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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
The anode of the diode will produce a TTL logic high (because a disconnected TTL input floats up to a logic high) but not a TTL logic low (because it can't go low enough).
It will produce a Cmos logic low but not a Cmos logic high (because a disconnected Cmos input floats all over the place).
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