pnp

I'm trying to trigger 24volts 1AMP output with a PNP that should be off normally and get turned on with 3.3v output that turns on a NPN. I'm having a hard time trying to figure out resistor placement and value. Any help would be apricated.

Hello, I have a circuit for which I have both a simulation and a Mathcad calculation. The circuit is designed so that the output signal (UFB_Diag) should be low (<50 mV) when the input voltage EX_in is greater than or equal to 9 V. Currently, I rely on simulation to estimate the voltage drop...

Hello everyone, I'm working on calibrating a 4-20mA current loop and I am trying to stabilize the output current at 12mA using a cascode PNP current mirror. I’m using BC327-25 PNP transistors (unfortunately, I don’t know the exact manufacturer), and after testing, I found 4 of the transistors...

Hi All, I am designing a ATmega328P based PCB control board that has a function of sending and receiving discrete digital signals to and from a PLC. The PLC has sinking outputs. The PLC can accept sinking or sourcing inputs. I want the PCB to output Sourcing (PNP) signals to the PLC. (mostly...

Hi, I have built a high side switching circuit using a PNP BJT driven by an NPN BJT. The design intent is to switch 30 VDC (supplied by a boost converter) at 1-10 kHz using a 5V Arduino signal. My rise times at 10 kHz look very good, but the fall times are slow. What is causing this? How can I...

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i have a 3.3v digital pin, attempting to use a PNP to switch an Nfet (Vdrain=5v) on/off at a rate of 1kHz. i can't use the inverting-NPN method to drive the gate because that way the Nfet would be on for a few mS after POR. Here's my circuit with a minimal # of parts: Am i full of it? Is there...

Hey everyone, As part of a larger project I need a circuit that functions like a SPDT relay, but also need an 'OFF' position. It is a rather complex application but, to explain it simply, I have a switch that has two solenoids attached to it. One solenoid moves it 'on' and the other moves...