Micro-controlled VLF Receiver

My recent receiver design (circa 2011), which has neither been built nor tested, was to have the following features:

  • Single 5V d.c. supply.
  • Gyrator-tuned.
  • Gyrator tuning and second stage amplifier gain adjustment by means of digital potentiometers.
  • Zero-crossing detector, precision full-wave rectifier, peak detector and d.c. level shifter.
  • Micro-controller (Freescale MC9S08SH8).
  • RS-232 serial port.

You can download the circuit diagrams from the download page and try out the circuit if you wish, at your own risk. The circuit comes with no guarantees:

Go to download page.

I now have other, more ambitious ideas for a receiver. But more about this later.


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