Posted in linux radio Single Board Computers

Raspberry Pi 3B+ Wireless Chip – Cypress CYW43455 Block Diagram

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

Posted in eagle mixer radio

EAGLE CAD Toroid drawing tool

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

Posted in radio

Toroid (Amidon) calculations

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

Posted in radio

Quadrature detector coil

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

Posted in radio

Tuned Front End for FM receiver

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

Posted in radio

Modern take on Ryder’s FM Receiver

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

Posted in audio radio

More TEF6606 info

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

Posted in audio radio

Simple op-amp based headphone amp

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

Posted in microcontroller radio

Implementing I2C

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

Posted in radio

TEF6606 receiver

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