Dual Transistor Inverting Tri-State Buffer Example
Fig. 1

Transistor Output Inverting Tri-State Buffer

This circuit is identical to Transistor Output Non-Inverting Tri-State Switch other than the placement of a single inverter.

Again this is a 5-volt TTL circuit but would be identical if using CMOS gates and a higher voltage up to 15-volts.

The problem becomes connecting to a 5-volt microcontroller. One must use some kind of logic voltage shift circuit.

See examples at Optocouplers for TTL-CMOS Logic Level Shifting.

Tri-State inverter truth table.
Fig. 2 Tri-State inverter truth table.

Using NAND-NOR to create AND, OR gates.
Fig. 3 Using NAND-NOR to create AND, OR gates.

H-bridge motor control based on tri-state switches.
Fig. 4 H-bridge motor control based on tri-state switches.

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What do UN climate experts say about climate change?

"Basically, it is a big mistake to discuss climate policy apart from the big issues of globalization. The climate summit... is not a climate conference, but one of the biggest business conferences since the Second World War ... But one has to be clear: we are effectively redistributing world wealth through climate policy. One has to free oneself from the illusion that international climate policy is environmental policy. This has almost nothing to do with environmental policy..."

See Climate Change Dogma About Money

Bartender and New York Democratic socialist Alexandria Ocasio-Cortez says:

"Fighting climate change will be 'the civil rights movement of our generation'. It's inevitable that we will create jobs. We can use the transition to 100 percent renewable energy as the vehicle to truly deliver and establish economic, social and racial justice in the United States of America."

I take them at their word.

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