![]() ![]() THE INFORMATION ON THESE PAGES ARE HERE AS A COURTESY & FOR CONVENIENCE PURPOSES ONLY, & ONLY FOR ELECTRONIC REPAIR TECHS!! If you are looking for manuals, please do not email us requesting this information. Please subscribe to the free email list in the menu below & you can post your tough repair problems there. PLEASE NOTE: We can no longer answer personal emails regarding repair information. Home audio, car audio, electronics technicians webpages. We are your computer hardware dealers / computer hardware suppliers.Ĭustom built computers also available, consumer electronics sales, ![]() Orpheus Computing & Audio Electronics Repair Technicians pages, Computer Upgrades Training manuals for CTC175 CTC-175, CTC176 CTC-176 and CTC177 CTC-177 chassis, tuner troubleshooting guides, semiconductor, IC and transistor cross reference and much more I also bought the Tower's FET selector as well The internet is great, but I still like to browse through specifications in a book now and then.Electronics Repair Tips Downloads Information & Electronics Cross Reference Software Downloads for Electronics Repair technicians. For GBP12, it's a bargain so I have placed an order. I just took a look on Amazon.the Tower's International Transistor Selector is still available The latest revision seems to be December 2008 and it includes SMT transistors. Some circuits just will not behave without a very close equivalent part. This is crucial for good equivalent selection. One thing I did learn all those years ago, was to read the schematic and decide how critical the components specifications were to correct operation. SMD stuff is too modern for it though so I then have to fall back to internet searches. The internet has changed searching for equivalents but I often find the Towers book faster as I grew up with it and know many favourite equivalent transistors. It lists the transistors specifications and any equivalent (but not all) You can flick through various ranges of transistors and select a suitably specified part. I still have my copy from the 1980's and it still serves me well. In the UK when I worked as a 'Saturday lad' in an electronics shop, I used the 'Towers Transistor selector' book. Substitution of RF power devices needs to be approached with a great deal of caution,& preferably with a Spectrum Analyser on hand. Modern devices as a rule,are better spec'd than older ones,so a common modern type may replace an old special type. ![]() In more complex circuits,have a look at what devices other manufacturers use in similar circuits-there may be a common device which will do the job. If it is something simple,like a lamp,LED,or relay driver,you can probably replace it with a more common type without any drama. If you can't find a listed equivalent,one good philosophy is to look at the circuit the device is used in. Not only did they often disagree,but by the time you had tracked from one book to another,the specs on the final one you turned up were many times quite different to the original. At one of my earlier jobs,we had semiconductor equivalents book from several sources. Good luck finding anything that will do that!(though it must be out there somewhere) Many times the equivalents shown in the various books are harder to find than the original component. ![]()
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