Amplificaiton R&D
This document has notes on amplifier development and a list of off-shelf amps in testing and available to buy and other misc notes.
This doc is mostly related to the improvement of the CX Cards SNR or signal-to-noise ratio.
Tip
Do not use PCBway for less then 5 unit orders, you will pay 3 times more then KoFi for a single built amplifyer.
Order Links: ADA4857 KoFi / ADA4857 PCBway
Developed by Rene Wolf as a second generation, "adjust per unit" impedence matched amplifier board based around using two ADA4857 aplifyer ICs with 0805 pads for gain/input termination so requires an assortment resistor book and a entry to mid range benchtop type digital store oscilloscope.
Full name vhs-rf-amp-ada4857 ADA4857 GitLab Repo.
The most commonly deployed off-shelf RMS amplifier considered the go-to for HiFi/Video FM from tape and laserdisc formats, using 0603 parts it can be user modified if required.
Rene Wolf's first generation amplifier for due duel channel capture using the sgm8302 amplifier IC.
An off shelf board that is widely available on AliExpress.
(Confirmed on LD players)
Used by the DomesDayDuplicator
The way the board is supplied, the 2 channels aren't configured the same.
Absolute gain range programmable −14 dB to +34 dB (FBK shorted to OUT) through 0 dB to 48 dB (FBK open)
One channel has FBK shorted to OUT (-14 to +34) gain range, and the other channel has FBK open (0 to 48db) range, controlled by R5 and R6.
Used by the DomesDayDuplicator
https://www.aliexpress.com/item/33008732817.html
https://www.aliexpress.com/item/32790115607.html
Analog Devices Linear Technology LT1252 Low-Cost Video Amplifier (built for application used by CubeTec's BetaCam add-in boards for example)
- FAQ - Frequently Asked Questions
- Diagram Breakdowns
- Visual-Comparisons
- VCR Reports / RF Tap Examples
- Download & Contribute Data
- Speed Testing
- Visual VBI Data Guide
- Closed Captioning
- Teletext
- WSS Wide - Screen Signalling
- VITC Timecode
- VITS Signals
- XDS Data (PBS)
- Video ID IEC 61880
- Vapoursynth TBC Median Stacking Guide
- Ruxpin-Decode & TV Teddy Tapes
- Tony's GNU Radio For Dummies Guide
- Tony's GNU Radio Scripts
- DomesDay Duplicator Utilities
- ld-decode Utilities