Today, there is a severe lack of documentation

And most of the old circuits are being replaced by IC's, which are essentially turning components into black boxes...

 

It was used a lot in the 70's in commercial two way.... police, fire, business.

 

And most of the old circuits are being replaced by IC's, which are essentially turning components into black boxes...

 

My kid wants to buy my this t-shirt:

View attachment 117601​

Thing is, I myself don't even know what it is! I see a transformer on the left, with an inductor connected to its center tap, then a halfwave rectifier... and on the right, a biased bipolar transistor with its gate decopuled by a cap... but what is the darn thing supposed to do? Or is it just useless gibberish?

Foster-Seeley discriminator

 

My kid wants to buy my this t-shirt:

View attachment 117601​

Thing is, I myself don't even know what it is! I see a transformer on the left, with an inductor connected to its center tap, then a halfwave rectifier... and on the right, a biased bipolar transistor with its gate decopuled by a cap... but what is the darn thing supposed to do? Or is it just useless gibberish?

He can get me one too.

 

Foster-Seeley Discriminator



Ratio-Discriminator



The output is the tell. The circuit in post 1 does not have the tuning capacitor on the secondary of the transformer.

 

A visit to the dictionary is in order.

How embarrassing. I got the circuit but did not get the joke.

 

How embarrassing. I got the circuit but did not get the joke.

I don't think we're sure there actually is a joke.

 

I don't think we're sure there actually is a joke.

I think the "joke" is to read the name of the circuit into the sentence as @JoeJester implied.

 

What part of .... ratio detector with a paraphase amplifier ... don't you understand?
What part of .... ratio discriminator with a paraphase amplifier ... don't you understand?
What part of .... ratio detector with a phase splitter ... don't you understand?
What part of .... ratio discriminator with a phase splitter ... don't you understand?

or they only recognize it as a FM device ....

What part of ... FM detector ... don't you understand?
What part of ... FM discriminator and whatever the hell that last transistor does ... don't you understand?

I don't think of any joke using that schematic. The "I only give positive feedback." is a good play on the circuit. However, without the words, it'd wouldn't be humor.

Here's some humor ....

It might help some establish the relationship.

That t-shirt didn't establish a relationship. The "positive feedback" established a relationship.

 

View attachment 117783

Took me a while.

 

Took me a while.

I saw it right away...

 

And since the humor was readily available, you would place that relationship in the more retentive area of your brain, driven by the emotional response to the stimuli.

But what do I know, other than the empirical data demonstrating the retentive of information that is associated with an emotional response.

 

I saw it right away...

Check in when you have been out of school as long as I.

 

Check in when you have been out of school as long as I.

I got it pretty quick ... being 62 years old.

 

I got it pretty quick ... being 62 years old.

OK it did not take me for ever now. Maybe a minute or so. And math was never my strong suit.

 

No problem. @spinnaker I tried to find @cmartinez shirt online, but couldn't. I did find images of lots of "what part of ....... do you not understand?" shirts.

 

No problem. @spinnaker I tried to find @cmartinez shirt online, but couldn't. I did find images of lots of "what part of ....... do you not understand?" shirts.

Check GopherT 's post #14

 

I saw it right away...

I get that one instantly. Still wondering about the shirt.

 

Still wondering about the shirt.

I will spoil it.

What part of discrimination don't you understand?