R15 PCM Randomiser (Nov 2018)

This device takes digital data (similar to TTL signal), and randomises it. This device conditions a digital data stream suitable for an analogue modulator such as a Frequency Modulator or Phase Modulator (ie: digital transmission).

The circuit consists of three parts. The input conditioning circuit. The digital randomiser, and the output buffer circuitry. This device must be able to connect to anything without blowing itself or anything else up. In a nut shell, this what the digital randomiser is doing in boolean logic form:

Here are more pics of the build: