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 general electronics

Another Test Probe

This one used an SMA plug, so it is a bit more versatile. The SMA plug was from Maplin. The…

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…

Posted in general electronics

Test probe

This test probe is based on an SMA connector and spare test probe parts: Side view: Parts used: Pomona test…

Posted in application software general electronics

XCircuit on Windows

XCircuit is a drawing program ideal for circuit diagrams, but also for other purposes. I compiled it to run on…