noise margin
3.The circuits 4-Value TTL NOT gate and NAND gate, which designed using bipolar transistor, have better I/O character, stronger energy of load and noise immunity, their noise margin may reach ±0.6 V. Especially, the circuit of NAND gate my be totally made by NPN transistor, and the circuit structure is simple, easily is complicated by Integrate Circuit.
4.If I cannot catch ”the sound of noise of rain”(1 Kings 18:41 margin) long befor the rain falls, and, going to some hilltop of the spirit, as near to my God as I can, have not faith to wait there with my face between my knees, though six times or sixty times I am told ”there is nothing,” till at last ”there arises a little cloud out of the sea”, then I know nothing of Calvary love.
