[sdiy] 4069 VCO to get started? My answer

[Nicolai Czempin]

René Schmitz wrote:

>>
>> What puzzled me was not the general idea of an integrator or 
>> Schmitt-Trigger. What did so was that the circuit showed the building 
>> blocks simply as digital inverters. And I was wondering how on earth 
>> an inverter can be one thing in one part of the circuit and another 
>> thing elsewhere.
>> So perhaps to make it clearer the symbol in the schematics could be 
>> changed to reflect the functional usage.
>
> The gates only become integrators or schmitt-triggers by their 
> external components. Just like with OPs. Infact you can think of the 
> gate symbol as a poor mans opamp, which has its + input tied to Vcc/2 
> internally and the only the - input brought out.

I did remember last night that even opamp types are defined by how the 
Cs and Rs are connected, and that the inverter probably has a similar 
function as the inverting input of an op-amp.

But it still doesn't come naturally to me; I'm reading so much stuff, 
and sometimes it takes a while for me to remember, and associate things 
with each other.
It's a lot of fun, though.