On an ARP Odyssey synthesizer ( and a few others from that era as well ) the ring modulator is an four NAND gates ) fed from the square wave outputs of the two oscillators.
32.
In principle any method that leads to a gate that is functionally complete ( for example, either a NOR or a NAND gate ) can be used to make any kind of digital logic circuit.
33.
However, the problem with " Castlevania III " can be corrected on some models of the FC Twin by adding a 7404 inverter or 7400 NAND Gate to modify an A13 signal from the cartridge slot.
34.
Older TTL parts made by manufacturers such as Signetics, Motorola, Mullard and Siemens may have different numeric prefix and numbering series entirely, such as in the European FJ family FJH101 is an 8-input NAND gate like a 7430.
35.
The logical effort of a two-input NAND gate is calculated to be " g " = 4 / 3 because a NAND gate with input capacitance 4 can drive the same current as the inverter can, with input capacitance 3.
36.
The logical effort of a two-input NAND gate is calculated to be " g " = 4 / 3 because a NAND gate with input capacitance 4 can drive the same current as the inverter can, with input capacitance 3.
37.
Unfortunately the serial number does not specify the same type of gate in each family, e . g . while an FJH131 is a quadruple 2-input NAND gate ( like the 7400 ), an FCH131 is a dual 4-input NAND gate.
38.
Unfortunately the serial number does not specify the same type of gate in each family, e . g . while an FJH131 is a quadruple 2-input NAND gate ( like the 7400 ), an FCH131 is a dual 4-input NAND gate.
39.
Note that the use of 3-state logic for bus systems is not needed, and can be replaced by digital multiplexers, which can be built using only simple logic gates ( such as NAND gates, NOR gates, or AND and OR gates ).
40.
If the four NAND gates, below, are replaced by NOR gates, this results in an XNOR gate, which can be converted to an XOR gate by inverting the output or one of the inputs ( e . g . with a fifth NOR gate ).
