lertaya.blogg.se - Pnp transistor schematic

Q1 for the NPN was a BC549CTA NPN bipolar SI transistor I also tested 2N4401 and 2N3904.

Q1 PNP = 2N3906 (I first tried a RadioShack Red PNP transistor, no other markings).

I standardized on nine volts because of two circuits I found for making a square wave and a sine wave: I originally used 4.5 volts as the source and didn’t change the resistor values when I used nine volts. These both worked just fine, though the values that worked best for the resistors were a bit different for each. I came up with the test circuits shown in Schematics 1 and 2. I decided I’d use this information to build two circuits - one for the NPN and another for the PNP transistor - to simply drive an ultra-bright white LED. Specifically for the NPN, it was for the PNP, it was. ws for the two types of bipolar transistors.

I started with the very basic transistor schematics I found on. I’ll start by showing the two circuits I put together which demonstrate that - at least sometimes - one can use NPN and PNP transistors for the same task. The only relationship between these two questions is a transistor. What determines which type of transistor to use in a given circuit? Are they interchangeable with those of a different type that I may already have on hand? Does anyone have a circuit that does not require an IC?Ġ6193 - Transistor Confusion, Donald Bodine, Middleham, UK I need a simple method to slowly fade an LED from bright to dim, then to bright again in about two seconds, then keep repeating.

This article started as an attempt to answer two questions posed in the Tech Forum here in Nuts & Volts.