PULLDOWN RESISTORS!

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Don't forget about putting them on your gate inputs!

Save yourself two days of breadboard head-scratching!

That is all!

[tjookum]

hehe, I hope you still have some hair left on your head .

a couple more "don't forget"'s:

Never use anything above 15v!

Get your values right, check your resistors and capacitors.

Don't switch +V and ground on CMOS chips.

Check solder joints and make sure nothing is touching where it shouldn't.

You will screw up, relax and try again in the morning.

have fun !

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Still have my hair... I know well enough that I am a hack to know that things won't work at least 50% of the time... I'm prepared for my inevitable failures

I was trying all kinds of things. I was about to give up for the night but then remembered that the last thing I worked on had weird problems caused by not having pulldowns on gate inputs...

Maybe next time I'll remember...

Maybe...

The good part of it is confirming that working with these CMOS chips is generally incredibly simple... if you remember the few basic rules of working with them.

[Rykhaard]

[droffset]

It's funny because I think every new maker (including me) has had the same hair-pulling experience that ended with pull-down resistors. It's like an initiation into a new club, except we do it to ourselves.

[-minus-]

hmmmm.... maybe it's at this point that somebody should post the value of the pulldown resistor here. Are we talking 100K here or 10K... Just love those Brown Black Orange ones! Great '70's colour combo!

[RF]

100k would be fine

bruce

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I have used both 10k and 100k but 100k seems to be the standard for some reason, not sure if there is a reason.

[-minus-]