Welcome

This site is always under construction.   Last updated 17 May 2009 valve tester updated.

Click on the button on the left for a circuit diagram of a push pull valve amplifier, it is based on an old Ferguson TV audio output stage and uses a pair of ECL80s in push pull.

The simple light seeking robot was built by pupils of a local secondary school as part of an activity day.

The simple Stirling engine was built from materials that are available in most school science labs and can be used to demonstrate a simple heat engine.

The simple oscilloscope design is intended to produce an easily constructed and useful instrument that should perform well for audio work.  This will have more features and a bigger screen than the Mullard Pupil's oscilloscope.

email: dball102000 at yahoo dot com