The choice is up to you but the idea is to keep the cost to a minimum – so don’t buy anything expensive. You have a choice of building a circuit “in the air,” or using an experimenter board (solderless breadboard) or a matrix board or even a homemade printed circuit board. All you have to do is identify the leads of an unknown device, and you can build almost anything.

There are numerous categories, and I am sure many of the circuits will be new to you because some of them have been designed recently by me.īasically, there are two types of transistor: PNP and NPN. Transistor data is at the bottom of this page and a transistor tester circuit is also provided. Many components can be obtained from transistor radios, toys and other pieces of discarded equipment you will find all over the place. We have even provided a simple way to produce your own speaker transformer by winding turns on a piece of ferrite rod. Most of the circuits are “stand-alone” and produce a result with as little as 5 components.

Download transistor circuit for free