Electronics > Projects, Designs, and Technical Stuff
Poor mans analog multiplier
Honk:
Hello GK
I'm admiring your Poor Mans Analog Multiplier and could use this as simple Wattage calculator.
But I have a few questions if you don't mind?
1) Can this Circuit multiply Two DC voltage inputs to a multiplied DC voltage output?
2) Could you post a sharper image of the schematic as some of the values is very hard to read?
It's numbers 5 and 6 that looks precisely the same even when magnified.
I know this is an old topic yet very interesting.
BrianHG:
I wonder how good 2 of these in parallel will work as DAC-DC controlled volume controls for line level audio.
tecman:
Temperature drift can be a killer. Thermally bonding devices can help, but never as good as a monolythic solution.
paul
aladan:
Hi Glenn/others,
Using MC1496s as this circuit does is great for cost-effectiveness, but unfortunately the LT1634-5 voltage reference costs as much the three MC1496s put together!
Is there a convenient alternative? For my needs I could live with a little less precision and some slightly sloppy outcomes.
I plan to build two of these in one device - could I somehow share the one LT1634-5 between the two of them? I can't see how I might do that, since it's not just a simple reference voltage, but instead is integral in the circuit.
I am only a relative newbie, and I confess I don't have a full appreciation for the subtleties of exactly how this circuit works. I am hoping someone might be able to at least point me in the right direction to experiment and learn more.
Thank you,
Adrian
RoGeorge:
Either a Gilbert Cell, or maybe a RoGeorge Cell :)
https://hackaday.io/project/7542-rogeorge-cell
Block diagram
Schematic diagram
Vin (blue) and Vout (magenta)
The blue trace is the input signal, and the magenta trace is the output of the four quadrant multiplier (here, the Vout is the Vin variable multiplied and animated between +1 and -1)
Later edit:
Replaced the pics from the now discontinued tinypic.com with pics hosted locally.
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