Here's a .gif animation in case you haven't seen it.Nice job working out the schematic, but it makes it clear that the chip is not a 555 or 393. 7 is Vcc, 1 is GND, 5 is an output.
BTW, where did the 555 internal schematic come from? Link?
ak
The Stuart Warner company I worked for was Icknield Instruments.Ian, there is no clue on the instruments as to who made them. Just to conclude this thread I'm posting pictures of the three tachos which were bought for next to nothing. Probably a TVR owner somewhere would bite my hand off to have them !!
View attachment 90597 They are about 100mm diameter.
Here's a .gif animation in case you haven't seen it.
AnalogKid seemed interested in the inner workings of the 555, I thought he might be interested in the .gif#Gerty, its a SN76810P, not a 555 timer....
The reason I asked about the drawing is that it is one of the rare few that are correct. The animation is not. In the original 555, only the -Q latch output drives anything. It drives the discharge transistor directly, and drives an inverting output stage. The Q output doesn't drive anything internally or externally. It is a minor difference, but it helps to know how parts really work inside.Here's a .gif animation in case you haven't seen it.
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