This
is a circuit that will help you sort the TRANSISTORS you have in your laboratory,
and will also help you choose the best of them for your projects. It will
also show you if the TRANSISTOR is PNP or NPN.The circuit can also be used
to check some types of diodes.The printed circuit board is small and if
you use a small box to put it in you will have a convenient and portable
TRANSISTOR tester.SUITABLE BOX 2036. V9VDCPCB 35x43mm