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    Power supply circuit ideas

    I have a project which required 3.3v (170mA), 5v (1.2A), 12V (not sure yet). For the 3.3v I am going to use an AMS1117-3.3 which is more then enough so this is not an issue. I have 2 questions mainly as follows: I want to use 8x of these stepper motors driven by 8x DRV8825 and I am not sure if...
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    What's the difference between 8 & 32

    Hello all, Ok so I have a project, I am not in a hurry to learn and the main purpose here is to learn. But I need to learn the right way. Basically my question is this... What is the difference from an Atmel 8 bit uC to an Atmel 32 bit uC from the Programmers Perspective? As in, what is the...
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    Choosing a Mosfet to switch an Electric Match

    Hi Guys, I have a couple of questions but I know you might be busy, I would appreciate ANY answer even for 1 question.  :-* I have a situation where I would like to switch an electric match. The typical trigger power for such a device is 12v 800mA - 1A. I have three questions for this. 1. I...
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    Opto Coupler Common Ground

    Hi Guys, As I understand opto couplers, their main use is to isolate a circuit from another,mainly for protection purposes. In my case I have an Arduino which controls a couple of shift registers (74HC595) which trigger transistors and I would like to protect the Arduino and the Shift Registers...
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    Powering a device with Ac and Dc

    Dear Friends, I am building a device which requires 12VDC however it can either be powered by a car battery which is already 12V OR by 12VAC (or maybe 16VAC) At first I thought it was simple because I can simply put a bridge rectifier and a 7812 and AC or DC won't effect my electronics. But...
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    Mixing Voltages

    Hello all, I have a project at the moment and everything is to work from a single 12V battery. Now I am using an Arduino which has its own 5V regulator. Since I intend to switch some ICs and a relay, I can't just power everything from this poor 5v regulator. Can I for example have a...
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    A Clean Output

    My dear friends, I am currently designing a circuit whereby using 16 pins of a micro controller, I would like to trigger 64 outputs using the attached schematic. I plan to do this by using a matrix style connection (8 x 8). The schematic only shows this using 6 pins (3 x 3) otherwise it would...
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    12 V to 3 V Question

    Hi all, Sorry for a simple question but I need to be sure. I have a 12V 2A power supply (thus making it 24W). I need to power some LEDs which take 3V 1A (thus making each led 3W). Can I use a 7803 with heatsink for each LED with this power supply (upto a max of 8 LEDS? 3 x 8 = 24W) Thanks
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    Voltage / Frequency Powersupply

    My Dear Friends, I have an old system which basically allows me to vary DC voltage and frequency such that the output is like a square wave in a function generator but which can take a couple of Amps. At the moment, I have a large transformer which supplies power to another variable transformer...
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