On another thread you show diode clamps to ground that kill any signal input. Cmos logic ICs already have diodes to clamp input voltages to one diode drop above the supply voltage and to one diode drop below ground but they are tiny with a low max current rating. Also I mentioned that you probably need a series resistor to limit the current from static electricity.
But remember I am not using CMOS logic chips, rather the HEF/CD ones.
The diode clamp in my case is on the input of an aerial that picks up noise from a tesla coil.
I just wasn't sure whether a diode clamp would give the trace/wire a definite state of GND. I suspected it wouldn't, but I was not sure.
But thinking further, before it reaches my logic gate, the input signal from my aerial passes through two schmitt trigger inverters. So this would give it a definite state before it reaches the input of my logic gate.
But I will keep my two 560k resistors for testing purposes - I doubt they will have any effect on the output of the schmitt triggers.
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On another thread you show diode clamps to ground that kill any signal input. Cmos logic ICs already have diodes to clamp input voltages to one diode drop above the supply voltage and to one diode drop below ground but they are tiny with a low max current rating. Also I mentioned that you probably need a series resistor to limit the current from static electricity.
I am confused AudioGuru.
I thought that CMOS chips were all 5-7V Vcc.
Jaycar have CD4081BC listed on their website:
https://www.jaycar.com.au/medias/ZC4081-dataSheetMain?context=bWFzdGVyfGltYWdlc3w5OTA1OXxhcHBsaWNhdGlvbi9wZGZ8aW1hZ2VzL2hkOC9oZmUvODgzMjIxOTYxMTE2Ni5wZGZ8YTg4NTM2YWJhOTkxZDJmMzk2NTc3NTQ2NWIwMjRkNjZjNTVhMWM0MjBmMzg1NzkyZjQ4MjIwMjk0NGFlNDY5OA
This clearly says that 4081 is CMOS.
But what I actually bought was NXP HEF4081 - presumably it is equivalent to Fairchild CD4081.
But the datasheet for this does not state that it is CMOS,
You are telling me that HEF4081 and CD4081 are just manufacturer names for the same device.
So I don't really know what I have! A CMOS or TTL chip?
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Here audioguru, by looking in the CMOS section of Multim 12 database I found the actual logic chips that I am using in my real circuit.
There being 15V, 10V and 5V versions of CMOS....which I did not know about. And the NXP datasheet I have also mentions 15V, 10V and 5V versions although I did not notice the word CMOS any where in the document.
So this makes it some what easier to get my TIP base resistors right.