-board – quite a lot of functionality! Split up into…

This small bit of software can auto-generate a toroid outline for EAGLE. You can select horizontal or vertical mounting, and…

The excellent website changpuak.ch here and  here  allows you to figure out what core and number of turns for a…

Here are photos of the elusive 235SU1 coils. One will be disassembled in the name of science! It can be…

The Ryder paper (here) uses a tuned front end. The specified coils (Toko E526HN-100319) seem to be unobtainable, but surprisingly,…

The link here shows an FM receiver with a high level of claimed performance. The diagram here shows a snippet…

For the circuit that was constructed for testing (based on the Application circuit in the data sheet, the v3 copy…

This single-IC circuit is pretty basic but is enough to get the TEF6606 audio up to (very loud) headphone levels….

The ATmega32u2 doesn’t have a two-wire interface (as far as I can tell) or I2C, so this method was used…

As an experiment, I constructed up this FM receiver. It worked first time – no coil adjustments are necessary. It…