1. R

    Variable PWM generator

    I need help with setting up pwm generator with variable frequency and duty cycle from around 10 Hz to 150 kHz, with important parameter of time 20 ns or less for the shortest pulse width. What kind of IC can i use in completing such circuit (not 555).< My profesor suggested using CD4538 IC >
  2. D

    5V PWM to 12V analog for lighting control. Arduino

    Hey, so I've got to build the circuit to output the signal specified below I've currently got an Arduino UNO and I have written the code to output this. however, I can only put out 5v from my Arduino and the circuit requires 12V and 10V output, being able to switch between12 and 0v incredibly...
  3. G

    HW Interface to detect Radio Control Receiver PWM signal

    I am using an Arduino Pro Mini to detect a PWM signal from a radio control receiver. The input pin on the Arduino is supposed to be limited to 20mA current with a max current of 40mA. I plan on using a 220 ohm resistor in the circuit. Do I need a .1uF cap to ground (and what kind of cap)...
  4. rodolfoviolac

    H bridge l298n in Parallel Burning Out After Some Time

    Hi Guys, I have a college project where I need to controll a motor (27V / 3 A), I used a H Bridge l298n in parallel to support the current, It worked for while and then stop but I don't know what was wrong. Does any body know anthing that could help me? The motor is a Maxon 118752 precision...
  5. Tamás Fegyvári

    BLDC DC Bus current waveform?

    Hi! I would need some clarification with a BLDC DC bus current.(Marked With IL on the picture) The motor is a BLDC with trapezoidal commutation and 20kHz PWM. I beleive that current is the 20 kHz PWM with an amplitude of the maximum current of the motor. Is it right or I misunderstood...
  6. F

    Pulse Density Modulation

    Hi, I would like to implement a Pulse Density Modulation circuit on LTspice. It substantially consists of cancelling some pulses, maintaining the period and the duty cycle fixed. Can you suggest me how to implement it? Please see the attached picture of the idea. Thank You.
  7. H

    Using 12v brake-light signal as a switch to ground a set of LEDs

    I just want to start by saying I have some knowledge, being an Industrial designer, but I am by no means an expert. I have a set of US taillights, that I have successfully converted to UK regulations (yellow indicators) and I am currently working on a dual function tail/brake light feature. I...
  8. G

    PWM - Average current

    Hello, I am trying to put a circuit together to operate a solenoid valve using PWM 25kHz, 50% duty at 12V. I have built a couple of really basic circuits to test this, the first uses a 12V bench supply driving the solenoid (12V 5W 450mA) via a VN1NV04PTR MOSFET on the low side. The MOSFET is...