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PCB for Samuel Groner's low distortion passive notch filter

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#22
1audio said:
I have a question after looking at the schematic. I should have asked when he first posted. Should the resistors in the filter be in a series/parallel network to reduce the signal across them? Same for the caps? I believe there is a direct relationship between the signal level and nonlinearity.
Click to expand...
Re. the caps, connecting them in parallel reduces the total capacitance deviation from the nominal value of the group compared to a single capacitor with the same tolerance (assuming the individual capacitance deviation is a random variable).
Same for resistors in series, but also reduces the load per unit in the chain.


Samuel often employs this technique, see e.g.
Analog Circuit Design · Samuel Groner · Resources · Low Distortion Oscillators


Regards,
Braca
 
#23
sure Daniel, makes sourcing enough parts to end up with the values that work easier. All we have to do is decide on the frequencies we want. 🙂

do I go for 1K on the nose or do I make it to match Victors oscillator, which is almost 1K.

lots of choices, humm, maybe that's why I chose 4 boards.

Cheers
Alan
 
#25
Consolidated list so far

Woo-hoo! We have requests for 47 boards in just two days, and I am placing an order for 50 boards with the manufacturer. Will keep you posted on the progress.

The consolidated list is as follows:
  • slartibartfasst: 3
  • anatech: 3 (tentative)
  • Frex: 2
  • AKN: 4
  • fredbloggstwo: 2
  • hochopeper: 3 (+a PCB for Samuel Groner's Low Noise Laboratory Grade Measurement Amplifier)
  • mlloyd1: 3
  • DPH: 2
  • PH104: 3
  • waltzing bear: 4
  • markus22ch: 4
  • Monte McGuire: 4
  • bricks: 2
  • act: 4
  • CG: 4
 
#27
Absolutely - thank you for joining!

The updated consolidated list:
  • slartibartfasst: 3
  • anatech: 3 (tentative)
  • Frex: 2
  • AKN: 4
  • fredbloggstwo: 2
  • hochopeper: 3 (+a PCB for Samuel Groner's Low Noise Laboratory Grade Measurement Amplifier)
  • mlloyd1: 3
  • DPH: 2
  • PH104: 3
  • waltzingbear: 4
  • markus22ch: 4
  • Monte McGuire: 4
  • brickj: 2
  • acg: 4
  • CG: 4
  • Malvin: 3
The updated total is 50 boards.
 
#38
First batch is ready to ship

All, thank you for patience. The first batch of 50 PCB arrived (see the attached pictures) and is ready to ship. I will be sending you PMs later today confirming the number of PCBs ordered, your shipping addresses, and payment details.

The up-to-date list of GB participants is below. After I ordered the first batch, you requested 20 more PCBs, so there will be a second batch coming in very soon - I will keep you posted.

  1. acg - 4
  2. AKN - 4
  3. anatech - 3 + 1 Groner's LNA PCB
  4. bk856er - 2
  5. brickj - 2
  6. CG - 4
  7. chris719 - 4
  8. dc3 - 2
  9. DPH - 2
  10. fredbloggstwo - 2
  11. Frex - 2
  12. hochopeper - 3 + 1 Groner's LNA PCB
  13. Malvin - 3
  14. markus22ch - 4 + 2 Groner's LNA PCB
  15. mlloyd1 - 3
  16. modmix - 4
  17. Monte McGuire - 4
  18. oyvind - 3
  19. PH104 - 3
  20. Rocko - 2
  21. slartibartfasst - 3
  22. waltzingbear - 4
 

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