Inverter (logic gate)
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In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. It outputs a bit whose value is opposite of the input bit's value. The bit values are typically represented
NPN transistor–transistor logic inverter
Resistor–transistor logic
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Resistor–transistor logic, sometimes also known as transistor–resistor logic, is a class of digital circuits built using resistors as the input network and bipolar junction transistors as switching de
Inverter (logic gate)
…resistance compared to the NMOS-only or PMOS-only type devices. Inverters can also be constructed with bipolar junction transistors (BJT) in either a resistor–transistor logic (RTL) or a transistor–transistor logic (TTL) configuration. Digital electronics circuits operate at fixed voltage levels corresponding to a logical 0…
Photograph of the dual 3-input NOR gate chip used to build the Apollo Guidance Computer. Connections (clockwise from top center) ground, inputs (3), output, power (Vcc), output, inputs (3). The six transistors (two groups of three) are in the center. The thin wires from the terminals to the transistors are resistors.
Flatpack RTL NOR gate integrated circuits in the Apollo Guidance Computer