Grumpy What are you trying to build, is it a ring counter for the tetra, if so i built this some years ago and had it running, i used 2 74HCT74 D types and 1 Nor gate, i can dig the circuit out if you wish. For pulse width and phase delay i used 2 monostable for each Channel, i went on to design my digital delay monostable using a 1nS delay line chip which formed the basis of my Explosion in the wire experiments. If I am using 3 of the 5 inputs, what do I do with the other 2? Just connect them to one of the used inputs When building the monostable be careful, some chip manufacturers have slow and bad timing abilities, there are some monos that can work down to 80nS, to be honest it was a long time ago i cannot remember which chip or manufacturer i finally chose, it worked ok because all 4 channels had a mono board and therefore any slow responses were evened out across all 4 boards which just left the phase adjustment to the required firing alignment, the minimum pulse width was restricted to the datasheet specs though, which is why i went on to build the digital mono's that were adjustable in nS increments. The problem with the Tetra is we do not know how fast or at what frequency it should be running at and because at the time people were speculating it should be running at 60MHz i gave up due to the complexities of running it at such speed, from tests you would never be able to run the brooks coils at such a high speed anyway they would appear as capacitive loads due to the 1.8km of wire i used for each coil. One thing though i did pickup fast switching transients across the output doughnut coil and at the time i did not realize any significance to that.
« Last Edit: 2013-12-31, 13:31:59 by Peterae »
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Topic: NOR Gates (Read 12234 times)
