Audio Power Amplifier Design Handbook, Self, Douglas, Used; Very Good Book

Practical Electronic Building Blocks Book 2 by R.A. Penfold Paperback - RARE

Power Supply Projects, R. A. Penfold Bernard Babani BP76

Music Projects (Maplin Series) by Penfold, R. A. Paperback / softback Book The

Easy PC Interfacing (Babani computer books), R. A. Penfold, Used; Good Book

A Beginner’s Guide to TTL Digital ICs. R.A. Penfold. 1993. Logic Circuits Book

Practical Fibre-optic Projects: 374 (BP S.) by Penfold, R. A. Paperback Book The

Getting the Most from Your Multimeter (BP), R.A. Penfold, Used(Paperback, 1988)