pnp

  1. K

    ATMega328P Communication with 24V PLC

    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...
  2. I

    Speeding up fall time on PNP transistor high side switching circuit.

    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...
  3. B

    Controlling the supply to a Hall effect Sensor (A3144E) with another A3144E

    .
  4. M

    drive mosfet with 3.3V, minimal component count

    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...
  5. aapitten

    Help with PNP-Based SPDT Switch with 'Off'

    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...
Top