Your toilet won't flush? How jolly inconvenient!

Modern, low-level cisterns don't last like the old, high-level, chain pull bogs use to.

One of the most common complaints is when they become difficult or impossible to flush.

This could be the reason why...

Electret Microphone Preamplifier

This design runs from a 5Volt USB supply and attempts to minimise electrical noise.

I wanted to create a simple preamp for an electret mic insert using components from my bits box.

So component values and transistor types are not critical.