The funny thing is that you can build a superior four-quadrant multiplier from half of a 2164 quad VCA, a couple of opamps, and a few resistors, if you know how. I have featured that multiplier circuit in my frequency shifter module (Freak Shift) and my new dual multiplier module (Delta Quadrant), which has voltage control over the quadrant, from -2 through 4 to +2. In fact, each module involves two such multipliers built from a single 2164 chip and a TL074 quad op-amp, at a total cost of about $4. There is absolutely no need to pay for an AD633 ever again.
Thanks Dr. Sketchy! That's good to know. When i started this project i didn't know the exact voltage ranges my equipment would be using (it involves a variable voltage H-Bridge an a microcontroller DAC) and I couldn't find great specs on standard voltage ranges for Eurorack, so I paid more for flexibility and went with what I knew at the time. If I get lucky enough to mass produce these I should use or adapt your circuit... any links to share? Here is the 2164 datasheet for anyone interested. It has lots of great examples: www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf
I guess the price may have to do with the laser trimmed resistors inside these things. Cost and accuracy seem pretty good for high frequency applications considering these go up to some MHz and even digital multiplication is costly at those rates. At low frequencies they seem expensive but having tried multiplication with the LM13700, accuracy is difficult to achieve and takes ages to design with all the offsets to trim in that solution. Will be buying some of these soon myself and hope they remain available!
They're in curve tracers aren't they. Tektronix bought them all haha. If I order below 120cad I pay almost 50 for shipping and brokerage from digikey so I wait till I have a large order haha. Beats rebranded Chinese crap though. I've been replacing all my components with brand name ones. I spent a fortune on test gear and wondered why half my circuits never behaved when I was learning haha. I'd have never bought a scope so soon either if I had my time over, it led to two, then 3, now 4 haha. I donate the old ones though. I am regretting not buying that Tektronix mdoXXXX second hand now because I'd have a spectrum analyzer for audio. I paid 600 to add the logic analyzer option to my ritol and I've yet to use it. I would've bought differential probes instead to avoiding harm to the front end. There was someone selling 6 active tek probes a few weeks ago for 450 and I'm kicking myself for not buying them for the ability to have hv probes and 4 500mhz x100 ones
![[ $12 ] DIY eurorack modular synth Ring modulator & wavefolder with AD633 analog multiplier](/img/n.gif)
The funny thing is that you can build a superior four-quadrant multiplier from half of a 2164 quad VCA, a couple of opamps, and a few resistors, if you know how. I have featured that multiplier circuit in my frequency shifter module (Freak Shift) and my new dual multiplier module (Delta Quadrant), which has voltage control over the quadrant, from -2 through 4 to +2. In fact, each module involves two such multipliers built from a single 2164 chip and a TL074 quad op-amp, at a total cost of about $4.
There is absolutely no need to pay for an AD633 ever again.
Thanks Dr. Sketchy! That's good to know. When i started this project i didn't know the exact voltage ranges my equipment would be using (it involves a variable voltage H-Bridge an a microcontroller DAC) and I couldn't find great specs on standard voltage ranges for Eurorack, so I paid more for flexibility and went with what I knew at the time. If I get lucky enough to mass produce these I should use or adapt your circuit... any links to share? Here is the 2164 datasheet for anyone interested. It has lots of great examples: www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf
I just got one of these today!
“Let me ground myself on the sink”
*Puts IC on a sheet of paper*
Oh man, great observation... and i didn't even realize paper could exert a static charge! You rock!
@@DIYDSPcaution me din. Haha good call though
I guess the price may have to do with the laser trimmed resistors inside these things. Cost and accuracy seem pretty good for high frequency applications considering these go up to some MHz and even digital multiplication is costly at those rates. At low frequencies they seem expensive but having tried multiplication with the LM13700, accuracy is difficult to achieve and takes ages to design with all the offsets to trim in that solution. Will be buying some of these soon myself and hope they remain available!
I saved my pennies for 2 of these as well, managed to snag them for $13 ea. Making a Lorenz attractor circuit.
How to make Lorentz attractor sir
How to make Lorentz attractor circuit sir
@@isacdaimary9908 I searched for Loren attractor ad633 also look for chaotic circuits
They're in curve tracers aren't they. Tektronix bought them all haha. If I order below 120cad I pay almost 50 for shipping and brokerage from digikey so I wait till I have a large order haha. Beats rebranded Chinese crap though. I've been replacing all my components with brand name ones. I spent a fortune on test gear and wondered why half my circuits never behaved when I was learning haha. I'd have never bought a scope so soon either if I had my time over, it led to two, then 3, now 4 haha. I donate the old ones though. I am regretting not buying that Tektronix mdoXXXX second hand now because I'd have a spectrum analyzer for audio. I paid 600 to add the logic analyzer option to my ritol and I've yet to use it. I would've bought differential probes instead to avoiding harm to the front end. There was someone selling 6 active tek probes a few weeks ago for 450 and I'm kicking myself for not buying them for the ability to have hv probes and 4 500mhz x100 ones