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Hi All,
I am using Proteus 7.7 and I would like to separate my signal, power and analogue grounds by using a star point.
I am designing a four layer PCB so the star point would be best placed on an internal layer, I have been able to create a new component with pins overlapping for placement...
Hi jack,
Sorry for the long delay, I too have started a new job. I hope yours is going well.
Keep me up to date, I will check in more often.
Have a good xmas.
Chris
I think you could use TRIAC's, they are cheap AC switch's.
And the gate current would be less than a relay, also the on resistance should be low.
I have little experience with them though, so hopefully someone on here can either confirm if I'm right or not.
Regards
Chris
Jack,
It just occured to me that you should add a fuse.
You could add one straight after the diodes D2 & D5, you could use an axial 1A quick blow, or a resettable fuse.
Just thought it would be a good idea to protect against short circuit, wouldn't want to pop the batts.
Chris
Hi Jack,
Here is a zip file with a new schematic (just changed the battery terminals), a fresh BOM (should be the same) and a new netlist.
I have changed the component package details to the correct ones, however there is no guarantee they will work with VeeCAD you may have to change the...
Personely I would start with C, and use AVR's.
This is based on experience with various micro's including PIC, AVR, MSP, RABBIT...
AVR's are in my oppinion perfect for the beginner.
There are loads of dev kits available and "AVR freaks" forum is full of tutorials, you will also find lots of...
Hi Barry,
Actually I believe the zener diode I mentioned adding before the IC will create a load.
Carefull selection should mean that when the volts rise on an non active channel the diode will eventually conduct and stop the signal going out of range.
Agreed it does presume the 4-20mA signal...
you can change the .txt to .net it shouldn't make any difference.
I had a look at the netlist, it looks like it doesn't accept the minus "-" symbol as a valid pin name, try changing the minus symbol to "2" and try again.
Auto routers are over rated, I have laid out dozens of PCB's and never...
You could use an analogue switch such as : ADG714/ADG715 (SPI or I2C).
These IC's can handle up to 30mA per channel, this means you can place the "load" resistors after the IC, that way any inherent resistance in the analogue switch wont matter and you will always get an accurate Vout at the...
I assume you mean 4 to 20mA ?
If so you can just add a resistor to gnd:
volts/amps = ohms = 5/0.02 = 250
so use a 250 ohm resistor which will give and output of 0 to 20mA = 0 to 5V
(1V will equal 4mA)
If you really need 4 to 20mA at 0 to 5V, then you can either do it in hardware with an...
Hi Jack,
No probs, here is a tango netlist:
I use proteus (ISIS) for my designs and I'm not familiar with VeeCAD.
I hope it works as tango is the only format that VeeCAD supports which I can export.
I was thinking, before you start on the strip board, it might be prudent to post the...
Well if you really did get a shock then check the volts between the PSU + and - and a earth, maybe your power supply is faulty.
But the soldering iron should be fine, 12V wont give you a shock.
---------- Post added at 19:06 ---------- Previous post was at 19:05 ----------
when checking the...
It should be fine as the PSU ground should not be referenced to the circuit you are soldering.
I dout you really got a shock, you can only just about feel a tingle at 60V, prob just sharp tip or too hot.
Regards Chris
Sounds like you overloaded it. I would personely scrap it, unless you can see a component that has obviously burnt out.
The reason is without proper test equipment like a mulitmeter and scope and a schematic of the PSU then it could be very difficult to establish what has gone wrong.
Multiple...
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