Help for - Dynamic Search System - The search system is updated weekly and is simple to use. 1. Enter any combination of letters and numbers in higher or lower case. 2. Using the example BU508A - Enter BU508 or bu508 will give the same result which will include all the affix’s – some 20 different varieties. 3. Click on the Part No of the part required which is automatically placed in your shopping basket. If you entered ‘508’ only you would find 57 semiconductors etc. containing ‘508’. The search would be too wide to be of practical use. In the case of ‘7805’ you would display 16 records most being voltage regulators which could be extremely helpful. If you have any suggestions for this ’Help for’ script please click on ‘Contact us’