Four quadrant multiplier

[dbanner]

I see X and Y inputs. I wonder if this circuit can be the basis of some crude and simple VDI. Maybe just to give an indication of Ferrous/Non ferrous when in all metal mode. Like a visual two tone.

[bklein]

Check electronic music circuits to see more approaches to this.

[dbanner]

If one were to connect x y to the sbg-pid circuit where the discrimination pot connects, for example, then put a comparator on the output of circuit to drive an LED for ferrous Target.
I wonder if that would work, of course there would need to be some mods to circuit. But as a concept, I wonder.

[Carl-NC]

Check electronic music circuits to see more approaches to this.

Y'know, I took a look at your book online and saw some really interesting stuff. So I went looking for a hard copy. Holy Smokes, the going rate is $150 used! Why not throw the thing on Amazon publishing for $30 and make some extra money?

[dbanner]

Which book? I mean what's the title.

[dbanner]

Well my gosh, it's "Electronic Music Circuits "
You should have capitalised. I should have been smarter.

[dbanner]

Barry, errh, your book is in a PDF available online for free. What's going on here?
Why don't you take action. That looks like a really well done book.

[dbanner]

Wow, what a fantastic book. Tonnes of circuits and information. Just browsing through using the online viewer.
That is a valuable piece of published work.

[dbanner]

Now I remember. It was you who wrote on another thread that someone put your book as pdf on some archive site.

[moorejl57]

Took a peek at the book online as well and it reminded me of when I had an ARP Odyssey back in '83 that I bought off my musician roommate. I spent many fun hours playing with that thing.

[dbanner]

Yeah, the vintage stuff is so cool, and VALUABLE too. Wish I kept my Sony Walkman from 1980.
Sony made 200 million Walkmans before stopping production in 2010. But the first ones from the very start are highly collectible. I threw mine out back in the eighties without so much as a sniffle along with a lot of other stuff. Wish I had kept those old vacuum tube amps. I threw them all away because they were almost worthless at the time.

[dbanner]

Edited

[dbanner]

Just recently I saw on eBay, a Lafayette stereo tube amplifier which sold for over 1000usd, I used mine as a floor stool to sit on, when I needed tovwirk on stuff low to the ground. Threw it on the dump in 1984. The thing weighed a ton. Thinking it was too heavy to keep moving from apartment to apartment.
Misery I tell you.

[dbanner]

Seriously, if I had kept all the things that I had way back when, I would have been sitting on a throne today.

[ivconic]

Check electronic music circuits to see more approaches to this.

Cool book!
I wish i had it few decades earlier...
You've been with Music Man!
Cool!
Part of my hobby was always such stuff.
Recently i "messed up" with Moog.
What a vintage!
Touching those keys... what a feeling!