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pcb pad trace
Hello,
Thank you, maybe someone can answer another question on this topis.
Is the column "External Component lead/termination, uncoated" good for above 10,000 feet (3050m)? Bare board calls out < 10K/3050m and > 10K/3050m.
Thank you,
Ron
determining conductor spacing for pcb
Hello,
I need clarification regarding conductor spacing on a PCB. I want to make a Relay PCB that will operate at up to 170VAC. The trace width will be .040", OD of the solder pads will be .070". The PCB treminal blocks I will be using have a pitch ot...
7805 041 regulator 5v
Hi Brain and Baysidebecca,
I was once told there is a way to polarity protect using a diode and PTC fuse. I have drawn it out but cannot come up with a way that it will work, that I can see anyways.
Any ideas on this?
I am still going with the 1.5 amp diodes in...
1 ampere diode polarity
Hello,
I want to say thank you to Brian and baysidebecca.
I am going with Brians recommendation and simply using the diode, and I will use the 1.5 amp diode 1N5397 (only .041/100). I will mount it slightly off the PCB in case I draw a little more current than expected...
how to make pcb reverse polarity protection
Hi Brian,
Where the TIP125 comes in.......
If the TIP125 base is connected to 1K ohm resistor which in turn is connected to ground. Polarity plugged in properly TIP125 conducts and let current through.
If polarity is reversed then the base tied...
diode de protection recom 7805
Hello Brian,
I have a 1N4004 in the circuit now. The 1N400x datasheet says that it is rated to 300mW. I could have up to 48 leds (10mA each) connected via the I/O expansion modules so I could draw 500mA at 5VDC.
Will this heat up a 1N400x to much? This is...
ic 7805 polarity
Hello,
I have a PIC circuit I want to protect against reverse polarity. I have added 4 I2C expander IC's to the 18F4620.
12 - 15VDC input into a LM7805ACT.
I was originally going to put a 5 amp Shottkey, bought some and saw how hard it was to bend the lead to the proper pad...
Hi,
I want to protect a PIC board I have designed and want to polarity protect it. I will have 2 or 3 I/O expansion boards as well and think that I could have upwards of 500mA on the 5V side.
I could try to use a 5A Shottky diode but the leads are so think it will make mounting it a pain.
Is...
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