This always happens......

Just wanted to vent....

 

Just squeeze that 1N5821 in a vice a bit...

That reminds me... I once saw that someone had tuned the value of a resistor by using a Dremel moto tool (or similar) and a small rotary sanding drum to take a "U"-shaped section out of the side of it...

 

Do you use pcb layout software? Makes it so that doesnt happen.

If you dont, get EAGLE. Www.cadsoft.de. Relatively low learning curve, i think.

 

Just squeeze that 1N5821 in a vice a bit...

That reminds me... I once saw that someone had tuned the value of a resistor by using a Dremel moto tool (or similar) and a small rotary sanding drum to take a "U"-shaped section out of the side of it...

I once used a Dremel to change a 1N5821 to a 5082-2835.

 

Just squeeze that 1N5821 in a vice a bit...

That reminds me... I once saw that someone had tuned the value of a resistor by using a Dremel moto tool (or similar) and a small rotary sanding drum to take a "U"-shaped section out of the side of it...

I think that only works with carbon composition resistors. It's been a long time....

 

LOL! Practice, practice, practice. You'll get better or learn to let the fat ones live half an inch off the board.

 

I know how it feels,just bad luck...

 

I think that only works with carbon composition resistors. It's been a long time....

Actually, we've done that to increase the resistance of chromium coated tungsten rods used for vacuum deposition. Shaved the diameter to half over the length of the rod with a diamond burr.

Ken

 

Quote:
Originally Posted by SgtWookie
Just squeeze that 1N5821 in a vice a bit...

That reminds me... I once saw that someone had tuned the value of a resistor by using a Dremel moto tool (or similar) and a small rotary sanding drum to take a "U"-shaped section out of the side of it...

I think that only works with carbon composition resistors. It's been a long time....

Definitely not going to work with wire wound resistors...

 

@jerseyguy: can you use a SMD diode on the back side? It might look a little cleaner if you can get a large enough package to span the thru holes.

Wish I could say I'm immune to these things too. Just last week I found I had miswired a SOT-23 AGAIN! I seem to have a particular brand of mental defect I refer to as "transistor dyslexia," the complete inability to understand the simple spacial relationships between base, emitter and collector.

In this case, I was laying out a previous working PCB design to a new form factor, same parts, different board shape. I "improved" the SOT footprint to the "standard" pin 1 2 & 3 configuration without checking my schematic symbol which was laid out to some random configuration, so the auto router and design rule checks thought all was fine. And since I had already made "this" board I shorted my manual checks.

Fortunately I could spin the device and still get proper connectivity to ship my prototype.

 

I have a set of templates I call PaintCAD. I try to draw the components as close to real size as possible, Someone mentioned the PCB software, the same thing applies. I use Express PCB, but in this the exact software doesn't matter a lot, the feature is in all of them.

Experience helps, but this is definitely a case of measure twice and cut once.

Look at it this way, it fit.

 

@jerseyguy: can you use a SMD diode on the back side? It might look a little cleaner if you can get a large enough package to span the thru holes.

Wish I could say I'm immune to these things too. Just last week I found I had miswired a SOT-23 AGAIN! I seem to have a particular brand of mental defect I refer to as "transistor dyslexia," the complete inability to understand the simple spacial relationships between base, emitter and collector.

In this case, I was laying out a previous working PCB design to a new form factor, same parts, different board shape. I "improved" the SOT footprint to the "standard" pin 1 2 & 3 configuration without checking my schematic symbol which was laid out to some random configuration, so the auto router and design rule checks thought all was fine. And since I had already made "this" board I shorted my manual checks.

Fortunately I could spin the device and still get proper connectivity to ship my prototype.

I just shoved it in as far as it would go and soldered it on. I decided in the end that I didn't really care if it looked pretty or not.

 

I have a set of templates I call PaintCAD. I try to draw the components as close to real size as possible, Someone mentioned the PCB software, the same thing applies. I use Express PCB, but in this the exact software doesn't matter a lot, the feature is in all of them.

Experience helps, but this is definitely a case of measure twice and cut once.

Look at it this way, it fit.

I use expressPCB as well and had to draw the terminal block from scratch. I guess I read the dimensions wrong on the datasheet. But like you said.....it fit....just not very well.

 

I'm not familiar with Eagle, I use Orcad's PCB Editor (Allegro), which has a "place bound" property, basically a keep-out area for other place bound shapes. Keeps from putting a part on a part IF you make the footprint correctly.

If.

I would be surprised if Eagle didn't have a similar feature.