This is a Building Block for our Quantum Experimenters. It turned out, that even such simple building blocks are quite handy, when having them on stock. The gain can quickly be adjusted by the change of two resistors. You can find a suiteable calculator here.

As we use a socket for the OPAMP, this mayst also be turned into a gain / phase measurement setup to characterise operational amplifiers using a suiteable python script and a picoscope.

This is a classical amplifier with an operational amplifier in its simpliest form. The input is tight to GND with a pull-down resistor (100 kΩ), this also defines the input impedance.

The OPAMP has an additional output resistor of 47 Ω, this will result in a total output impedance of roughly 50 Ω. This is absolutely not needed, as we are dealing with DC / AF, but it acts as a protection, in case the output gets shorted.

If more speed is necessary, the OPAMP mayst be exchanged. We used a socket (DIL-8). This also allows for fast repair - just in case. Faster types would be e.g. OP27 or OP37.

All inputs and outputs span a range of ±10 V. Speed varies with used OPAMP and selected gain. Please do not only consider the gain-badwidth product, but also the slewrate, which sometimes can limit your application.

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

MC1741, Vu = 2, -3 dB @ 182.5 kHz



OP07, Vu = 2, -3 dB @ 50.1 kHz



Measured with the BODE100.

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