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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Patrick wrote ...
I will try this, but I was going to use gasket sealer, which would squeeze out, like the cheeze whiz in a can stuff.
Here in England we have no end of cheap and nasty aneroid barometers - the kind of thing with printed gothic lettering and antiqued wood for which there was once a vogue - so you could take the bellows out of one of those if you wanted a metal concertina. There is also a type of corrugated flexible aluminium trunking which you could experiment with, though I have no experience with it myself.
A different approach might involve a compressible mass of closed cell foam like neoprene , or simply a free space above the oil filled with a stable, incombustible gas.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Proud Mary wrote ...
Patrick wrote ...
Im going to switch over to a 556 timer, one 556-1/2 will be setting the on time (monostable), while the other 556-2/2 will be triggering the first 1/2 astable (frequency).
Something like this?
Proud Mary the output from this circuit is connected to the 2nd timers reset (pin10), instead of 2nd timers output (pin9). Is this right?, where did you get this pic?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Patrick wrote ...
Proud Mary wrote ...
Patrick wrote ...
Im going to switch over to a 556 timer, one 556-1/2 will be setting the on time (monostable), while the other 556-2/2 will be triggering the first 1/2 astable (frequency).
Something like this?
Proud Mary the output from this circuit is connected to the 2nd timers reset (pin10), instead of 2nd timers output (pin9). Is this right?, where did you get this pic?
Oh dear, what a calamity! I've had the circuit on file for ages, and cut and pasted it from somewhere, but I don't remember where it came from now. I should have verified the circuit before handing it on to you, and I'm sorry for any trouble my error may have caused.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Proud Mary wrote ...
Oh dear, what a calamity! I've had the circuit on file for ages, and cut and pasted it from somewhere, but I don't remember where it came from now. I should have verified the circuit before handing it on to you, and I'm sorry for any trouble my error may have caused.
Dont worry about it, you've saved me to many times for me to be mad at. Also I havent been so foolish as to etch an unproven circuit. Besides thats what sims are for! (though I did notice it before putting it into MultiSIM 10)
EDIT: the sim just puked 1's and 0's all over, im trying to figure the circuit out.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Patrick wrote ...
Im going to use the ICL8038 function generator IC, the 555/556 are to unstable and difficult.
I've always thought that 8038 looked good fun, so I'll be interested to see how you get on with it. Intersil have it marked as "Obsolete Product. No recommended replacement," so I guess what stocks there are will be the last of them.
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