You need to define "on". If "on" is "close to the supply voltage", a PNP will turn off.NotASmurf said:is there such a thing that blocks power from emitter to collector when base is on instead of the contrary?
Several possibilities. You could reinvent DTL (Diode-Transistor Logic) or (as mentioned above) get hold of a decoder (they are not much more expensive than transistors). See for example http://www.onsemi.com/PowerSolutions/product.do?id=MC14028BNotASmurf said:Hello, in a small scale project I need a way to get 7 outputs from 3 inputs,
NotASmurf said:Hello, in a small scale project I need a way to get 7 outputs from 3 inputs, I have an idea how to do that using transistors but the cost adds up due to the high amount of transistors, it would simplify things space wise, and cost wise if I could eliminate the NOT gates, is there such a thing that blocks power from emitter to collector when base is on instead of the contrary? Any help appreciated.
A transistor that stops current when the base is powered is also known as a PNP transistor. When the base is powered, it creates a reverse-bias and prevents current from flowing through the transistor.
This type of transistor works by using a PNP configuration, where the base is connected to a positive voltage source. When the base is powered, it creates a reverse-bias between the base and emitter, preventing current from flowing through the transistor.
The purpose of this type of transistor is to act as a switch or amplifier, controlling the flow of current in a circuit. By stopping the current when the base is powered, it allows for precise control and manipulation of the circuit.
This type of transistor is commonly used in electronic devices such as amplifiers, audio equipment, and power supplies. It is also used in digital logic circuits, where it acts as a switch to control the flow of current between different components.
One potential drawback is that these transistors have a slower response time compared to other types of transistors. This can limit their use in high-speed applications. Additionally, they may require a higher voltage to operate, which can increase costs and complexity in some circuits.