Hi All
I'm working in a project well a simple pic multi-meter based on on bench power supply one I have working ok, Now I want to make a portable meter of it now this would be ok if you made sure you got the connections the correct way roun, I know I could add reverse polarity diodes but I...
why do people need to waste time on simulating the design beats me, The PSU works perfectly has it so in my eye why try and reinvent the wheel.
I've found from past experience simulating don't always to seem to work like they do in real life. you can't feel the monitor for heat ;D
You could not have set voltage anyway, You could set the voltage with the wiper but you would have no way of limiting it, if you where to move the pot. The only way would be remove pots and use PWM from the pic. The same goes for the current control. You can read real time voltage,current and...
I remember now why I created a new BOM is that some of the parts do not exist now like the .33R power transistors resistors . I will check that all the values are correct and I have decided to leave my version has it is, After all it is so simple to cross reference between the two drawings and...
R17 is R16 on my schematic They are both laid out the same order so you can cross referaence from the original version. If I get time I will correct my version so it's the same has the original
So you have used Audio's schematic ?, Did you redraw the schematic and then transfered the design over to the PCB package then once you laid it out you ran the DRC rule checker ?
or Who's PCB layout you used ?,
The only reason I ask is if you have just laid out the PCB yourself just from the...
Looking at your PCB the output tracks are still not big enough to take the current for 5A and yes the pads need upgrading.
Here is the modified version this will either do the 3A or 5A version, For the 3A just leave out Q3A & R20A
For the 5A change R7 must be 0.27 ohms/10W (TB4 or the 2...
Yes it will require a little Mod, I only built the 3A version I've never really as the need for 5A, The mod is esy to do you can just hardwire the third transistor onto the exsisting tracs just solder the emitter resistor straight onto the pin of the transistor. I can mod the pcb to take the thr...
I never had that problem, Have you checked that the bridge rectifier is correct ?
I used one like this from here
http://www.rapidonline.com/Electronic-Components/Discrete-Semiconductors/Bridge-Rectifier-Diodes/4A-8A-In-line-bridge-rectifiers/29673
It's like audioguru stated it must have been...
You could do what I did went to the Texas instruments web site and ordered some samples then you get them for free.
You need to listen to audioguru the old design has many faults, I have ben there and done that tried everything to get the old design to work but in the end it went in the bin and...
It is sized 1:1 and it does not need to be mirrored.
When you go to print it just make sure the the page scaling is set to none, This is how I did mine and it worked perfectly.