R. A. Penfold

How to Use Oscilloscopes and Other Test Equipment

By R. A. Penfold, Penfold, R. A.

High Power Audio Amplifier Construction (BP S.)

By R. A. Penfold

50 Complementary Metal-oxide Semiconductor IC Projects

By R. A. Penfold

Using Flash MX: BP527

By R. A. Penfold

Audio Amplifier Construction

By R. A. Penfold

Practical Alarm Projects

By R. A. Penfold

An Introduction to PIC Microcontrollers

By R. A. Penfold

Micro Interfacing Circuits: Bk. 1

By R. A. Penfold

Micro Interfacing Circuits: Bk. 2

By R. A. Penfold

Electronic Music Projects

By R. A. Penfold

More Advanced Electronic Security Projects

By R. A. Penfold

Electronic Security Devices

By R. A. Penfold