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

More Advanced Power Supply Projects R.A. Penfold BP192 Babani Hobby Electronics

Easy PC Upgrading, Penfold, R. A.

Electronic Security Devices BP56 R. A. Penfold Babani Hobby Electronics 1979 PB

Boost Your PC's Performance By R. A. Penfold

Coil Design and Construction Manual B.B. Babani Bernard BP160 Hobby Electronics&

How to Use Oscilloscopes and Other Test Equipment R.A. Penfold Babani BP267 &

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