Don't hurt your stamp

KenM

Unfortunately due to user error, stamps can sometimes be damaged when attempting to drive a load. This seems to crop up every few weeks.

In that regard check out the attachments below.

The file names should be self explanetory.

death by stamp

yeah, i have never used a transistor to swich a load, standard practice for me is using a MOSFET.

plus i don't use a 100k that leads to signal degredation i use a 10k.

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-~Kill~-

death by stamp

oops, and i use a 1kv diode between the gate just incase high voltage punches through.

and in my case i think a 100k lets the input float too much 10k ties it down really well.

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-~Kill~-

KenM

I see you made a post, found that you wanted to·add to·the post, and created a new one.

If you are not aware, you can edit your own posts. To access this feature click on the icon of a pencil in the upper right corner of your post.....FYI.


Post Edited (KenM) : 4/10/2005 3:51:12 PM GMT

Rick Brooks

I use the "No brainer" circuit (IRL 540 and 10K Gate-Source) to fire IR LEDs for distance object sensing.

With the BS2SX the command is:
FREQOUT PIN, 1, 15000

Then there is a 10 to 20 msec delay before I repeat the sensing.

Once I tried to reduce the delay between sensing to less than 10 msec and smoked the Stamp pin (actually, five pins for five IR LEDs).

I assumed that at 37.5 kHz, the capacitance of the FET gate was loading the Stamp pin too much.

Comments?

Rick