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RF-T-Subtractor.php    5569 Bytes    19-07-2022 07:03:05


Subtractor, aka Differential Amplifier


RF TOOLBOX 3599 EDITION






The assembled prototype




✈ Motivation




This is a Building Block for our Quantum Experimenters. It has turned out, that, unless our Quantum Computer is running at full speed, such Arithmetic Modules still are very useful for some side experiments.

Also a lot of former members ask for such devices - so here it is ...




✈ Functional Description




This is a classical Differential Amplifier, built with Operational Amplifiers. The Input is buffered with an OP37 (Ultralow Offset Voltage Operational Amplifier). It presents an input Impedance of 1 MΩ (Potentiometer) whilst maintaining a low output Impedance.

If more speed is necessary, they mayst be exchanged. We used sockets for all of the DIL-8 circuits. (This also allows for fast repair - just in case :-)

Finally, another OP37 sums up the buffered and scaled input. Its Gain is 0.1 as desired by the initial Lithium Setup.

All Inputs and outputs span a range from - 10 V upt to + 10 V. Speed varies with used OPAMP.




✈ Accessories




• Power Supply, e.g. Leomod
• Lemo Cable, e.g. this or that.




✈ Downloads








✈ Share your thoughts



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t1 = 6586 d

t2 = 188 ms

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