Harry Munday

UNITED KINGDOM • + Follow

Reece Dodge

UNITED STATES OF AMERICA
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- 0
Engineer

UNITED STATES OF AMERICA
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- 0
2

Tools, APP Software Used etc.

KiCAD

Kicad

Description

ADA4857 Amplifyer

The duel ADA4857 based amplifyer is built to take the 12-13v power rail commonly found inside VCRs.

Deployment of amplifyers requires matching your impedence of your amplifyer, direct head amp taps are ideal for most VCRs in this case, then simply copy the resistance values in the path of your HiFi & Video RF signal paths.

Checklist:

Multimeater to inspect VCRs voltages
Soldering iron (Bevel/Chisel tips)
Solder Paste & or Flux + 60/40 Solder
22AGW Cable
0805 1% Resistor Parts Book

Optional:

12v battery (not critical but can allow you to verify if your deck has high noise from its power supply.
A Digital Store Ossiliscopoe (DHO804 or more affordable equivlent messuremnt tools equiped scope)

Adjust Resistors

Basic Adjustment Guide

Then adjust the input resistance vlaues

R13 & R14 - Path A

R23 & R14 - Path B

And adjust the gain level

Path A

Rf = R14

Rin = R13

Path B

Rf = R24

Rin = R23

Schematic and Layout

ADA4857 Amp Repo

https://gitlab.com/wolfre/vhs-rf-amp-ada4857/

Download BOM(Bill of materials)

May 21,2024

4,112 views

ADA4857 Amplifyer

A proper clean amplifyed and correctly impedence matched input and output is critical for a perfect FM RF archival workflow.

4112

10.00 (1)

Published: May 21,2024

Standard PCB

BOM(Bill of materials)

Centroid file

PCBWay Donate 10% cost To Author

File Last Updated: 2024/05/22 (GMT+8)

File update record

2024-05-2205:06:54

Centroid file is updated.

2024-05-2205:06:54

Parts List (BOM) is updated.

2024-05-2205:06:54

Gerber file is updated.

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