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Hi, I have a PLC that I'm trying to send a PWM signal out to a DC motor driver for varying speed.
My PLC output signal is 24VDC sinking type and I vary the duty cycle from 0-100% over a pre-selected set frequency. I can connect a small DC motor directly and control speed nicely. But I have...
Hi there,
First off a bit of background, this is part of a university project where I want to control the flow of water from a reservoir into 12 small tanks (the flow going into each of the 12 tanks needs to be the same, roughly 30ml/min). My way of achieving this is to use 12 peristaltic...
Hi All,
Total Newb here in respects, but have soldered boards before and have an extremely basic understanding of electronics.
I am would like to design a pump timer with 4 separate settable pot timers;
1 timer On for X seconds
1 timer On for Y seconds
1 timer On for A seconds
1 timer On for...
I am using fairly robust D882 and B772 transistors in my design, so I am wondering if I still need 4 damper diodes to protect the transistors as shown below? (Leaving them out saves a little on space and cost.)
After searching the internet, I got a lot of clues but no answer. Here is the answer.
The LM3915 bar / dot display driver wants an analog input up to 1.25 volts where the tenth LED comes on.
Arduino analog output is actually PWM at 5 volts, using a 5 volt supply.
This gets a smooth voltage...
Hi!
In order to cool a telcom device I am using 4x 12Vdc fans from Delta Electronics (the exact type is FFB0412VHN-F00). The fans have a 3-wire interface and I operate them by sending PWM pulses at their power supply wire. The pulses are generated from a PIC-microcontroller and are "converted"...
Hello,
I am creating a PWM signal by comparing a sine wave (50Hz) and a triangular wave arrier (10kHz) ,in ordem to control a full bridge inverter.
II had been try filter this pwm signal to obtain a sinusoide, with a LC filter. I use this equation to find a cut-frequency of the filter (and...
Micro 18F4431 - Assembly
In spite of having used the above, several times in the past with no issues, today, after replacing in a working design, the 18F452 in charge with a 18F4431, I found the keyboard and LCD, not responding. After much RTFM, I noted that pins
RB0 / PWM0
RB1 / PWM1
RB2 /...
I'm working on dimming a high-wattage LED (50W--12V/4.17amps) with a 3.3V micro-controller. The solution that has worked so far is by using a low-side (PNP) MOSFET to drive the LED and a NPN transistor to drive the MOSFET via the 3.3V signal from the MCU. At 488hz PWM I can dim the LED light...
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