Pi Attenuator board build with JLCPCB

Описание: #diyelectronics #diyaudio PCB Prototype for $2 (Any Color ): https://jlcpcb.com/

The boards for the attenuator project arrived and I was anxious to build it up and test it.
A careful selection of attenuation steps will allow me to settle for four switchable levels, which will make the unit more compact. Always a good thing.
Online calculators now exist for practically everything, and Pi Attenuator resistor calculators are no exception. The same applies for calculating the equivalent resistance of multiple resistors in parallel, which are used here.
The final stage is defining the required refinements for version 2. I’ve identified a few:
1. Adding pads for 3 resistors for every resistor position to facilitate achieving more exact R values;
2. Making holes and pads for the IN/OUT connect points bigger;
3. Changing the orientation of the “leg” resistors to bring their ground points closer to the signal path;
4. Adding many more vias between ground planes to reduce noise and improve linearity;
5. Connecting the chassis to the ground to make the shielding properties of the front panel effective;
6. Changing the ‘last’ stage to 24dB, making it even more selectable;
7. Changing the blocking capacitors to through-hole 630v caps, to safeguard against any HV anomaly getting back into the signal generator. The smd ones are lower rating.
... and there’ll be more, I’m sure.
It wouldn't be fun if you did it perfectly right the first time, would it? I wouldn't know - never happens to me.

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