System timer IC

Why not? Probably best chip _ever_ designed. ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Wow, that's high praise. I never liked it much. There should have been one optimized for astable and one for monostable.

Didn't some company make an improved CMOS 555 that was a drop-in replacement for the original 555 (unlike the old 7555)?

Probably so expensive as to be useless..

What did they pay old Hans back in 1972 to design that thing, like 10 grand maybe? Best ROI ever...

No problem on my custom chips ;-) ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Probably much more than that. By 1972 I was making ~$30K, though I started at Motorola in 1962 at $6760.

And the Bay Area pay was higher. ...Jim Thompson

"CMOS-Osc-NoClip.pdf" on the S.E.D/Schematics Page of my website. ...Jim Thompson

Cool!

Interestingly, I believe your 1962 salary was approximately the sale price of a 1962 Cadillac Eldorado. I saw one at a show over the summer. What a car. I'm a little annoyed I missed out on those days.

I think my first memories are from around 1983 or 1984. I should scan some of these childhood pictures I have of growing up in the late

A (new) 1961 Renault Dauphine cost me $1545

Wouldn't know... never touched the stuff. ...Jim Thompson

I use that structure (without the resistive divider which side steps ESD input diode clipping of jelly bean parts) on many of my custom chips. ...Jim Thompson

All the CMOS versions are lower voltage and lower drive, iirc. (The uA555's abs max was 18V.) I occasionally use the LMC555 in protos.

Cheers

Phil Hobbs

CD4060 for the time base, CD4017 Johnson counter to steer the output to the correct meters (or whatever).

Or 744060 and 744017.

They should still be available, and cheap.

Thanks. I like the 74HC series...for battery powered audio equipment a 5 volt supply is a nice compromise between lack of headroom and power consumption, and 74HC works well there. I think that chip in the link above also provides a virtual ground on a pin as well, which is pretty nice.

Cheers

Phil Hobbs

It's been a long time since I looked a 4017 data sheet but I remember looking for a guarantee of non-overlap and didn't find it.

Maybe Phil skips an output.

--sp