Audio Level Indicator . Log DB LM3915 fed by LF353 for S-meter?

I've also discovered an audio level indicator recently: https://www.aliexpress.us/item/2251832501435636.html
&
https://www.mouser.com/datasheet/2/405/lm3915-443929.pdf
& https://www.ti.com/lit/ds/symlink/lf353-n.pdf
https://www.youtube.com/watch?v=jllsqRWhjGM (EEVblog #490 - Peak Detector Circuit --- feed to lm3915 for led bar display  (s-meter))
use caps with low dielectric adsorption: http://danssmallpartsandkits.net/ (polystyrene caps)
https://www.youtube.com/watch?v=Fn5kHhNRsz0 (#77: Op Amp Peak Detector Tutorial, with peak detector basics)Why?
http://www.ozqrp.com/docs/MST3_manual_V1.pdf (mostly analog radio)
-->    http://www.ozqrp.com/docs/LED_S_meter_manual_V1_0.pdf (S-Meter)

My mind also wandered to the digital to signal processing realm:
https://www.analog.com/media/en/technical-documentation/data-sheets/ad9226.pdf (Analog to Digital)
https://wiki.sipeed.com/hardware/en/tang/Tang-Nano-9K/Nano-9K.html (Digital Signal Processing)
https://www.analog.com/media/en/technical-documentation/data-sheets/2604fd.pdf (Digital to Analog) --- to 50MhZ
https://www.youtube.com/watch?v=ZZJekllYUVc (R2R resistor ladder to 25MHz)ADC w/ FPGA (https://www.youtube.com/watch?v=cvdzEQhLpYw)
VLSI Project || DAC( Digital to Analog Converter) interfacing with FPGA using SPI || SPARTAN 3E (https://www.youtube.com/watch?v=CPGX-Kdvx9s)

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Addendum:
https://www.elprocus.com/analog-to-digital-converter/

Oddly I found myself thinking about FPGAs, here are my findings... (tldr....you can try obtaining ZKP BLS12_381 curves)

This was some bantering also published here: (https://lists.w3.org/Archives/Public/public-credentials/2022Sep/0180.html).

As I was studying for my HAM radio general exam, my brain wondered. I thought about digital filtering, which led me to https://www.youtube.com/watch?v=HJ-C4Incgpw (How to design and implement a digital low-pass filter on an Arduino).
Realizing the limitations of this I soon found myself on https://www.youtube.com/watch?v=vVjWFFclU6I (Implementing Digital Signal Processing on the FPGA of a FlexRIO).

Naturally the next morning this led to exploration of https://identity.foundation/bbs-signature/draft-looker-cfrg-bbs-signatures.html#name-bls12-381-ciphersuites and discovery of
https://www.youtube.com/watch?v=vCG5_nxm2G4 (MeganWachs - Keynote RISC-V and FPGAs: Open Source Hardware Hacking) which led to https://github.com/riscv/riscv-crypto and
https://riscv.org/wp-content/uploads/2017/12/Wed-1354-RISCV-CryptoExtensions-RichardNewell.pdf and https://www.youtube.com/watch?v=-HVRjbxWF-I (A Guide to the RISC V Cryptography Extension).

I also found bls12_381 on an FPGA: https://dspace.mit.edu/bitstream/handle/1721.1/138122/Paper_PrePrint_Version.pdf (done on an in-house FPGA)

This bls12_381 on FPGAs also led to discovery of work by the ZCash Foundation: https://github.com/ZcashFoundation/zcash-fpga/tree/master/zcash_fpga/src/rtl/bls12_381 . Apparently this was done on AWS FPGAs.

I discovered the Tang Nano 9K FPGA Development Board GOWIN GW1NR-9 RISC-V HDMI kit . Realizing they were inexpensive, I grabbed two imagining IIW. I also recalled my time at the

Virtual Silicon Salon (https://www.siliconsalon.info/) and remembered that hardware was slow, and

IIRC BLS signatures used for selective disclosure are not yet available in hardware.

I've never worked with FPGAs before. I discovered what I found is like the Ice40 (unfortunately hard to find at the moment), but it did lead me to some good resources.

ice40 playlist:
https://www.youtube.com/watch?v=DwxBkYhor80
https://www.youtube.com/watch?v=UlgJ7TRU1KI
https://www.youtube.com/watch?v=6UgVUExXlvg
https://www.youtube.com/watch?v=dTL0qrzme4
(I found that this was still available, later in exploration: https://tinyvision.ai/) --- ditto for tinyFPGA (https://tinyfpga.com/)


Tang Nano from Gowin Semi:
https://github.com/gowinsemi  (Github)
https://www.youtube.com/channel/UC0VdsHXVKAaMkFVyBzVLVIQ (YouTube)
https://wiki.sipeed.com/hardware/en/tang/Tang-Nano-9K/Nano-9K.html (Wiki)
https://www.youtube.com/watch?v=WKB04zxLrHA (Tang Nano 9k)
https://www.youtube.com/watch?v=kyQLtBh6h0U (FPT2020: A Complete Open Source Design Flow for Gowin FPGAs)
https://www.youtube.com/watch?v=Gh9VfCvTWck (2nd Open Source video, possibly building on the former)
https://www.bananatronics.org/first-steps-with-the-tang-nano-fpga-development-board/
https://www.cnx-software.com/2022/01/17/tang-nano-9k-fpga-board-can-emulate-picorv32-risc-v-soft-core-with-all-peripherals/

General FPGA links:
https://www-electronicayciencia-com.translate.goog/2021/07/tang_nano_fpga.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
https://www.youtube.com/watch?v=gUsHwi4M4xE (EEVblog#496 What is an FPGA?)
https://fpgatutorial.com/getting-started-with-fpga-development-process/
https://www.fpga4student.com/p/verilog-project.html
https://github.com/BrunoLevy/learn-fpga

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Addendum:
https://medium.com/asecuritysite-when-bob-met-alice/explaining-bls12-381-the-zero-knowledge-proof-curve-aa5eabec8261

https://www.youtube.com/watch?app=desktop&v=sOKJWAnrbHM (ARM with FPGA)