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CREG Newsletter 3
published in Spring 1989. (This is a bit-map scan).

Bosch Drills
The application of Bosch electric drills to caving by Ben Bentham.

Number of Turns has no Effect on Loop Antenna Performance
David Gibson derives an expression for the performance of a loop antenna and demonstrates that the number of turns is not a contributing factor.

Dryfit Battery Charger
Rick Platt presents the circuit for a Dryfit battery charger.

Circuit Ideas - Ultrasonic Rangefinding
A simple circuit based on the Plessey TBA120S is given.

Software Listing
A BASIC program listing of software for calculating the output frequency of an LC oscillator is provided.

Review - Speleonics 11
Nick Williams reviews the latest issue of the American cave radio & electronics magazine.

Feedback
David Gibson provides some feedback on a letter about LEDs for distance measuring in issue 2.

Terminations for Ribbon Aerials
Some practical tips by David Gibson.